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HomeMy WebLinkAbout2008-09-23; Municipal Water District; 667; Approval of Agreement for Recycled Water Services between Vallecitos Water District and Carlsbad Municipal Water District CMWDCARLSBAD MUNICIPAL WATER DISTRICT AGENDA BILL 12 AB# 667 MTG. 9/23/08 DEPT. ENG APPROVAL OF AGREEMENT FOR RECYCLED WATER SERVICE BETWEEN VALLECITOS WATER DISTRICT AND PARI QRAn Ml IMIPIDAI \A/ATCD RICTDI/^T DEPT. HEAD V^-flT CITYATTY. "^(5^ CITY MGR. \J^~^ RECOMMENDED ACTION: Adopt Resolution No.1338 approving the agreement for Recycled Water Service between Vallecitos Water District (VWD) and the Carlsbad Municipal Water District (CMWD). ITEM EXPLANATION: VWD desires to provide recycled water to irrigation customers within their service area that are also within the City of Carlsbad. This service area is generally located along Rancho Santa Fe Road between Melrose Drive and Avenida Soledad (refer to Exhibit 1). Developers in this area have installed irrigation systems in compliance with California Department of Health Services requirements. Through CMWD's recently completed recycled water distribution system, recycled water can be supplied to these irrigation customers. An agreement to provide recycled water to VWD irrigation customers has been prepared and on September 3, 2008, the agreement was approved by the Board of the Vallecitos Water District. Following is a summary of the basic conditions in the agreement: • Vallecitos Water District agrees to allow these customers to be served recycled water by CMWD. • All recycled water will meet federal, state, and local discharge requirements which shall include generally adopted requirements for CMWD as approved by the Regional Water Quality Control Board, San Diego Region. • CMWD shall operate and maintain its recycled water system. • Service connections on VWD's transmission main shall be the responsibility of CMWD, and CMWD is allowed to operate VWD's transmission main valves in an emergency. • Recycled water service connections shall meet the requirements of CMWD's Ordinance No. 43. • CMWD will read all recycled water meters, provide billing to these customers at CMWD's adopted rate, and receive all payments for recycled water service. • The term of the agreement shall run concurrent with the term of the "Agreement for Sale of Reclaimed Water and Use of Mahr Reservoir", dated August 20, 2003 between VWD and CMWD which was approved by the CMWD Board under Resolution No. 1198. DEPARTMENT CONTACT: William Plummer, (760) 602-2768, bplum@ci.carlsbad.ca.us FOR CITY CLERKS USE ONLY. COUNCIL/BOARD ACTION: APPROVED DENIED CONTINUED WITHDRAWN AMENDED D D D D CONTINUED TO DATE SPECIFIC D CONTINUED TO DATE UNKNOWN D RETURNED TO STAFF D OTHER-SEE MINUTES D Page 2 ENVIRONMENTAL IMPACT: The recycled water service area contained in the agreement was included in CMWD's Phase II Mitigated Negative Declaration approved on January 29, 2000 under Case No. EIA 99-09 (CEQA) and also under the National Environmental Policy Act (NEPA) by the United States Department of the Interior on March 1, 2002. FISCAL IMPACT: The recycled water service lines and irrigation lines have been installed by developers of properties within the VWD service area at no cost to CMWD and were inspected by San Diego County Department of Environmental Health and City of Carlsbad's Cross Connection Control Specialist. CMWD will provide billing to each customer and receive payment for supply of recycled water to each customer. Periodic cross connection testing of these irrigation customers will be performed by Carlsbad. EXHIBITS: 1. Location Map. 2. Resolution No. 1338 approving the agreement for Recycled Water Service between Vallecitos Water District and Carlsbad Municipal Water District. 3. Agreement for Recycled Water Service Between the Vallecitos Water District and the Carlsbad Municipal Water District. Z?T Legend • Recycled Water Meter Recycled Service Line Meter •)i NC VALVE Pump Station Reservoir Recycled water main by Agency CMWD PIPE VWD PIPE BBBBI OMWD PIPE •— •» City Boundary VALLECITOS AREA SERVED BY CMWD VWD/CMWD METER MEADOWLARK WATER RECLAMATION FACILITY (VALLECITOS WATER DISTRICT) /' fet. 7 / v MAHR RESERVOIR VALLECITOS WATER DISTRICT EXHIBIT 1 - EXTENT OF CMWD'S RECYCLED WATER SYSTEM WITHIN VALLECITOS WATER DISTRICT | VWD/OMWD METER «** DATE: 08/12/2008 NAME: LRosu/Arome FILE: J:\GIS\Engineering\GIS_ProjectsWcviewProjects-LR\Plummer'2 1 2 RESOLUTION NO. 1338 3 A RESOLUTION OF THE BOARD OF DIRECTORS OF CARLSBAD MUNICIPAL WATER DISTRICT (CMWD), APPROVING 4 AGREEMENT FOR RECYCLED WATER SERVICE BETWEEN VALLECITOS WATER DISTRICT (VWD) AND THE CARLSBAD MUNICIPAL WATER DISTRICT. WHEREAS, Vallecitos Water District desires to provide recycled water within its service6 area to irrigation customers which are also within the City of Carlsbad; and WHEREAS, the Carlsbad Municipal Water District included this portion of the Vallecitoso Water District service area within its Encina Basin Water Reclamation Program, Phase II Project in establishing recycled water demand and performing environmental review in compliance with California Environmental Quality Act (CEQA); and WHEREAS, an agreement has been prepared to allow CMWD to provide recycled water A 2 service to VWD irrigation customers, which was approved by the Board of VWD on September 3, 14 2008. 15 16 NOW, THEREFORE, BE IT RESOLVED by the Carlsbad Municipal Water District Board, 17 as follows: 1. That the above recitations are true and correct. 19 2. That the President is authorized to execute the Agreement for Recycled Water 20 Service Between the Vallecitos Water District and the Carlsbad Municipal Water District referred to 21 herein. 22 /// 23 24 25 26 27 28 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 PASSED, APPROVED AND ADOPTED at a Special Meeting of the Carlsbad Municipal Water District held on the 23rd day of September, 2008, by the following vote to wit: AYES: Board Members Lewis, Kulchin, Hall, Packard and Nygaard. NOES: None. ABSENT: None. ATTEST: s^CAPAi ifc.% UKRAINE M ' J^EAL) , Secretary •is AGREEMENT FOR RECYCLED WATER SERVICE BETWEEN THE VALLECITOS WATER DISTRICT AND THE CARLSBAD MUNICIPAL WATER DISTRICT THIS AGREEMENT for Recycled Water Service, dated as of September 2008 ("Agreement") is made and entered into by and between the VALLECITOS WATER DISTRICT ("VALLECITOS"), a public agency organized and existing pursuant to the County Water District Law, California Water Code Section 30000 et. seq., and the CARLSBAD MUNICIPAL WATER DISTRICT ("CARLSBAD"), a public agency organized under the Municipal Water Act of 1911, and a subsidiary District to the City of CARLSBAD organized and existing pursuant to Water Code Section 71000 et. seq. (collectively, the "Parties"). RECITALS A. VALLECITOS and CARLSBAD both have the legal authority to provide potable water and recycled water service to customers within their respective service areas. B. CARLSBAD and VALLECITOS have overlapping recycled water service areas as shown on the attached Exhibit "A", with potable water service being provided by VALLECITOS in the overlapping areas. CARLSBAD has recycled water pipelines within a portion of VALLECITOS that can be used to deliver recycled water for irrigation purposes within the VALLECITOS service area. C. CARLSBAD has adopted Ordinance No. 43 requiring the use of recycled water within its service area wherever it has determined that its use is economically justified, financially and technically feasible, and consistent with legal requirements, preservation of public health, safety and welfare, and the environment. D. Through the Agreement to Purchase Reclaimed Water dated August 20, 2003, ("RECLAIMED WATER AGREEMENT") between the Parties, VALLECITOS has agreed to provide up to 3.0 million gallons per day (mgd) of recycled water from the Meadowlark Water Reclamation Facility to CARLSBAD'S recycled water system, referred to as the "Encina Basin Water Reclamation Program". E. By this Agreement, VALLECITOS desires to provide recycled water within its service area including that portion of the VALLECITOS service area within the City of CARLSBAD, and CARLSBAD is willing to provide recycled water to VALLECITOS customers within the VALLECITOS service area at retail rates in accordance with the terms and conditions of this Agreement. (D COVENENTS NOW, THEREFORE, it is agreed by and between the parties as follows: SECTION 1. Recycled Water Delivery Area. VALLECITOS and CARLSBAD have determined that some VALLECITOS customers, located along Rancho Santa Fe Road in Carlsbad, California can be served recycled water from CARLSBAD'S recycled water system, by connection to VALLECITOS' "Recycled Water Transmission Main" located in Rancho Santa Fe Road. VALLECITOS agrees to allow these customers to be served recycled water by CARLSBAD. The recycled water customers shall be limited to that portion of the VALLECITOS service area within the City of Carlsbad, as shown on the attached Exhibit "A". SECTION 2. Discharge Standards. All recycled water supplied by CARLSBAD to the customers in the VALLECITOS service area shall meet federal, state, and local discharge requirements, which shall include all generally adopted requirements for CARLSBAD as approved by the Regional Water Quality Control Board, San Diego Region. SECTION 3. Operation and Maintenance of Facilities. CARLSBAD shall be responsible for operating and maintaining its recycled water system, including pipelines, meters, service lines, and corporation valves in a state of repair and condition that will meet the standards referenced in the above Section 2 of this Agreement. These facilities also include pipelines, meters, service lines, and corporation valves connected to VALLECITOS' "Recycled Water Transmission Main" located in Rancho Santa Fe Road as shown on Exhibit "A", and CARLSBAD'S recycled water pipelines connected to VALLECITOS' "Recycled Water Transmission Main" intended for local distribution of recycled water by CARLSBAD. The point of connection to VALLECITOS' "Recycled Water Transmission Main", including the branch valve shall be owned and maintained by VALLECITOS with the provision that VALLECITOS shall provide CARLSBAD notice within 24 hours of any adjustment or operation of the branch valve(s) by VALLECITOS, excluding emergencies. In an emergency such as a pipeline break CARLSBAD shall be permitted to close the branch valve(s) to make necessary repairs to its recycled water system. CARLSBAD shall notify VALLECITOS as soon as possible regarding operation of the valve(s). CARLSBAD shall be responsible for any damages caused by their operation of the branch valve(s). SECTION 4. Recycled Water Customer Requirements. Recycled water service to customers shall meet the requirements of CARLSBAD'S Ordinance No. 43, California State Department of Health Services requirements, which requires the need to perform annual walk-through inspections on every site by CARLSBAD and Order No. 2001-352 "Master Reclamation Permit with Waste Discharge Requirements for the Production and Purveyance of Recycled Water", adopted by the California Regional Water Quality Control Board, San Diego Region and amendments thereto. Also, depending on site characteristics there may be either a "no shut-down test" required, an annual "shut- down test" or a "shut down test" performed once every four years. VALLECITOS will cooperate with CARLSBAD to establish a mutual agreeable time to perform the required shutdown tests. The shut-down tests will require shutting off potable water supplies to 7 some potable water customers during the test time period not to exceed 24 hours, except that the test time period for residential customers shall not exceed 12 hours. VALLECITOS shall provide contact information to CARLSBAD of potable water customers impacted by the testing. CARLSBAD shall provide a fourteen day advance notice to recycled water and potable water customers, and to VALLECITOS regarding any shut-down testing to be performed. SECTION 5. Billing and Rates. It shall be CARLSBAD'S responsibility to read the recycled water meters of customers within the service area described herein and to provide the billing for the customers based on CARLSBAD'S adopted retail recycled water rates in affect at the time of the billing and to collect the billing from the recycled water customer. SECTION 6. Term of Agreement. This Agreement shall be effective as of the date first above written, and shall run concurrent with the term of the RECLAIMED WATER AGREEMENT. In the event the RECLAIMED WATER AGREEMENT terminates for any reason, this Agreement shall also terminate with the understanding that CARLSBAD will continue to provide recycled water to the customers identified in Section 1 above until either a new agreement has been entered into between VALLECITOS and CARLSBAD to continue recycled water delivery to these customers by CARLSBAD, or VALLECITOS has made the necessary modifications, and improvements required to supply water to these customers. VALLECITOS agrees to provide written notification to CARLSBAD that it is ready to supply water to the customers beginning on a date to be specified by VALLECITOS. The parties shall cooperate in transferring customers from CARLSBAD to VALLECITOS including coordination of all notices, and transfer of customer accounts. Construction costs incurred by CARLSBAD for new capital improvements, within the service area (Exhibit "A"), required to provide recycled water to VALLECITOS customers from the date of this Agreement shall be reimbursed by VALLECITOS (20 year depreciation) if VALLECITOS terminates the August 20, 2003 Agreement without cause. CARLSBAD shall provide documentation to VALLECITOS on an annual basis of any new capital improvements. SECTION 7. Miscellaneous Provisions. 7.1 Venue. In the event of any legal or equitable proceeding to enforce or interpret the terms or conditions of this Agreement, the parties agree that venue shall lie only in the Federal or State courts in or nearest to the North County Judicial District, County of San Diego, State of California. 7.2 Modification. This Agreement may not be altered in whole or in part except by a modification, in writing, executed by all the parties to this Agreement. 7.3 Incorporation of Agreement to Purchase Reclaimed Water. A copy of the Agreement to Purchase Reclaimed Water dated August 20, 2003, is attached hereto as Exhibit "B" and incorporated herein by reference. 7.4 Entire Agreement. This Agreement, together with all the exhibits attached to this Agreement, contains all representations and the entire understanding between the parties with respect to the limited subject matter of this Agreement. This Agreement shall not modify or supersede the RECLAIMED WATER AGREEMENT. "VALLECITOS" VALLECITOS WATER DISTRICT By: "CARLSBAD" timothy M/Shell, President CARLS UNICIPAAWATER Dl ATTEST: WILLIAM W. RUCKER, Secretary Board of Directors ATTEST: A/6°RRAIN$ M. WOOD /City Clerk APPROVED AS TO FORM: JEFFREY G. SCOTT, Legal Counsel RONALD R. BALL, City Attorney By:' &*- EXHIBIT "A" MAP OF CARLSBAD MUNICIPAL WATER DISTRICT'S RECYCLED WATER SERVICE AREA WITHIN VALLECITOS WATER DISTRICT Legend • Recycled Water Meter ^—^— Recycled Service Line Meter NC VALVE Pump Station Reservoir Recycled water main by Agency —• CMWD PIPE • • VWD PIPE OMWD PIPE •—•• City Boundary VALLECITOS AREA SERVED BY CMWD VWD/CMWD METER SAN ELIJO RD MEADOWLARK WATER RECLAMATION FACILITY (VALLECITOS WATER DISTRICT) MAHR RESERVOIR VALLECITOS WATER DISTRICT VWD/OMWD METER EXHIBIT A - EXTENT OF CMWD'S RECYCLED WATER SYSTEM WITHIN VALLECITOS WATER DISTRICT DATE: 08/12/2008 NAME: LRosu/Arome FILE: J:\GIS\Engineering\GIS_Projects\ArcviewProjects-LR\Ptummer \\ AGREEMENT FOR SALE OF RECYCLED WATER AND USE OF MAHR RESERVOIR BETWEEN THE VALLECITOS WATER DISTRICT AND THE CARLSBAD MUNICIPAL WATER DISTRICT This Agreement is made and entered into by and between the VALLECITOS WATER DISTRICT ("VALLECITOS"), organized and existing pursuant to Water Code section 30000 et seq., and the CARLSBAD MUNICIPAL WATER DISTRICT ("CARLSBAD"), a Public Agency organized under the Municipal Water Act of 1911, and a subsidiary district of the City of Carlsbad organized and existing pursuant to Water Code section 71000 et seq. (collectively, the "Parties"). RECITALS A. On June 13, 1991, the Parties entered into an agreement (the "1991 Agreement") for the sale of recycled water from the VALLECITOS' Meadowlark Reclamation Facility ("MRF"). Since July 1991, VALLECITOS has provided recycled water to CARLSBAD in accordance with the terms and conditions of the 1991 Agreement. B. VALLECITOS is currently in the process of evaluating an expansion of the MRF and the increase in production from two (2) million gallons per day ("MOD") of recycled water to a potential of five (5) MOD. C. VALLECITOS also owns, operates, and maintains the Mahr Reservoir•, which has the capacity to store fifty-four (54) million gallons ("MG") of recycled water and is located within the boundaries of both VALLECITOS and the City of Carlsbad. D. CARLSBAD is in the process of developing an expansion of its recycled water system referred to as the Encina Basin Water Reclamation Program, Phase II Project ("Phase July M. 2003 (10 59AM) G:\DATA\WP\DOUXK\reviMdMlhi06.jgr wjd 1 II Project"). CARLSBAD desires to use the Mahr Reservoir for seasonal, operational (diurnal), and emergency storage as part of the Phase II Project. The scheduled dates for implementation of the Phase II Project is July 2005. E. VALLECITOS agrees to allow CARLSBAD to use a portion of the storage capacity of Mahr Reservoir, provided CARLSBAD constructs certain improvements to the Mahr Reservoir. The storage capacity available to CARLSBAD in the Mahr Reservoir shall be up to 32 MG, provided CARLSBAD purchases from VALLECITOS an additional one (1) MOD of recycled water (for a total of 3 MOD) as part of the Phase II Project. F. CARLSBAD acknowledges that delivery of the recycled water volume outlined in this Agreement is contingent upon the expansion of the MRF by VALLECITOS and sufficient development within VALLECITOS and build out of the Meadowlark area and drainage basin to provide enough effluent to produce the recycled water. NOW, THEREFORE, the Parties agree to the following terms and conditions: 1. Construction of Mahr Reservoir Improvements. CARLSBAD shall be responsible for constructing and installing certain improvements (the "Improvements") that include, but may not be limited to, the draining and cleaning of the interior storage area of the Mahr Reservoir, installing a chlorination system and aeration system, modifying the inlet/outlet works, and installing an asphalt concrete liner and floating polypropylene cover as further described in the Encina Basin Recycled Water Distribution Study prepared by CGvL Engineers in association with John Powell & Associates, Inc., dated May 2000 (the "Study"). A copy of the Study is attached to this Agreement as Exhibit "A" and incorporated herein by reference. VALLECITOS has reviewed the Study and consents to the recommended Improvements and other pertinent improvements. CARLSBAD shall provide VALLECITOS with sixty (60) days written notice prior to beginning construction of the July 24. 2003 (10 59AM) GADATAVWP\DOLDOC\revi«dMilic06.ijr.W(K) 2. improvements. Construction of the Improvements shall be subject to coordination with VALLECITOS staff. The schedule to construct the Improvements is based on CARLSBAD receiving a commitment for funding from the State of California in 2003, whereby construction would begin in 2003 and extend through 2004. 2. Funding and Design of Improvements. CARLSBAD shall construct the Improvements with funding obtained from state and federal loans and grants. CARLSBAD shall be responsible for the design and preparation of the plans and specifications for the Improvements and will obtain any necessary permits on behalf of VALLECITOS and with the written consent of VALLECITOS, which consent shall not be unreasonably withheld. All plans and specifications for the Improvements shall be submitted to VALLECITOS for review and approval, which approval shall not be unreasonably withheld. CARLSBAD shall construct the Improvements in accordance with the approved plans and specifications and permit conditions including compliance with CEQA and all other regulatory bodies. The Improvements shall become the property of VALLECITOS and shall be dedicated to VALLECITOS for operation and maintenance. If funding for the Improvements is not approved by the State of California, then CARLSBAD is not obligated to design or construct the Improvements. In the event the Improvements are not constructed, for whatever reason, all rights of CARLSBAD to purchase recycled water beyond 2 MGD and to utilize storage in the Mahr Reservoir shall terminate in the discretion of VALLECITOS. 3. Mahr Reservoir Storage Capacity. CARLSBAD shall have the right to utilize up to 32 MG of storage capacity available in the Mahr Reservoir for its Phase II Project. In the event CARLSBAD discontinues the purchase of recycled water from VALLECITOS, the use of storage capacity of the Mahr Reservoir shall automatically revert to VALLECITOS. CARLSBAD shall be allowed to utilize Mahr Reservoir for peak demands in accordance with the approved Operations and Maintenance manual referenced in Section 5. In no event shall CARLSBAD have any priority in Hydraulic Grade Line (HGL) or July 24. 2003 (10:59AM) O:\DATA\WP\DOLDOCVrtviJedMilii06igrwpil 3 available capacity of the reservoir and shall be entitled to up to a maximum of 60% of the storage available at any given time. 4. Master Flow Meters. Master recycled water flow meters ("Master Flow Meter(s)") shall be installed by CARLSBAD at or near the MRF, in locations mutually agreeable to the Parties, to measure the quantity of recycled water supplied to CARLSBAD from the MRF. VALLECITOS shall be responsible for operating, maintaining, calibrating, and reading the Master Flow Meter(s) on a routine basis. VALLECITOS shall read and report to CARLSBAD the meter results no less than once per month and shall provide copies to CARLSBAD of calibration results on an annual basis. VALLECITOS shall deliver recycled water to CARLSBAD to the mutually agreed upon locations of the Master Flow Meter(s) and shall have no responsibility or obligation to deliver recycled water beyond the Master Flow Meter location(s). 5. Ownership. Operation, and Maintenance of Mahr Reservoir Improvements. VALLECITOS shall own, operate, and maintain the Mahr Reservoir and all Improvements constructed for the Mahr Reservoir. A draft operation and maintenance manual shall be prepared by CARLSBAD for review, and approval by VALLECITOS, for operation and maintenance of the Improvements, which will be incorporated in an operations and maintenance manual for the operation of MRF, Mahr and the Failsafe pipeline. VALLECITOS shall operate the Improvements in conformance with the approved operations and maintenance manual. Notwithstanding the foregoing, in no case shall VALLECITOS be required to operate the Improvements in a fashion that will be harmful or detrimental to the operation of the MRF, Mahr Reservoir, or the Fail Safe pipeline. 6. Operation and Maintenance of Other Related Facilities. VALLECITOS shall own, operate, and maintain, per the approved operations and maintenance manual, the July 24, 2003 110:59AM) G:\DATA\WP\DOLDOCNrevisedMihi06.agr.wpd recycled water transmission pipeline identified on the attached Exhibit "B," which is incorporated herein by reference. Each party shall grant to the other necessary easements and rights-of-way to construct, operate and maintain the recycled water facilities described in this Agreement that they respectively control and assist each other to obtain easements or rights-of-way on lands controlled by other entities not subject to this Agreement. 7. Failsafe Pipeline Capacity and Operation. CARLSBAD acknowledges and agrees that under certain operational scenarios, the full production of MRF may exceed the failsafe pipeline capacity of 3 MGD and to accommodate operational goals, the Mahr Reservoir may be at capacity with no additional, available storage. To accommodate such an event, CARLSBAD agrees, per the approved operations and maintenance manual, to provide adequate facilities and operational flexibility to VALLECITOS to dispose of the additional flow into the CARLSBAD recycled water distribution system for either use or disposal. Disposal of recycled water through the CARLSBAD system is subject to and predicated upon the availability of adequate capacity at the Encina Wastewater Authority (EWA) flow equalization facility and coordination with EWA. All excess recycled water, beyond purchases required in Section 8 and peak demands, shall meet the quality requirements contained in Section 10. The method of disposing shall be identified in the operational parameters agreed upon between the Parties. CARLSBAD agrees to completely remove the existing Phase I Pump Station, located at El Camino Real, prior to or concurrent with the initial delivery of 3 mgd of recycled water in accordance with Section 8. CARLSBAD agrees to replace the existing 12-inch Failsafe pipeline with like pipeline material in accordance with VALLECITOS standards. July 21, 2003 (10 59AM) G:\DATA\WP\DOLDOC\ievijedMahi06.agr.wpd 8. Quantities of Recycled Water to be Purchased. During the term of this Agreement, CARLSBAD agrees to purchase, and VALLECITOS agrees to deliver to the CARLSBAD recycled water distribution system (provided flows are sufficient), the following minimum amounts of recycled water from the MRF: a. Prior to completion of the Phase II Proj ect, CARLSBAD shall continue to purchase a minimum of 2 MOD of recycled water which is approximately 2,240 acre-feet per year. b. Upon completion of the Phase II Project, and provided VALLECITOS has completed the expansion of the MRF and adequate effluent is available, CARLSBAD agrees to purchase a minimum of 2 MOD of recycled water during the months of December, January, February, and March and 3 MOD of recycled water for the remaining months which is approximately 2,989 acre-feet per year. 9. Interruption of Delivery of Recycled Water. Notwithstanding the provisions of section 8 above, the Parties understand and agree that there shall be no liability to VALLECITOS to supply recycled water, or obligation of Carlsbad to purchase recycled water for day-to-day interruptions in delivery of recycled water due to plant emergencies requiring plant shut down and repairs associated with acts of God, permit compliance, orders by regulatory bodies or judicial courts, and/or equipment breakdowns, or substantial maintenance activities. VALLECITOS shall make good faith efforts to resume delivery of recycled water in a timely manner after completing the necessary efforts to restore the operation of MRF. If recycled water delivery is discontinued for more than seven (7) consecutive days, then VALLECITOS shall provide CARLSBAD a time schedule indicating when delivery is expected to resume. July 24, 2003 (}0:WAM) G:\DATA\WP\E>OLDOCVevisedMahr06.agr.wpd 10. Treatment Standards. VALLECITOS shall treat the recycled water from the MRF in conformance with the water quality requirements as provided by Title 22, Division 4, of the California Code of Regulations ("CCR"), section 60305, "Use of Recycled Water for Impoundments," intended as a source of supply for non-restricted recreational impoundments suitable for body contact in compliance with the criteria specified in CCR section 60301.230(b) for "Disinfected Tertiary Recycled Water" (Title 22). VALLECITOS shall use its best good faith efforts to ensure that said recycled water meets the forgoing CCR Title 22 standards, however, VALLECITOS does not guarantee or warrant the quality of the recycled water provided CARLSBAD or subsequent users. Both Parties understand that the presence of dissolved minerals in the recycled water is measured as total dissolved solids (TDS) and other substances in higher concentrations can be deleterious to the plants irrigated with such water. Both Parties agree that VALLECITOS' failure to supply recycled water with TDS concentration of less than 1000 milligrams per liter (MG/L), as determined in conformance with the methodology specified in the Encina Waste Pollution Control Facility Waste Discharge Permit, will be grounds for CARLSBAD to suspend its obligation to accept and pay for recycled water from VALLECITOS until quality is restored to less than 1000 MG/L TDS. V ALLECITO S agrees to limit the total chlorine residual to 10 parts per million (ppm) or less, based upon a 24 hour period average, for recycled water discharged from the MRF. This limitation shall not be applicable to water discharged to the VALLECITOS Failsafe pipeline. The Parties further recognize that during periods of drought VALLECITOS may experience lower flow as a result of conservation efforts. However, the amounts of salts received would not decrease and can cause the TDS levels to rise. During such drought periods as designated by the Metropolitan Water District ("MWD") and/or the San Diego County Water Authority ("Water Authority"), the Parties agree that recycled water with TDS July 2<, 2003 (IO:J9AM) G:\DATA\\VP\DOLDOOrewsedMihr06.tgr.wpd 7 concentration of no more than 1200 MG/L will be an acceptable quality to CARLSBAD under the terms of this Agreement. 11. Recycled Water Delivery Pressure. Recycled water delivered by VALLECITOS to the CARLSBAD distribution system shall not be at a guaranteed minimum pressure. However, the following hydraulic grade line ("HGL") shall be met for recycled water discharges from the MRF to the Mahr Reservoir facility. Discharge pressure for delivery at the Mahr Reservoir shall be equivalent to a minimum HGL of 550 feet, including all pipeline headloss, with an operational HGL goal of 590 feet to maximize operational flexibility. 12. Compliance With Regulatory Requirements. CARLSBAD agrees to comply with all applicable recycled water distribution regulations issued and/or mandated by the State of California Department of Health Services (DHS), the County of San Diego Department of Environmental Health (DEH), and the California Regional Water Quality Control Board, San Diego Region (Regional Board). CARLSBAD shall be responsible for insuring that all users of recycled water within CARLSBAD'S jurisdiction shall be in compliance with CARLSBAD'S discharge order issued by the Regional Board, and that all users shall be made to comply with CARLSBAD's most recent recycled water rules and regulations. 13. Price of Recycled Water. Through Fiscal Year 2003/2004, CARLSBAD shall purchase, disinfected tertiary recycled water from VALLECITOS at the rate of Three Hundred Sixty-One Dollars ($361.00) per acre-foot, and CARLSBAD shall pay VALLECITOS for the recycled water based on quarterly statements submitted by VALLECITOS. Beginning Fiscal Year 2004/2005 the purchase cost shall be based on the table for Pre-Expansion Annual Cost for the MRF Tertiary Facilities listed in Exhibit "C". Upon completion of the MRF expansion, and initial delivery of 3 MGD to CARLSBAD, July 24. 2003 <IO:59AM) G \DATA\WP\DOLDOC\jeviMdMihi06.igr wp<l •8 CARLSBAD shall purchase, in accordance with section 8(b), disinfected tertiary recycled water from VALLECITOS using the table for Post-Expansion Annual Cost for MRF Tertiary Facilities listed in Exhibit "C." CARLSBAD shall pay VALLECITOS the annual cost in twelve (12) equal payments throughout each fiscal year. Both the Pre-Expansion and the Post-Expansion Annual Costs shall be based on VALLECITOS' budgeted figures as of the beginning of each fiscal year and adjusted to actual costs through retrospective adjustments after the conclusion of each fiscal year. The recycled water cost shall be adjusted on July 1 of each year during the term of this Agreement to reflect CARLSBAD'S proportionate share of the budgeted operational, overhead, and capital recovery costs for the MRF Tertiary Facilities, Lift Station No. 1, and Mahr Reservoir as shown in Exhibit "C". VALLECITOS will provide CARLSBAD thirty (30) days' advance written notice of any changes in the annual cost. VALLECITOS will bill or credit CARLSBAD annually for retrospective adjustments to reflect actual water delivery costs incurred. CARLSBAD will be notified of the retrospective adjustment by November 30 of each fiscal year and the adjustment credit/invoice shall be due and payable within 30 days of said date. At any time during the term of this agreement, the price of the recycled water shall not exceed seventy- five percent (75%) of CARLSBAD'S wholesale cost of potable water from the San Diego County Water Authority. The definitions for terms used in this section 13 and Exhibit "C" follow: MRF Facilities - Wastewater treatment, filtration, disinfection, conveyance, storage and effluent pumping facilities shown on Exhibit "B". Also known as Meadowlark Reclamation Facility (MRF). MRF Tertiary Facilities - Filtration, disinfection, and effluent pumping facilities relating to Tertiary Treatment at the MRF. July 24. 2003 (IO:S9AM) G:VDATA\WF\DOLDOOnvi>edMlhr06.lgl.wpd Mahr Reservoir - A 54 million-gallon earthen reservoir used to store tertiary treated recycled water located as shown on Exhibit "B". Lift Station No. 1 - Components associated with the existing lift station used to divert sewage to the MRF for treatment and production of recycled water. Overhead - Wastewater Department Overhead - General, administrative and overhead costs incurred within the Wastewater Dejpartment not directly associated with the collection, conveyance and treatment of wastewater. Pre-Expansion Cost-This includes all costs associated with the operation and maintenance of the MRF Tertiary Facilities, Lift Station No. 1, Mahr Reservoir and identified capital recovery costs, shown in Exhibit "C" under the title "Pre-Expansion Annual Cost." Post-Expansion Cost - This includes all costs associated with the operation and maintenance of the MRF Tertiary Facilities, Lift Station No. 1, Mahr Reservoir and capital recovery costs shown in Exhibit "C" under the title "Post-Expansion Annual Cost." These costs will apply after VALLECITOS has begun the initial delivery of 3 mgd to CARLSBAD. 14. Terms of Payment. CARLSBAD shall be invoiced by VALLECITOS on a monthly basis for the minimum delivery scheduled amounts plus any amounts that exceed the minimum amounts. CARLSBAD agrees to pay VALLECITOS for such purchases within thirty (30) days of invoice receipt. In the event that payment is more than thirty (30) days in arrears, VALLECITOS reserves the right to stop delivery of recycled water until payment is made and charge interest of one percent (1%) per month on delinquent amounts. July 2«, 2003 (IO:59AM) G:\DATAttWDOLDOOrcvijedMihtW.igr wjxl 10 15. Right to Sell to Others/Utilization of Storage. In the event CARLSBAD fails to purchase the minimum quantities of recycled water as required in section 8 of this Agreement, VALLECITOS shall have the absolute right and discretion to sell the unused recycled water to other parties. Any amounts sold by VALLECITOS to other parties shall be deducted from any remaining amounts that CARLSBAD is obligated to purchase pursuant to section 8 of this Agreement. In addition, in the event CARLSBAD fails to purchase the minimum quantities of recycled water as required in section 8 of this Agreement, all rights of CARLSBAD to utilize storage in the Mahr Reservoir shall revert to VALLECITOS and VALLECITOS shall have no obligation or liability to reimburse CARLSBAD for the cost of the Improvements. Provided, however, in the event VALLECITOS willfully refuses to provide recycled water to CARLSBAD, when available, prior to complete depreciation of the Improvements identified in section 1 "Construction of Improvements," VALLECITOS shall reimburse CARLSBAD for the lesser of the fair market value or the undepreciated value of the Improvements. In the event VALLECITOS uses or sells recycled water to additional parties, VALLECITOS will reimburse or credit CARLSBAD with up to forty percent (40%)of the cost of the improvements, based upon a ratio of water sold to CARLSBAD and total sales, of the annual depreciated value of the Improvements identified in Section 1 based upon a thirty (30) year useful life. The reimbursement or credit shall be in accordance with the annual review of the price of the recycled water in accordance with Section 13. 16. Access to Records. The Parties shall each keep proper books and records in which complete and correct entries shall be made of all recycled water delivered to CARLSBAD throughout the duration of this Agreement. These books and records shall, upon written request, be subject to inspection by any duly authorized representative of each party and of the Regional Board. July 24, 2003 (10:59AM) G:\DATA\WPUX)LDOOrevi»IM<|ti06.ijr.wpd 11 17. Notices. Notices required or permitted under this Agreement shall be given in writing and may either be served personally upon the party to whom it is directed or by deposit in the United States Mail, postage pre-paid, certified, return receipt requested, addressed to the Parties' following addresses: ' CARLSBAD: Carlsbad Municipal Water District 1635 Faraday Avenue Carlsbad, CA 92008 Attention: Public Works Director VALLECITOS: Vallecitos Water District, 201 Vallecitos de Oro San Marcos, CA 92069 Attention: General Manager 18. Assignment. This Agreement or any interest therein or any monies due or that are to become due thereunder shall not be assigned, hypothecated, or otherwise disposed of without the prior written consent of both Parties to this Agreement, which consent shall not be unreasonably withheld. This Agreement shall become effective on the date it is executed by the Parties. 19. Term of Agreement. The term of this Agreement shall be twenty-two (22) years from the effective date, subject to the rights of the Parties to an earlier termination as provided in this Agreement. This Agreement shall continue in force from year to year after the initial 22-year term until either party gives one (1) year's written notice to the other of its intention to terminate or renegotiate the Agreement. This Agreement shall terminate one (1) year from the date upon which such written notice is received unless the Parties agree otherwise in writing. 20. Early Termination. If at any time during the term of this Agreement recycled water in compliance with the standards referenced herein cannot lawfully be used by CARLSBAD for the purposes intended by this Agreement, because of government July24, 2003(IO;59AM) G:\DATA\VmDOLDOC\ievistdMahr06.jgr.wpd I/ regulations now in effect or hereinafter imposed, or, if CARLSBAD should for any reason breach its obligations under this Agreement in any material respect, including, but not limited to, failure to pay for recycled water as required, failure to accept recycled water as required, failure to maintain facilities, or other substantial failure, VALLECITOS may terminate this Agreement with no further obligation by giving sixty (60) days' written notice thereof to CARLSBAD. During said sixty (60) day period, CARLSBAD shall have the opportunity to cure the breach in the Agreement before termination occurs. In the event VALLECITOS refuses to deliver recycled water to CARLSBAD in conformance with this Agreement for any reason, CARLSBAD may terminate this AGREEMENT with no further obligation upon sixty (60) days' written notice thereof to VALLECITOS. 21. Entire Agreement. This Agreement constitutes the entire understanding between the Parties with respect to the subject matter hereof superseding all negotiations, prior discussions, agreements, and understandings, written or oral, including the 1991 agreement. This Agreement shall not be amended, except by written consent of the Parties, and no waiver of any rights under this Agreement shall be binding unless it is in writing signed by the party waiving such rights. In the event any provision of this Agreement shall be held to be invalid and unenforceable, the other provisions of this Agreement shall be held to be valid and binding on the Parties. 22. Binding Effect. This Agreement shall be binding upon the Parties and their respective successors in interest, permitted assigns, executors, administrators, and personal representatives. 2 3. Indemnification. VALLECITOS agrees, to the fullest extent permitted by law, to indemnify and hold CARLSBAD, its directors, officers, employees, or authorized volunteers harmless from any damage, liability, or cost (including attorney's fees and costs of defense) to the extent caused by VALLECITOS' negligent acts, errors, or omissions in July 24. 2003 (10: S9AM) G:\DATA\WP\[XMJX>C\reviie<iMihrtJ6.lljr.wp<i 13 the performance of work pursuant to this Agreement, including such negligent acts, errors, or omissions by subcontractors or others for whom VALLECITOS is legally liable. CARLSBAD agrees, to the fullest extent permitted by law, to indemnify and hold VALLECITOS, its directors, officers, employees, or authorized volunteers harmless from any damage, liability, or cost (including attorney's fees and costs of defense) to the extent caused by CARLSBAD'S negligent acts, errors, or omissions in the performance of work pursuant to this Agreement including such negligent acts, errors, or omissions by subcontractors or others for whom CARLSBAD is legally liable. 24. Venue. In the event of any legal or equitable proceeding to enforce or interpret the terms or conditions of this Agreement, the Parties agree that venue shall lie only in the courts in or nearest to the North County Judicial District, County of San Diego, State of California. 25. Counterparts. This Agreement may be executed in any number of counterparts, each of which shall be deemed an original, but all of which, taken together, shall constitute one and the same instrument. Jul>24,2003 (10:59AM) G:\DATA\WP\DOLDOOreviiedMihi06.igr.wixl 14 IN WITNESS WHEREOF, the Parties hereto have caused this Agreement to be 2003.executed and effective as of n^c^&i 3-Q ,c/ "VALLECITOS": VALLECITOS WATER DISTRICT 'CARLSBAD": jftVo r<Lo^n^fVYv, Trish Hannan President BAD.MUNIC v \ ide "Bud" Lewis President ATTEST: General Manager Date: APPROVED AS TO FORM: . Scott, General Counsel RonaldR: Ball, General Counsel July 24. 1003 (10 59AM) 0 \DATA\WP\DOLDOC\reviiedMlhi06 jjrw 15 Carlsbad Municipal Water District Preliminary Design for the Encina Basin Phase II Recycled Water Distribution System MAHR RESERVOIR EVALUATION CAIHCABT; VONlANGEN; CCvLENGINEERS POWELL in Association with John Powell & Associates, Inc. Consulting Civil Engineers May 2000 Exhibit "A" Table of Contents CHAPTER 1 BACKGROUND . 1-1 Mahr Reservoir Physical Properties 1-1 Mahr Reservoir Operational Issues 1-4 Other Seasonal Storage Reservoirs 1-4 CHAPTER 2 BASIS OF EVALUATION ..—...... .. 2-1 Facility Sizing Criteria , ............2-1 Demand Criteria . ; ...,.;.... ^ »2-l System Pipeline Criteria ..........'.;.... ........... ........2-2 Project Cost Data ; ...'; '..;: ..2-2 Construction Costs 2-2 Cost Index and Price Escalation ...:..... ...2-3 Construction Contingencies .....'.......2-3 Engineering and Administration ; 2-4 CHAPTER 3 SUPPLY/DEMAND/STORAGE ANALYSIS—. ...3-1 Seasonal Storage ...3-1 Demands 3-1 Supplies '. 3-2 Seasonal Balancing .....3-3 Emergency Storage ,3-4 CHAPTER 4 FACILITY ALTERNATIVES ........4-1 Possible Facility Improvements 4-1 Inflow Nutrient Removal ..4-1 Modified I/O Works 4-2 Aeration/Destratification System 4-5 Outflow Chlorination 4-8 Outflow Microscreening 4-9 Reservoir Lining and Covering 4-9 Miscellaneous Site Work : 4-12 Alternative Combinations of Improvements 4-12 CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES Table of Contents (Continued) CHAPTER 5 ALTERNATIVE COSTS AND PHASING.i •*•••• 3™ A Mahr Reservoir Use Benefits 5-1 Comparative Improvement Costs _ , 5-2 Improvement Phasing ..; 5-4 CHAPTER 6 RECOMMENDATIONS 6-1 Facilities . 6-1 Monitoring Program 6-1 APPENDIX A HISTORICAL RECYCLED WATER DEMANDS A-l APPENDIX B SEASONAL STORAGE MODEL RUNS B-l APPENDIX C EMERGENCY STORAGE MODEL RUNS........ C-l LIST OF TABLES Table 1-1 Other Seasonal Storage Reservoir Features 1-6 Table 3-1 CMWD Recycled Water Supply Availability ,3-3 Table 3-2 CMWD Peak-Month Supply/Demand Balance 3-3 Table 3-3 Mahr Reservoir Seasonal Benefits to CMWD 3-4 Table 4-1 Mahr Reservoir I/O Hydraulic Parameters 4-5 Table 4-2 Cost Opinion for Mahr Reservoir I/O Works 4-7 Table 4-3 Cost Opinion for Lining and Covering Mahr Reservoir 4-11 Table 5-1 Comparative Costs for Mahr Reservoir Phase II Capacity Value....5-3 Table 5-2 Comparative Costs for Mahr Reservoir Ultimate Capacity Value...5-4 Table 5-3 Cost Opinion for Initial Mahr Reservoir Improvements 5-5 Table 6-1 Mahr Reservoir Monitoring Program 6-1 LIST OF FIGURES Figure 1-1 Mahr Reservoir Features 1-2 Figure 1-2 Mahr Reservoir Volume and Surface Area Curves 1-3 Figure 2-1 Engineering News Record Construction Cost Index 2-3 Figure 3-1 CMWD Recycled Water Demand Hydrograph 3-2 Figure 4-1 Proposed Mahr Reservoir Improvements 4-3 Figure 4-2 Proposed Mahr Reservoir I/O Works 4-4 Figure 4-3 Upper Oso Reservoir I/O Works '. 4-6 Figure 4-4 Proposed Mahr Reservoir Operations Building Site 4-8 CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES Chapter 1 Background Carlsbad Municipal Water District (CMWD) desires to evaluate the feasibility of using Mahr Reservoir for seasonal storage in CMWD's recycled water distribution system. This evaluation's purpose is to investigate mitigation for historical reservoir operational problems, analyze the effect of this storage volume at various system expansion milestones, evaluate specific reservoir improvements and determine the best combination to pursue, provide an opinion of probable cost, and recommend a course of action for implementation. Mahr Reservoir Physical Properties Mahr Reservoir is owned and operated by Vallecitos Water District (VWD). The reservoir is an unlined and uncovered basin formed by a jurisdictional earthen . dam, with a, crest elevation of approximately 598.5 feet. The reservoir bottom was originally established at approximately 542.5 feet and the spillway elevation is at approximately 594.5 feet. Possibly to allow .for storm retention, the maximum operating pool was set in the original facility design at approximately 593.0 feet. For this evaluation, to allow for continued submergence of a possible aeration/destratification system, and to avoid water quality problems associated with shallow storage volumes, a minimum operating pool was set at approximately 555.0 feet, which would maintain a minimum water depth of approximately 12.5 feet. The effective working storage volume associated with the difference between the maximum and minimum pools is approximately 151 acre-feet (AF), or approximately 49 million gallons (MG). The water surface area at maximum pool depth is approximately 7.7 acres. Figure 1-1 provides recent photos of the reservoir dam crest and spillway. Figure 1-2 provides reservoir volume and area curves in relation to water depth, expressed as feet of-elevation above mean sea level (amsl). Inflow and outflow occur through a concrete structure located near the reservoir bottom at the upstream dam toe. This structure has grated, unvalved ports, and is serviced by an 18-inch diameter pipeline that passes underneath the dam and connects with another concrete structure at the downstream dam toe. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES i -1 Background Dam crest, looking north. Dam spillway, looking northeast. Figure 1-1 Mahr Reservoir Features CGvL ENGINEERS FN ASSOCIATION WITH JOHN POWELL & ASSOCIATES Background Mahr Reservoir Volume cr\f\ - - ' -600 -]5 CQO :E 590 : W con : tf 58° =0) c-yn -«**• 570 :•» , C coo JO 560 ; tJ ••cJcn -« 550 ; <D rAr\ q. '- MAXIMUM : */ ; /MINIMUMi«»if*«»**>*« •••••••*:y? OPERATING P< ^ OPERATINGPJ X)L O EL. 593 >••*••••••••••»•••••• ^ J4- WORKING CAPACITY =1 51 AF - E 540 || ^*"lrt T i '!_-'! 'i i i i 1(11 ••< ••••*••••••*••• W " • 111 •••f ••*•»••••••••••• .1111•VjM 1 T it ! 1 1 1 1 i 1 1 1 ill I I I I 0 50 100 150 200 250 Volume, acre-feel Mahr Reservoir Surface Area 600 - J2 con :E 590 : w con : - 580 : Q> c-7/-. - •S- 570 ; C cor\ -0 POO : 15 ncn -W 550 1 0) r-yin ; ID S40 ? port MAXIMUM! OPERATING PI1 «-"- /•/ ^ XX « EL. 593 ^*<> ^^ OOO ' ' ' ' ' ' : i . . : i , • i.| 0.0 2.0 4.0 6.0 8.0 10.0 Area, acres Figure 1-2 Mahr Reservoir Volume and Surface Area Curves CGvL ENGINEERS DM ASSOCIATION WITH JOHN POWELL & ASSOCIATES 1-3 Background Mahr Reservoir Operational Issues Ongoing water quality problems experienced by VWD prompted installation of fine screens and implementation of associated procedures at their Meadowlark Water Reclamation Facility (WRF) for treatment of all water withdrawn from the reservoir. Historically, during normal operation, effluent from the WRF was pumped to Mahr Reservoir. Outflow from Mahr Reservoir flowed by gravity through a 20-micron microscreen to remove algae before it was pumped again into the recycled water distribution system. Microscreen effluent could then either flow through a chlorine contact tank or directly into the recycled water distribution system pumping station wet well. However, because of continued odor and algae complaints by recycled water customers, with Mahr Reservoir as the suspected source, the reservoir was taken out of service in 1998. Since that time there have been no further complaints regarding odors and algae. Other Seasonal Storage Reservoirs As a basis for comparison, this evaluation reviewed design features and operating, histories of other recycled water seasonal storage reservoirs with volumes approximately equal to or greater than Mahr Reservoir's. However, relatively few such seasonal storage reservoirs exist. Three of them are located in Orange County. Sand Canyon and Rattlesnake Reservoirs are owned and operated by Irvine Ranch Water District (IRWD), and have total volumes of 800 AF and 1,200 AF, respectively. Upper Oso Reservoir is owned and operated by Santa Margarita Water District (SMWD), and has a total volume of 4,000 AF. All three reservoirs have been in recycled water service for over 20 years. The City of Santa Rosa, located in northern California, owns and operates several recycled water storage reservoirs. The largest has a volume of 2,000 AF and has been in service for approximately 16 years. Their next two largest reservoirs have volumes of 1,100 AF and 700 AF, respectively, and have been in service for approximately 22 years. All three reservoirs have relatively flat bottoms, with an average water depth, when full, of 24 to 25 feet. All three reservoirs are surrounded by man-made berms, with virtually no tributary drainage area. For this evaluation, these three reservoirs are designated Santa Rosa A, Santa Rosa B, and Santa Rosa C, respectively. In discussing design and operation of these reservoirs with respective agency staff, several features emerge for possible application at Mahr Reservoir: a Relative size and watershed management of upstream tributary area a Average water depth of full reservoir a Combination of treated wastewater with other water supplies a Nutrient removal from treated wastewater a Use of multiple-port inlet/outlet (I/O) works CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES . 1-4 Background o Use of an aeration/destratification system a Chlorination of reservoir outflow a Other treatment of reservoir outflow a Use of basin lining and covering Table 1-1 presents a matrix of these features, listed in the same order, and their involvement at the six above-noted, existing seasonal storage reservoirs. One of the most significant features to emerge in this evaluation appears to be the relative size and watershed management of upstream tributary area. By far the most problematic in this regard of the three reservoirs that have significant tributary area is Sand Ganyon Reservoir. Runoff from a large upstream tributary area carries in fine, colloidal material and algal nutrients, difficult to treat in reservoir outflow. Upper Oso Reservoir appears least problematic in this regard of the three. The ratio of tributary area to total reservoir volume for Sand Canyon Reservoir is approximately ten times larger than Upper Oso Reservoir's ratio. Mahr Reservoir, like the three Santa Rosa reservoirs, has almost no upstream tributary watershed area. ..... _~ .. .-,- • • - - t •- .'<-,. •• •-• .i'V •....."-_•• .-* - . •? f!>^^ A 11 Feature Tributary watershed area Average water depth Combined with other supplies Nutrient removal at plants Multiple port I/O works AerationflDestratification Chlorination of outflow Other treatment of outflow Basin lining and covering General problem history Sand Canyon Large 15aft No Minorb Yes Yese Yes8 Yesh No Yes Rattle- snake Small 15* ft Yes Minorb Yes Nof Yes8 No' No No Upper Oso Small 30ft No No Yes Yes No No4 No No Santa Rosa A None 25ft No • Minorc Yes No No No No No Santa 1 Rosa 8 1 None 24ft No Minor6 Nod No No No No No Santa 1 RosaC None 1 24ft No Minor0 Nod No ' No No No No ' a)1 Estimated, b) Partial nitrification/denitrification practiced at IRWD's Michelson Water Reclamation Plant, but not primarily for reservoir water quality. c) Partial nitrification/denitrificaiion practiced at Santa Rosa reclamation plant for last few years, but primarily motivated by regulatory requirement for winter river discharge. d) Have some turbidity problems with single port and seasonally low water levels. e) System installed in 1999 with successful performance. f) "Water quality tends to be good without aeration, but installation will be evaluated in 2000. g) Initially practiced for chemical oxidation of sulfides; later continued partially to maintain a chlorine residual in the associated distribution system. h) Have tried several types of relatively expensive filtration systems, with varied success, i) Have only occasionally used Adams strainers. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 1-5 Background The other significant feature to emerge in this evaluation appears to be the. average water depth of a reservoir when full. Santa Rosa staff reported no significant algae growth or other depth-related water quality problems when water depths were predominantly greater than about 8 feet. This meant their three largest reservoirs only suffered problems on the occasions when they were drained to within a few feet of their bottoms. Their two smaller reservoirs (not noted above), with volumes of approximately 200 to 300 AF, have average depths of about 4 feet and have been regularly plagued with algae and related water quality problems. The City has employed algae harvesters and barrel filters to mitigate these problems, with moderate success after considerable effort. Mahr Reservoir's average water depth when full is about 25 feet, and the.planned minimal pool depth is 12.5 feet. Application of the above considerations is explicitly made to Mahr Reservoir in Chapter 4. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 1 -6 K Chapter 2 Basis of Evaluation Design criteria and basic cost data presented herein apply to concept and preliminary level design and layout of recycled . water system components. Detailed drawings and specifications are not required in such layouts. For this level, a close approximation of size, location, and cost of various facilities is developed. As a result, some relocation and resizing of facilities may be required at a later date as more detailed engineering analyses are made during final design. Facility sizing is based on future recycled water requirements listed and developed in Chapter 3. Criteria and standards governing design of proposed facilities are assumed to use quality design, materials, and construction. Further, it is assumed that proper attention will be given to considerations such as appearance, landscaping, operation and maintenance efficiency, and service reliability. In planning future facility needs, an effort has also been made to effectively use existing components where practical. Proposed facilities described in this evaluation are planned as component parts of a system to serve the projected recycled water requirements of CMWD's proposed Phase n expansion to a system demand of approximately 5,400 acre-feet per year (AFY). Some attention is also given to those improvements required for ultimate expansion to a system demand of approximately 9,800 AFY. Facility Sizing Criteria Demand Criteria. Monthly demands are used to determine seasonal supply and storage needs for the recycled water system. The ratio of peak-month to average- month demand, or peak-month factor, is ultimately used in determining pumping and operational storage capacities. Hourly demands are directly used in determining pumping, operational storage, and pipeline capacities, and are determined by the average-day use during the peak month, multiplied by the ratio of 24 hours over the length of the regular daily irrigation period in hours. For example, in calculating peak-hour demands, the peak-month factor would be multiplied by two if a 12-hour irrigation period is assumed, or multiplied by three if an 8-hour irrigation period is assumed. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 2-1 Basis of Evaluation System Pipeline Criteria. System piping should be evaluated under all demand conditions, but performance assessment is typically most critical under peak-hour demand conditions. Generally, pipelines 12-inch and greater in diameter are considered transmission pipelines. Because transmission pipelines impact large areas, they can accumulate large head losses from long pipe runs. These large pipeline friction losses associated with high fluid velocities need to be evaluated with respect to system delivery capacity, and contribution to lowered system pressures and excessive energy consumption. Transmission pipelines are considered undersized if water velocities exceed 3 feet per second (fps) and head losses exceed 10 feet of head per 1,000 feet of pipe. Distribution pipelines are considered undersized if velocities exceed 5 fps and head losses exceed 10 feet of head per 1,000 feet of pipe. However, these criteria are only a guideline, and higher velocities and head losses may be tolerable under certain operating conditions such as system emergencies, and within short lengths of pumping station or reservoir yard piping where impact on system pressure is minimal. Project Cost Data Project cost is defined as the total capital investment necessary to complete a project, including costs for land acquisition, construction, contingencies, all necessary engineering services, and overhead items such as legal and administrative services, and financing. Probable construction cost opinions developed in this report include an allowance of 20 percent for contractor administrative expense, general overhead and profit (OH&P). Total project capital cost includes allowance for contingencies at 20 percent, and engineering and administration at 15 percent. Construction Costs. Probable construction cost opinions cover materials, taxes, labor, mobilization/demobilization, and services necessary to build proposed facilities. These costs derive from current or adjusted historical cost information and are intended to represent median prices anticipated for each type of work. Cost estimating guides, previous studies, cost curves, and recent contract bids were used to develop cost information. In an evaluation such as this, cost opinions are considered as defined by the American Association of Cost Engineers for preliminary design. .These are opinions made without detailed engineering data and have an expected accuracy range of plus 30 percent to minus 20 percent. Actual project costs will depend on future labor and material costs, market conditions, project-specific details, and other variables. The allowance of 20 percent for contractor OH&P is calculated from the subtotal of all other construction costs, the addition of which results in the total construction cost. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 2-2 Basis of Evaluation Cost Index and Price Escalation. Construction costs typically undergo long- term changes in keeping with corresponding changes in the regional and national economy. A commonly accepted barometer of these changes has been Engineering New Record's Construction Cost Index (ENRCCI), which is computed from prices of construction materials and labor, and is based on a value of 100 in the year 1913. As indicated on Figure 2-1, construction costs have been steadily increasing for many years. This figure shows ENRCCI's aggregate rate of increase for 20 major US cities, which is considered representative of construction costs in the San Diego area and, therefore, in CMWD. Project and construction costs in this report are based on a projected ENRCCI of 6,130 for January 2000 in the San Diego area. . 10.000 Jan-80 Jan-B2 Jan-B4 Jan-66 Jan-BB Jan-90 Jan-92 Jan-94 Jan-96 Jan-98 Jan-00 Jan-02 Figure 2-1 Engineering News Record Construction Cost Index Construction Contingencies. A contingency allowance covers uncertainties associated with project design. Factors such as unusual foundation conditions, special construction methods, variation in final lengths or average depths of pipeline, and construction adjacent to existing facilities are just a few of the many items that may increase construction costs, and for which an allowance is made'in preliminary design cost opinions. The cost of these items can vary greatly depending on the type and magnitude of project. An allowance of 20 percent of total construction cost is assumed to cover such contingencies, the addition of which results in the subtotal project cost. Engineering and Administration. The cost of engineering services for major construction projects includes some or all of the following: special investigations, surveys, foundation explorations, locating interfering utilities, detailed design, preparing contract documents, construction inspection, office engineering, materials testing, final inspection, and start-up of the completed project. Depending on the size and complexity of project, total engineering, legal and administrative costs may range from 7 to 40 percent of the contract cost. The lower percentage usually applies to relatively large projects, simple projects, and CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 2-3 Basis of Evaluation those not requiring a large amount of preliminary investigation. The higher percentage usually applies to smaller projects, projects requiring a great deal of engineering effort, or those requiring a relatively large amount of preliminary work. An allowance of 10 percent of subtotal project cost is assumed for this report. CMWD administration charges are assumed to cover items such as legal fees, financing expenses, administrative costs and interest during construction. The cost of these items can vary, but for the purpose of this evaluation, administration • charges are assumed to equal approximately 5 percent of subtotal project cost. The average total cost of all necessary engineering plus administrative services is therefore assumed to be 15 percent of the subtotal project cost, the addition of which results in the total project cost. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES Chapters Supply/Demand/ Storage Analysis Mahr Reservoir has the potential to provide seasonal, emergency and operational storage for CMWD's recycled water system. The first two storage types are analyzed in this chapter. Operational storage analysis is part of ongoing related work, but outside this evaluation's scope. Results of that analysis and those of this chapter are used in Chapter 5. Seasonal Storage Three expansion milestones were selected at which to assess Mahr Reservoir's possible seasonal benefit to CMWD's existing and planned recycled water system: (1) Current situation, representing an annual system demand of approximately 1,800 AFY (2) Completion of Phase II, representing an annual system demand of approximately 5,400 AFY (3) Ultimate expansion, representing an annual system demand of approximately 9,800 AFY Three CMWD system scenarios were selected to quantify the reservoir's benefit at each milestone: (A) System supply/demand fully balanced by hypothetical seasonal storage (B) System supply/demand balanced with no seasonal storage (C) System supply/demand balanced with Mahr Reservoir working storage Demands. All scenarios used the same recycled water demand hydrograph, which was developed from the last five complete years of actual CMWD metered demand. A listing of monthly demand values and related statistics for the years 1995 through 1999 is provided in Appendix A. Because the months in which peak and minimum demands occur are not the same from year to year, a simple average of each month, as shown in the second-to-last row of the table in Appendix A, does not result in representative factors for accurately modeling and projecting system demand variations. Rather, it tends to reduce peak demands and increase minimum demands. Therefore, this simple average was adjusted by an algorithm to preserve the true average peak-month and minimum-month factors, which is more representative of historical seasonal fluctuations. This CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES'3-1 Supply/Demand/Storage Analysis adjusted average is shown in the last row of the same table. The resulting adjusted peak-month factor of 2.10 is used for subsequent facility analysis. A unit hydrograph was developed for monthly irrigation demands based on this adjusted five-year system average. Figure 3-1 is a graphical representation of the adjusted hydrograph. Based on these adjusted factors, July has the representative peak-month demand and January has the representative minimum-month demand. This hydrograph is typical of recycled water monthly demand variations and reflects typical southern California irrigation cycles. 2.50 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov .Dec Month Figure 3-1 CMWD Recycled Water Demand Hydrograph Supplies. Existing and planned CMWD recycled water supply sources include the following: a Carlsbad Advanced Wastewater Treatment (AWT) facility, to be constructed by CMWD at the Encina Water Pollution Control Facility (WPCF), owned and operated by the Encina Water Authority . o Meadowlark WRF, owned and operated by VWD a Gafner Water Reclamation Plant (WRP), owned and operated by Leucadia County Water District Based on CMWD preferences, for this evaluation it is assumed that production capacities of these plants would be used in the order listed above. Estimated available peak-month plant supply capacities in million gallons per day (MOD) and acre-feet per month (AFM) for each of the three milestones are listed in Table 3-1. Calculated required plant supply capacities for each scenario, which are sometimes less, are discussed below. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 3-2 Supply/Demand/Storage Analysis Table 3-1 CMWD Recycled Water Supply Availability ;i 1 Supply Source Carlsbad AWT Meadowlark WRF Gafner WRP Total Estimated Peak-Month Availability Current MGD AFM 0.00 1.70 0.75 2.45 0 159 70 229 Phase II MGD AFM 4.00 2.00 2.00 8.00 374 187 187 747 Ultimate MGD AFM 15.0 3.0 2.0 20.0 1,401 280 187 1,868 Seasonal Balancing. A computerized spreadsheet model of CMWD's recycled water system was developed to test monthly supply/demand balances, and the resulting use of seasonal storage. The model was applied to each of the three scenarios at each of the three milestones, for a total of nine analyses. For those analyses using Mahr Reservoir as seasonal storage, reservoir filling was assumed to occur in January and February, the two lowest demand months. Copies of these analyses are found in Appendix B and labeled by milestone and scenario: 1A, IB, 1C, 2A, 2B, 2C, 3A, 3B, and 3C. A critical test for seasonal supply/demand balancing is satisfying peak-month demand, either directly from one or more supply sources, or from a combination of direct supply and water returned from seasonal storage (reservoir outflow). Peak-month results in AF from the nine analyses are summarized in Table 3-2. v <::p^tt--^f table 3-2« CMWD^&k^loT^ ''''':••&?$&''£ \ Milestone/ Scenario 1 - Current A B C 2 - Phase II A B C 3 - Ultimate A B C Peak-Month Volume, AF" Demand 315 315 315 945 945 945 1,716 1,716 1,716 Required Supply Carlsbad 0 0 0 374 374 . 374 817 1,401 1,401 Meadow. 150 159 159 76 187 187 0 280 164 Gafner 0 70 70 0 187 187 0 35 0 Other' 0 86 16 0 198 62 0 0 0 From Storage 165 0 70 495 0 136 899 0 151 Total Storage Volume, AF 548 0 151 1,644 0 151 2,983 0 151 a) Peak month assumed to be July, with a peak-lo-averagc-month ratio of 2.10, based on Figure 3-1. b) Because of round-off, sums of volumes may differ by ±1 AF. c) Other supply capacity assumed to be supplemented potable water. In assessing Mahr Reservoir's seasonal benefit to CMWD's system, it is helpful to compare the reservoir with an equivalent peak-month supply source, both in CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 3-3 Supply/Demand/Storage Analysis volume delivered (AF) and equivalent production rate (MOD). The estimated volume delivered from storage by Mahr Reservoir is shown in the second-to-last column for Scenario C under each of the three milestones in Table 3-2. It is also a useful perspective to see what fraction Mahr Reservoir's storage would represent of the total seasonal storage needed to fully balance the recycled water system for each of the three milestones. These data are summarized in Table 3-3.. ; Y - ^^Tabie 3-3 »M:4ir Reservoir Seasonal Benefits to CMWD -> 1 Milestone Current Phase n Ultimate Peak-Month Supply AF 70 136 151 Equivalent Peak-Month Production Rate MGD 0.75 1.46 1.62 Fraction of Fully-Balanced Storage percent 28 9 5 Because of production limitations in planned Phase n Meadowlark WRF and Carlsbad AWT expansions, 62 AF of other supply (probably potable water), in addition to Mahr Reservoir, would be needed to balance peak-month Phase n demands under Scenario 2C. Emergency Storage Mahr Reservoir's emergency storage benefit to CMWD's system depends on total recycled water production capacity available, demand on the distribution system, and volume of water in the reservoir, all at the time of the emergency, and time of year. Because of such a wide range of variables, only a sample analysis was performed, using the same computerized spreadsheet model noted above. As an analytical basis, the model was applied to the Phase II milestone Scenario 2C (see Appendix B), in which the routine seasonal filling of Mahr Reservoir occurred in January and February. After an assumed emergency draw-down to offset simulated lost supply in a given month, the model was constrained to refill the reservoir as quickly as possible so to be full in May, leaving the reservoir available to provide its full seasonal storage benefit. The simulated supply loss was constrained to be subsequently offset by recycled water production, up to maximum available rates, without the use of additional potable water supplement (beyond that already estimated for Scenario 2C). Given these constraints, there were only three months during which the reservoir could provide emergency supply: February, March and April. Three simulations were run, one for an emergency supply loss in each of those three months. Copies of these analyses are found in Appendix C and captioned by volume and month of supply loss, all being labeled Scenario 2D. The following emergency storage (supply loss offset) could be provided by Mahr Reservoir: in February, 149 AF; in March, 151 AF; and in April, 131 AF. CGvL ENGINEERS IN ASSOCIATION wrm JOHN POWELL & ASSOCIATES 3-4 Supply/Demand/Storage Analysis If water were stored in the reservoir—beyond the minimum operating pool volume—over more of the year, say starting in the fall, emergency supply could be available for more months. To maintain the full seasonal benefit discussed in the previous section, no emergency storage would be available-May through September. It is important to correctly condition emergency storage availability, so as not to inappropriately "double-count" Mahr Reservoir storage for both seasonal and emergency purposes. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 3-5 Chapter 4 Facility Alternatives ,-•;•. : -V -, '. <* : '. VK .:-.•'-- . - Possible Facility Improvements Mahr Reservoir's recycled water system benefit accrues both from seasonal and emergency storage value, noted in Chapter 3, and operational storage value, discussed in Chapter 5. To realize these values, facility improvements are required to mitigate known problems. These improvements could occur at the reservoir, or at other locations to affect water quality of reservoir inflow and/or outflow. The following improvements have been considered: a Removing nutrients from reservoir inflow at the wastewater treatment plants a Modifying the existing reservoir I/O works, with multiple ports for best seasonal water stratum selection a Adding an aeration/destratification system in the reservoir a Adding chlorination to reservoir outflow a Reusing existing microscreens, either at Meadowlark WRF or relocated to Mahr Reservoir, to remove suspended material from reservoir outflow a Adding reservoir lining and covering Wastewater Inflow Nutrient Removal. Phosphorus and nitrogen are macronutrients for algae and other plant growth. Both constituents are typically present in wastewater at concentrations many times higher than growth limiting values. Removing phosphorus from reservoir inflow would typically involve chemical precipitation as part of primary treatment at a wastewater treatment plant. Removing nitrogen would typically involve nitrification/denitrification as part of secondary treatment at a wastewater treatment plant. While Meadowlark WRF is physically closest to Mahr Reservoir, planned system-wide recycled water production, as illustrated in Chapter 3, projects Carlsbad AWT production to dominate the recycled water blend, even in Phase n. In addition, Gamer WRP's Phase n production is projected to be comparable to Meadowlark WRF's. Therefore, one or both nutrient removal processes would have to be implemented at all three plants to substantially control nutrients. Each nutrient removal process adds significant cost to a wastewater treatment plant's liquid stream and incidental cost to a plant's solids stream. While substantial nutrient reduction at each plant would help control algae growth in the reservoir, the nutrient loss is a disbenefit to the recycled water system's irrigation CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 4-1 Facility Alternatives customers. Various studies have valued the typical wastewater nutrient fertilizer "credit" at $40 to $50 per acre-foot. Estimating the precise benefit to the reservoir of a given amount of nutrient removal would require a detailed analysis of the combined plant effluents and water stored in the reservoir. The analysis would then determine limiting nutrient quantities, which typically involve very low concentrations, as treatment process target values. These estimations are beyond this evaluation's scope, and this candidate improvement is not considered further. Modified I/O Works. The current reservoir I/O works has only one set of openings around elevation 550 feet, only a few feet above the basin bottom. An improved I/O works would have multiple sets of openings, say four additional, equally spaced, approximately 9 feet apart vertically. This would allow selective water withdrawal from the stratum having the seasonally best water quality, e.g., avoiding a layer of algae in the top 5-10 feet of water, and avoiding intake of bottom sediment. There are two basic I/O works configurations: a free-standing tower rising from the reservoir bottom, and a laid-back structure secured to the upstream dam face. A free-standing tower could in concept be constructed on top of the existing I/O works. A laid-back structure could be connected between the existing I/O works and the toe of the upstream dam face. A review of conceptual design considerations for the two alternatives indicated the latter alternative would be less disruptive, probably less expensive, and therefore, preferable. Either I/O modification would require review by the State of California, Division of Safety of Dams (DSOD). Key consideration by DSOD would be maintaining adequate . and controllable reservoir draw-down capability for dam emergencies.- The plan location Of the modified I/O works with respect to the existing works and other existing and proposed reservoir features is shown on Figure 4-1. A drawing of a laid-back I/O structure is shown on Figure 4-2. Four I/O port valves would be provided for selecting the best quality water stratum, and an additional valve would isolate the existing works. The latter valve would be normally closed, and this existing opening used as a fifth regular I/O port and as an emergency outlet to satisfy jurisdictional dam draw-down requirements. Preliminary sizing of I/O works components was based on hydraulic network analyses of proposed CMWD recycled water distribution system expansions, which are represented in the recently completed Enema Basin Recycled Water Distribution System Study. Although volumes associated with Mahr Reservoir's operational storage function are relatively small compared with those of seasonal storage, operational storage peak-hour hydraulic requirements should be used to size I/O piping and valves. Table 4-1 lists peak-hour withdrawal rates estimated in the above-noted work for the Phase n and ultimate system expansions. As additional recycled water production capacity and operational storage volumes elsewhere are ultimately developed, the peak-hour demand on Mahr Reservoir's storage decreases from Phase II to the ultimate condition. Hence, the estimated CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 4-2 EXISTING ACCESS ROAD SCALE: 1'200' PROPOSED OPERATIONS BUILDING SPILLWAY (ELEVATION 584 J)VICINTY MAP NO SCALE TO RANCHO —'- SANTA FE ROAD _^1 PROPOSED CURB AND MAINTENANCE ROAD 11 TO RANCHO SANTA FE ROAD // PROPOSED // INLET/OUTLET // I I STRUCTURE-^/-H"4^/ '7 ' I / ' - /' '•"J I ll UUSIINB ACCESS ROAD EXISTING 18* ACP INLET/OUTLET PIPELINE PROPERTY BOUNDARY DAM CREST (ELEVATION 59S.51) EXTENT OF PROPOSED COVER/UNER IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES FIGURE 4-1 PROPOSED MAHR RESERVOIR IMPROVEMENTS ^1c=^|«lg PROPOSED AIR/VACCUM VALVE MAXIMUM OPERATING POOL W.S. EL 693 |.Y_ 4^.577 V MINIMUM OPERATING POOL W.S. EL 555PROPOSED SS SCREEN PROPOSED 24" STEEL PIPELINEi: PROPOSED 18'CONTROL VALVE PROPOSED PIPE SUPPORT, TYP PROPOSEDORATING EXISTING 18" ACP INLET/OUTLET PIPELINE PROPOSED 24"x18" REDUCER PROPOSED 18" RISERPROFILEi ' *""""• 550 540 PROPOSED 24" STEEL PIPELINE SECTION SCHJ6 I-HM* SCALE: HORZ1X8WT VERT 1"-1ff-0<PROPOSED 18-TEE- PROPOSED CONCRETE VAULT - -PROPOSED FLEXIBLE COUPLING, TYP -PROPOSED 18" CONTROL VALVE NCINIIII IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES FIGURE 4-2 PROPOSED MAHR RESERVOIR I/O WORKS Facility Alternatives Phase n peak-hour withdrawal rate is higher than the ultimate rate, and the Phase n rate should be used for I/O works sizing. Because the runs are short, the existing 18-inch I/O pipeline, which lies under the dam, and proposed extension up the dam face should be considered as distribution pipelines for sizing. As shown in Table 4-1, peak-hour velocities in the existing 18-inch I/O pipeline will exceed normal hydraulic design criteria discussed in Chapter 2. This situation would improve from Phase n to the ultimate condition. The higher velocities could be tolerated in the existing piping, since its replacement or paralleling would be extremely difficult, but the proposed extension to the works should use 24-inch piping, the nearest regular pipe size satisfying hydraulic design criteria. '•'•'^iL:';i'v-fr'V%'^ ~~:'::',\ Parameter Peak-Hour Flow Based on Existing I/O Pipeline Diameter (18 Pipe Velocity Based on Hydraulic Criteria Diameter (24 in Pipe Velocity Units' gPin inches) : fps :hes)b: fps Milestone Phase n 7,947 10.6 5.6 Ultimate 6,473 8.6 4.6 a) Unit abbreviation: gpm = gallons per minute. b) Using a friction factor of C = 120. Because the total headless difference between a 24-inch and 18-inch valve is relatively small, and the cost difference relatively larger, 18-inch valves are assumed for the four proposed new I/O port controls. Each I/O port would be protected from coarse suspended material by appropriate stainless steel screens. The arrangement of these screens is highlighted on Figure 4-2, and a photograph of similar I/O port screens at SMWD's Upper Oso Reservoir is shown on Figure 4-3. All valves would be hydraulically operated with control lines terminating in a proposed operations building at the reservoir's north side, as shown on Figure 4-1. A probable cost opinion of the modified I/O works is given in Table 4-2. Aeration/Destratification System. A body of water like Mahr Reservoir, several feet deep or more, will naturally tend to undergo thermal stratification. Because of solar heat load, upper and lower waters tend to become thermodynamically "separate" with respect to uniform mixing. Upper waters tend to stay well mixed and aerobic, while lower waters become stagnant and anoxic. The latter environment, especially with chemicals present in recycled water, can promote hydrogen sulfide and other odiferous chemical production. With CMWD's climate, one stratification cycle per year will occur, with onset in spring, greatest stratification in late summer, natural mixing or "turnover" in fall, and well-mixed water in winter. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL& ASSOCIATES 4-5 Facility Alternatives Upper two I/O ports, looking east. Figure 4-3 Upper Oso Reservoir I/O Works An aeration system can perform substantial mixing of the reservoir volume and provide supplemental oxygen. This mixing can prevent or eliminate stratification, and its undesirable consequences, and even help control certain algae growth. Typical Southern California experience shows the system only needs to operate part of the day or a few days a week, and only during the spring-to-fall half of the year. A common system configuration, used in several reservoirs and lakes in San Diego and Orange Counties, includes an air compressor, usually housed in a small building for protection and sound attenuation; an air supply pipeline; and a diffuser pipeline, usually located 5-10 feet above the bottom near the deepest portion of the basin. Keeping this diffuser pipeline well submerged is one reason to establish a 12.5-foot deep minimum operating pool, discussed in Chapter 1. The operations building noted above could house both the I/O works valve controls and the aeration/destratification system's compressor. Location of these features is shown on Figure 4-1. A photograph of the proposed operations building site is provided as Figure 4-4. BEST COPY CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 4-6 f-i Facility Alternatives ^ ; ,-?- JTable4-2 Cost Opinion for Mahr Reservoir I/O Works ^ ••'*•' si; 1 •••••••MH^^MH**^^^^^™* " — • . Item Demolition Work Concrete Vault Excavation Backfill Concrete Shoring 24-Inch Steel Pipe w/Epoxy Coating Welding Joints 18xl8xl8-inch Tee w/Epoxy Coating 1 8-inch 90-degree Elbows w/Epoxy Coating 24x1 8-inch Reducer w/Epoxy Coating 24x24x 1 8-inch Tee w/Epoxy Coating Rexible Coupling 1 8-inch BFV w/ Hydraulic Cylinder Stainless Steel Wire Screen Hydraulic Accumulator System Pipe Support Miscellaneous Mctalwork Electrical/Instrumentation Sales Tax on Material Cost, 7.75 percent Mobilization & Demobilization, 3 percent Subtotal Construction Contractor OH&P Total Construction Contingency Subtotal Project Engineering & Administration Total Project Quantity No. 1 33 16 10 5 140 30 5 '"} I 4 2 5 4 1 20 1 1 Unit1 LS CY CY CY ton ft each each each each each each each each each each LS LS 20 percent 20 percent 15 percent Material Cost dollars Unit 0 40 40 200 600 . 115 315 900 950 680 1,730 500 5,000 3.500 32,000 250 3,500 12,000 Total 0 1320 640 2,000 3,000 16,100 9,450 4.500 950 680 6,920 1,000 25,000 14,000 32,000 5,000 3,500 12,000 Labor Cost dollars Unit 20,000 • 20 20 400 360 105' 33 '982 769 763 1(126 •650 2400 1.500. 41,000 500 1,558 5,900 Total 20,000 660 3204,666 " 1.800 14,700 990 4,910 769 ' 763 4^04 1300 12400 ' . 6,000 41,000 10.000 1458 5,900 Total Cost dollars" 20,000 1,980 960 .6000 4,800 30.800 10.440 9.41Q 1,719 ' 1.443 • U.424 2,300 37400 20,000 73,000 15,000 5.058 17,900 10,700 8,092 288,526 57,705 346,231 69,246 415,477 62,322 477,799 a) Unit abbreviations: LS = lump sum; CY = cubic yard. b) Cost for January 2000. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 4-7 Facility Alternatives Wide spot in access road, looking east over spillway. Figure 4-4 Proposed Mahr Reservoir Operations Building Site For durability and flexibility, the air supply and diffuser pipelines are assumed constructed of 4-inch diameter polyethylene piping. The diffuser pipeline would have small, appropriately-sized holes drilled approximately every five.feet for its entire length. This pipeline would be held in place, approximately parallel to the reservoir bottom, by a series of anchors that resist the pipeline's tendency to rise when charged with air. This type system has been operating at SMWD's Upper Oso Reservoir for approximately ten years. While other aeration/destratification systems are feasible, a probable cost opinion for the one described here, with costs adjusted from SMWD's experience, is presented in Chapter 5. Outflow Chlorination. Open seasonal storage generally degrades bacteriological water quality below those levels specified by Title 22, California Code of Regulations, for disinfected tertiary effluent at a treatment plant production source. The extent of degradation depends on the size of the drainage area tributary to the reservoir and the development characteristics of the drainage area. While not currently required by regulatory agencies, chlorination of reservoir outflow could be done to mitigate this degradation. Because of no regulatory requirement for outflow disinfection, the very small Mahr Reservoir tributary watershed area, and no predominant outflow chlorination practice elsewhere CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & AS1 Facility Alternatives specifically for disinfection, this candidate improvement is not considered further. It could be reconsidered for a future phase of work. Outflow Microscreening. Reusing the existing fine screens could provide some control of water quality, although distribution system algae problems still occurred during the original deployment. Such reuse w6uld involve improvements in situ at the Meadowlark WRF or equipment relocation to the Mahr Reservoir site. Some WRF process and related modifications could be required. A significant drawback to outflow microscreening is the need to break head. Mitigating this hydraulic disruption would require pumping designed for peak- hour flow rate and complex pump controls. In light of these disadvantages, and the years of several major recycled water storage reservoirs (see .Chapter 1) operating successfully without such treatment, this candidate improvement is not considered further. . If the need emerges to remove paniculate matter in reservoir outflow beyond that removal accomplished by the proposed I/O port screens, large and relatively inexpensive strainers of the type used by SMWD for Upper Oso Reservoir could . be deployed. These could be installed in-line, with no head break, on the existing 18-inch I/O line near where it emerges from the downstream dam toe. In normal operation such strainers involve a typical headloss of only a few pounds per square inch. Reservoir Lining and Covering. Lining and covering a reservoir can control algae growth and other water parameters. Two lining and covering alternatives were considered candidates for Mahr Reservoir: Q Alternative A - a floating cover with a geo-membrane liner a Alternative B - a floating cover with a porous asphaltic-cement (AC) liner The geometric configuration of the existing reservoir was reviewed for compatibility with the two commonly used systems for maintaining tension on a floating cover: weight-tensioning and mechanical-tensioning. Weight-tensioned floating covers are distinguished by a series of strategically located trough weights and floats attached to the floating cover to take up excess material and keep the floating cover taut. These trough weights create a fold where excess material accumulates and that also serves as a rainwater collection trough. Rain falling on the floating cover migrates into the troughs and is removed by a rainwater removal system, consisting of pumps or gravity drain assemblies. With mechanically-tensioned floating covers, cables are attached to the floating cover and connected to a counter-weight and pulley system to maintain floating cover tension. The counterweights are housed in a number of small individual towers surrounding the reservoir perimeter. The rainwater removal system CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 4-9 Facility Alternatives typically consists of pumps or gravity drains placed on the floating cover to: remove surface water. Both these cover systems have very similar estimated unit costs. The reservoir site can be reconfigured to suit either cover system; however, the mechanically- tensioned cover system would only be practical if the operating water level of the reservoir was restricted to the upper 15 feet of its range. A weight-tensioned cover system would allow the full operating range in the existing reservoir to be used. Therefore, for this evaluation, a weight-tensioned cover system, with 45- mil polypropylene cover material.and full perimeter sump, is considered for budget pricing of both lining and covering alternatives. Recommended impermeable geo-membrane liners for this application include a 45-mil polypropylene liner or a 60- to 90-rnil high-density polyethylene (HDPE) liner. HDPE liners are cheaper, but have a higher coefficient of thermal expansion, making installation and maintenance more. complicated. For this evaluation, the 45-mil polypropylene liner is considered for budget pricing for Alternative A. It is anticipated that the addition of an impermeable geo-membrane would require careful review by a geotechnical engineer and DSOD. Key items for consideration by DSOD would be potential loss of soil moisture in the dam embankment, under-drain piping and under-drain relief piping. The loss of moisture in the dam embankment could be significant as the dam core appears to be constructed with clay, based on available record drawings. It is likely the under-drain relief piping could require penetrating the dam embankment to discharge under-drain flows. Other items that are typically part of an existing reservoir retrofit with a floating cover and a geo-membrane liner include: o A means to anchor the edge of the liner o Appurtenances such as vents, access hatches, and inflation ports a A rainwater relief system A probable construction cost opinion for adding a floating cover and geo- membrane liner to Mahr Reservoir is shown in Table 4-3. The costs for the basic appurtenances described above are included in the unit cost for the cover and are based on past experience with similar projects. As described above, it is anticipated that a geo-membrane liner system may not be compatible with the existing dam embankment and would require considerable review by DSOD. Therefore, porous AC liner system, Alternative B, was reviewed as another method for lining the reservoir. This type of liner system would not require an under-drain system and under-drain relief piping. This alternative would likely reduce requirements for DSOD permitting. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 4-10 Facility Alternatives . > - ^ Table 4-3 Cost Opinion forlTinirig and jCovering Mahr Reservoir ; • • | Item1 Porous AC Liner Polypropylene Liner Underdrain (in reservoir) Underdrain (through embankment) Base" Polypropylene Cover & Appurtenances0 Concrete Ringwall Appurtenances Excavation* Subtotal Construction Contractor OH&P Total Construction Contingency Subtotal Project Engineering & Administration Total Project Quantity' 385,000 385,000 1,600 500 115,500 350,000 2,900 1 20 percent 20 percent 15 percent Unit Cost Sl/SF Sl/SF $25/LF . $40/LF S0.75/SF S2.10/SF $40/LF LS Total Cost, dollars' Alternative A N/A 385,000 40,000 20,000 86,625 735,000 116,000 100,000 1,482,625 296,525 1,779,150 355,830 2,134,980 320,247 2,455,227 Alternative B 385,000 N/A N/A N/A . 86,625 735,000 116,000 100,000 1,422,625 284,525 1,707,150 341,430 2,048,580 307,287 2355,867 a) This estimate only includes costs for work associated with the liner and cover. Costs for inlet and outlet structures, minor concrete, and other miscellaneous work have not been included. b) Base quantity assumes a bottom area with 6" thick decomposed granite base. Type and cost of base may change based on a detailed geotechnical evaluation. c) Appurtenances include vents, access hatches, inflation ports, and rainwater relief system. d) Excavation cost may change based on actual site conditions and method of excavation. e) Volume = 160 AF, surface area = 350,000 square feet (SF), bottom area = 385,000 SF, perimeter = 2,900 linear feet. f) Cost for January 2000. A probable cost opinion for adding a floating cover with a porous AC liner to Mahr Reservoir is also shown in Table 4-3. The cost for basic appurtenances described above are also included in the unit cost for the cover. These costs are based on past experience with similar projects and accepted cost references. In order to install either alternative lining and covering system, the existing reservoir would require draining, debris/sludge removal, dewatering and remedial grading to reconfigure the side slopes and reservoir bottom. Prior to liner system installation, base material would be placed as recommended by a geotechnical engineer. For the purposes of this evaluation, allowances have been made for excavation and installation of base material, based on similar projects. , Operation and maintenance costs for a floating cover and liner system depend somewhat on liner alternative. These can be estimated if a decision is made to pursue either lining and cover alternative further. As shown in Table 4-3, Alternatives A and B have comparable costs; however, Alternative B would not require a possible change to the design intent of the dam embankment nor would it require a piping penetration through the embankment for under-drain relief. For these reasons, it is believed that the Alternative B CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 4-11 Facility Alternatives would be easier to design, permit and maintain. Based on results of this evaluation, the floating cover with a porous AC liner is considered further in Chapter 5. Miscellaneous Site Work. Other more minor site improvements may be required in addition to the major ones previously discussed. These items could include improving site access roadways, adding selective landscape treatment, and installing a protective surface on the upstream dam face. The latter could be accomplished with AC pavement, which would mitigate erosion as well as decrease "foothold" for rooted aquatic vegetation. A lump cost opinion is provided for these items in Chapter 5. Alternative Combinations of Improvements Two types of facility alternatives are defined: using or not using Mahr Reservoir in the planned recycled water system; and, if the decision is to use Mahr Reservoir, selecting the best combination of facility improvements. To make a fair comparison when Mahr Reservoir is not to be used, equivalent seasonal, operational, and emergency supply components must be considered. These could include additional peak-month supply capacity and an above-ground operational storage reservoir, respectively. These alternatives and cost opinions thereof are discussed in Chapter 5. The long-term history of other recycled water seasonal storage reservoirs, discussed in Chapter 1, argues strongly against the need for a lining and covering system at Mahr Reservoir. Given that and the relatively large cost of lining and covering systems, two combinations of improvements are considered. The first combination involves the following improvements: a Dredging and cleaning the reservoir bottom a Modifying the I/O works a Adding an aeration/destratification system a Performing miscellaneous site work. The second combination involves all the above plus adding lining and covering. Since Mahr Reservoir has a very small tributary watershed area, the first combination of improvements should provide adequate water quality. Dredging and cleaning, and use of aeration/destratification will tend to maintain an aerobic environment throughout the reservoir water column throughout the year. This will tend to eliminate hydrogen sulfide production and other unpleasant odors. Multiple ports in a modified I/O works will tend to allow best quality water stratum selection. Since algae grow largely near the reservoir water surface, this will tend to greatly minimize the likelihood of algae being moved into the distribution system. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 4-12 Facility Alternatives An additional reason, besides cost, exists for deferring further consideration for reservoir lining and covering. In 1997 the State Department of Health Services published a comprehensive evaluation of reservoir lining and covering systems. Their primary focus was a sanitary assessment with respect to potable water storage and quality. However, they noted some generic concerns that would be relevant to application with high-quality recycled water as planned by CMWD: a Cover materials are "vulnerable to puncture" and "slashes," as from vandalism, and cover seams are "potential weak spots that can compromise the watertight integrity" Q Drainage systems used to remove accumulated rainwater are "not reliable" o Many of the agencies that have installed lining and covering systems "have attempted to establish... a (maintenance) program but found this process to be exceedingly difficult, labor intensive, and expensive." CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 4-13 Chapter 5 Alternative Costs and Phasing 'o.',, • "•,.--- .-t ---- " , ; - ' '•' _ '" ' ' * < •-'• •< ' %^ Mahr Reservoir Use Benefits Mahr Reservoir can provide seasonal, operational (diurnal), and emergency storage to CMWD's recycled water production and distribution system. Seasonal and emergency storage benefits are quantified in Chapter 3. Absent Mahr Reservoir, CMWD's system would need equivalent peak-month supply capacity. This would require, for comparative analysis, a marginal increase in peak-month supply from the Carlsbad AWT facility, according to the flow rates given in Table 3-3. From an. operational storage perspective, Mahr Reservoir is favorably located geographically and topographically. It provides a storage volume well suited to service demand along Rancho Santa Fe Road, both north and south of the reservoir site, and it could back-feed flow into the lower distribution system pressure zone. The reservoir is also at a key elevation for establishing the hydraulic grade line in the nearby portion of the distribution system. Absent Mahr Reservoir, the system would need equivalent operational storage capacity. This would require, for comparative analysis, an alternative 1.5-MG reservoir at a site in the vicinity near elevation 550 feet. From an emergency storage perspective, Mahr Reservoir's volume could offset a loss of supply at one of the regular production sources for a given period of time. The appropriate volume would vary depending on total system production capacity available, demand on the distribution system, volume of water in the reservoir, and time of year. For example, if a supply outage occurred in the peak demand month, the volume withdrawn for emergency supply offset would directly eliminate a corresponding volume of peak-month seasonal storage. Emergency storage remains a benefit for Mahr Reservoir, but it is difficult to quantify monetarily. Sample volumetric approximations are given at the end of Chapter3. Another possible benefit of Mahr Reservoir relates to ocean outfall capacity. During the winter, Encina WPCF may incur hydraulic limitations in peak wet- weather treated wastewater disposal capacity. Water reclamation, via the CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 5-1 Alternative Costs and Phasing proposed Carlsbad AWT facility, could remove some flow from the disposal stream. Because of low winter demand, such excess recycled water would have to be .stored. However, according to the analyses included in Appendix B, even in the current condition, Mahr Reservoir's volume is relatively small and would not necessarily take enough flow in the winter to save significant treated wastewater disposal capacity in the ocean outfall system. Appropriate estimations of realistic volumes wbuld require more detailed modeling of Encina WPCF and are beyond this evaluation's scope. Therefore, no benefit is quantified for this function. Comparative Improvement Costs For Phase n cost comparison, Alternative 1 includes use of Mahr Reservoir and all the facility improvements summarized at the end of Chapter 4. Alternative 2 replaces Mahr Reservoir with an equivalent new 1.5-MG, above-ground, steel, operational storage reservoir on a newly-purchased site; and 1.46-MGD additional peak-month equivalent supply capacity (see Table 3-3), assumed as a marginal increase to planned Carlsbad AWT expansion capacity. Table 5-1 shows resulting capital costs by line item and totals. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES Alternative Costs and Phasing ; ; Table^l Comparative Costs for Mahr Reservoir Phase II Capacity Value -:<; 1 Item With Mahr Reservoir Dredging & Cleaning* Modified I/O Works' Aeration/Destratification System* Lining and Covering11 Miscellaneous Site Work* Without Mahr Reservoir New Oper. Storage Res. Site* New Oper. Storage Res. Construction0 Additional Peak-Mdnth Plant Capacity11 Subtotal Construction Contractor OH&P Total Construction Contingency Subtotal Project Engineering & Administration Total Project Quantity 1 1 1 160 AF . 1 1 acre 1.5MG 1.46MGD 20 percent 20 percent 15 percent Unit Cost lump sum lump sum lump sum lump sum lump sum lump sum 413,000 1,167,000 Total Cost, dollars' Alternative lr 150,000 289,000 166,000 1,423,000 175,000 N/A N/A N/A 2,203,000 441,000 . 2,644,000 529,000 3,173,000 476,000 3,649,000 Alternative 2* N/A N/A N/A N/A N/A 100,000 620,000 1,704,000 2,424,000 485,000 . 2,909,000 582,000 3,491,000 524,000 4,015,000 a) Preliminary estimate, b) Cost based on lining and covering Alternative B . c) Volume sized per final distribution system analysis. d) Capacity based on Chapter 3 analysis, shown in Table 3-3; cost based on incremental capital improvements in Preliminary Design Report for the Carlsbad Water Recycling Facility. e) Cost for January 2000; assumes remainder of recycled water supply and distribution costs for a total Phase II system at 5,400 AFY is the same for both alternatives. f) Assumes Mahr Reservoir improved for use as operational and seasonal storage. g) Assumes equivalent operational storage and peak-month supply capacity obtained without Mahr Reservoir. At this estimating level, Alternative 1's total project cost is slightly less than Alternative 2's total project cost. Alternative 2's total project cost would change a small amount if a different capacity operational storage reservoir were used and if a different plant capacity were chosen. More significantly, Alternative 2's total project cost would increase for the ultimate condition, while Alternative 1's total project cost would not. In that condition, an estimated 3.5 MG of alternative operational storage and a total additional peak-month plant capacity of 1.62 MGD (see Table 3-3) would be needed, which would increase Alternative 2's total project cost by approximately $1,842,000, as shown in Table 5-2. Considering these additional costs to Alternative 2 and the monetarily unquantified emergency storage benefit of Alternative 1, Alternative 1 appears the least-cost capital option. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 5-3 Alternative Costs and Phasing ; • : Table 5-2 'Comparative Costs for Mahr Reservoir Ultimate Capacity Value ^ ?^- 1 Item With Mahr Reservoir Per Table 5-1 Without Mabr Reservoir New Oper. Storage Res. Site* New Oper. Storage Res. Constructionb Additional Peak-Month Plant Capacity0 Subtotal Construction Contractor OH&P Total Construction Contingency Subtotal Project Engineering & Administration Total Project Quantity 1 2 acres 3.5 MG 1.62 MGD 20 percent 20 percent 15 percent Unit Cost lump sum lump sum 413,000 1,167,000 Total Cost, dollars'1 Alternative 1* 2,203,000 N/A N/A N/A 2,203,000 441,000 2,644,000 529,000 . 3,173,000 476,000 3,649,000 Alternative 2f N/A 200,000 1,446,000 1,891,000 3,537,000 707,000 4,244,000 849,000 5,093,000 764,000 5,857,000 a) Preliminary estimate, b) Volume estimated from ratio of ultimate to Phase JJ demands, c) Capacity based on Chapter 3 analysis, shown in Table 3-3; cost based on incremental capital improvements in Preliminary Design Report for the Carlsbad Water Recycling Facility. d) Cost for January 2000; assumes remainder of recycled water supply and distribution costs for a total ultimate system at 9,800 AFY is the same for both alternatives. e) Assumes Mahr Reservoir improved for use as operational and seasonal storage. f) Assumes equivalent operational storage and peak-month supply capacity obtained without Mahr Reservoir. Operating costs for Mahr Reservoir would be relatively minor, and probably comparable to those associated with Alternative 2. They are not considered herein because they would not be expected to affect the decision. Improvement Phasing If lining and covering were deleted from Alternative 1, the resulting total cost would be substantially less than the .cost for any version of Alternative 2. Alternative 1 could be phased, with initial Mahr Reservoir improvements for Phase II including all items except lining and covering, which would be deferred as discussed in Chapter 4. These Phase H reservoir improvements could be tested for several years before reconsidering the need for additional reservoir improvements. If lining and covering were needed, it could be constructed as part of a Phase IQ system expansion. Based on Table 5-1, the total project cost opinion for initial reservoir improvements under Alternative 1 is shown in Table 5-3. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 5-4 Alternative Costs and Phasing .>:>• :-:-• -Table 5-3 Cost Opinion for Initial Mahr Reservoir Improvements3^ > " 1 Item Dredging & Cleaning Modified I/O Works Aeration/Destratification System Miscellaneous Site Work Subtotal Construction Contractor OH&P Total Construction Contingency Subtotal Project Engineering & Administration Total Project Quantity 1 1 1 1 20 percent 20 percent 15 percent Unit Cost lump sum lump sum lump sum lump sum Total Cost 1 dollars 150,000 289,000 166,000 175,000 780,000 156,000 936,000 187,000 1,123,000 ' . 168,000 1,291,000 a) All entry notes same as for Table 5-1. CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 5-5 c Recommendations Facilities In light of the foregoing evaluation and related ongoing preliminary design of CMWD's recycled water distribution system, the following recommendations are made to CMWD regarding Mahr Reservoir. o Proceed with acquisition of rights from VWD to improve and use the reservoir on a long-term basis o Phase reservoir improvements as delineated in Chapter 5, with further consideration for a liner and cover deferred to system expansion Phase HI o Design and construct all initial reservoir improvements in parallel with other Phase II system expansion improvements o Once the improved reservoir is placed in service, test its performance for several years before reconsidering the need for additional improvements. Monitoring Program To properly test performance of an improved Mahr Reservoir, an adequate monitoring program will need to be initiated. Such a program typically requires use of a boat for sample acquisition and use of a portable analyzer to measure common limnetic parameters at different depths. Table 6-1 illustrates a typical program, with samples collected in the water column between the existing reservoir I/O works and the upstream dam toe. Daily sample timing would depend on operating times of the proposed aeration/destratification system and any specific regulatory requirements. Parameter Dissolved Oxygen Temperature PH Electrical Conductivity Oxidation-Reduction Potential Turbidity Coliform General Mineral Method Analyzer Analyzer Analyzer Analyzer Analyzer Analyzer Grab Grab Depth Every 5 feet Every 5 feet Every 5 feet Every 5 feet Every 5 feet Every 5 feet Top Top and Bottom Frequency Monthly Monthly Monthly Monthly Monthly Monthly Monthly Quarterly CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES 6-1 Recommendations At the program's onset, similar samples could be collected at a few other locations around the reservoir, to verify that the recommended sample location is adequately representative of the entire water body. \\NTSEIIVEK\SHARfD.FIL\PROIECT5\PiwilL307VCvbbail Ph II OOIMU.crvoirMilahcmrvjJ.Doc CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES Appendix A HISTORICAL RECYCLED WATER DEMANDS CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES A-1 CMWD Recycled Water System Historical Monthly Recycled Water Demands" (acre-feet), 1995-1999 Year 1995 1996 1997 1998 1999 Average Use Ratio" Use Ratio*1 Use Ratio1' Use Ratio*1 Use Ratio11 Simple Adjusted1' Jan 18.26 0.20 33.93 0.32 11.24 0.10 14.22 0.13 15.00 0.10 0.17 0.11 Fcb 10.65 0.12 12.11 0.12 34.59 0.31 22.29 0.20 55.38 0.38 0.22 0.16 Mar 9.54 0.10 16.70 0.16 108.29 0.96 50.91 0.46 64.71 0.44 0.43 0.37 Apr 42.04 0.46 89.48 0.85 132.47 1.18 90.73 0.82 143.92 0.98 0.86 0.82 May 89.83 0.99 152.55 1.45 181.82 1.62 161.27 1.45 204.23 1.39 1.38 1.37 Jim 127.00 1.40 223.57 2.13 215.65 1.02 228.75 2.06 190.64 1.30 1.76 1.83 Jul 149.24 1.64 198.31 1.89 179.32 1.60 191.74 1.73 332.49 2.26 1.82 2.10 Aug 193.48 2.13 203.14 1.94 171.35 1.53 208.43 1.88 183.97 1.25 1.74 1.76 Scp 181.99 2.00 158.07 1.51 152.62 1.36 158.65 1.43. 188.02 1.28 1.52 1.51 Oct 128.61 1.41 130.26 1.24 1 10.35 0.98 103.86 0.94 146.19 1.00 1.11 1.09 Nov 78.10 0.86 29.78 0.28 24.06 0.21 33.23 0.30 100.79 0.69 0.47 0.42 Dec 62.08 0.68 10.93 0.10 26.26 0.23 68.39 0.62 136.37 0.93 0.51 0.46 Totals 1,090.82 1,258.83 1,348.01 1.332.46 1.761.71 1,358.37 Average 90.90 104.90 1 12.33 111.04 146.81 113.20 Factors' P/A 2.13 2.13 1.92 2.06 2.26 2.10 2.10 M/A 0.10 0.10 0.10 0.13 0.10 0.11 0.11 a) Based on actual CMWD metered demands. b) Annual monthly demand variation expressed as a ratio of actual monthly demand divided by the average monthly demand for that year. c) Demand factors include peak-to-average (P/A) month and minimum-to-avcrage (M/A) month. d) See report text for explanation. F:VPro|ects\Powen.207\Carlsbad Ph H.001\Reservoir\RevMoSDS - Demands 5/31/00 Appendix B SEASONAL STORAGE MODEL RUNS CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES B-l Analysis of Monthly Supply/Demand/Storage Requirements PROJECT: CMWD Recycled Water System Expansion SCENARIO 1 A: With Full Seasonal Storage SUPPLY: RW=1.61 mgd; Other=0 mgd DEMAND: Current O 1,800 ac-tt/yr 0 ac-ft existing seasonal storage, 548 ac-fl required seasonal storage f. _ Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TOTAL Evapo- Seasonal transplr., Precip., Variation in In Ratio n/a n/a 0.11 n/a n/a 0.16 n/a n/a 0.37 n/a n/a 0.82 n/a n/a 1 .37 n/a n/a i .83 n/a n/a 2.10 n/a n/a 1.76 n/a n/a . 1.51 n/a n/a 1.09 n/a n/a 0.42 n/a n/a 0.46 n/a n/a 12.00 Project Other Total Demand, Demand, Demand, ac-tt c ac-tt ac-tt 16 0 16 24 0 24 56 0 56 123 0 123 205 0 205 275 0 275 315 0 315 264 0 264 226 0 226 163 0 163 63 0 63 70 0 70 1.800 0 1,800 RW Other Total Supply, Supply, Supply, ac-tt ' ac-tt ' ac-tt 150 0 150 150 0 150 150 0 150 150 0 150 150 0 150 150 0 150 150 0 150 150 0 150 150 0 150 150 0 150 150 0 150 150 0 150 1,800 0 1.800 Reser. Re*er. Unused Flow, Storage, RWSupp., ac-tt ' ac-tt • tc-tt 134 302 79 126 427 79 94 521 79 27 548 79 (55) 493 79 (125) 368 79 (165) 203 79 (114) 89 79 (76) 13 79 (13) 0 79 87 87 79 80 168 79 0 946 INPUT a) n/a * etiectlve/iotal precipitation ratio (no units) b) n/a «irrigation efficiency (no units) c) 1.800 « annual project irrigation demand, (ac-tt/yr) d) 2.45 = maximum recycled water supply available (mgd; e) 0.00 = maximum other water supply available (mgd; I) 3.00 = maximum reservoir Inflow allowed (mgd) 3.00 « maximum reservoir outflow allowed (mgd) g) 1,000 = maximum reservoir working storage available (ac-tt) OUTPUT 1) 2.10 -peak month factor (no units) 2) n/a c irrigation application rale (ft/yr) 3) 1.800 = annual total demand (ac-ft/yr) 4) 1.00 m total supply/demand ratio (no units) 5) . Jul • maximum irrigation demand month 6) Jan x minimum irrigation demand month 7) 1.61 • maximum RW supply used (mgd) B) 0.00 » maximum other supply used (mgd) 9) 1.43 * maximum reservoir inflow used (mgtiy 10) 1.77 e maximum reservoir outflow used (mgd) 11) 548 B maximum reservoir working storage used (ac-fl) Monthly Supply / Demand j«n F«b Mar Apr M«y Jun Jul Au9 S.P Oo No. 0« Monthly Reservoir / Unused RW Supply Jan Fee Mar Apr May Jun Jul Aug S*p Oct Nov OK FAPrcj«C»Vow«l1.20T«arls*»d Ph ll.001\ReMrvoil\R«vMoSOS • lA-Curr«nl S/31/00 Analysis of Monthly Supply/Demand/Storage Requirements PROJECT: CMWD Recycled Water System Expansion SCENARI01B: With No Seasonal Storage SUPPLY: RW=2.45 mgd; Other«0.92 mgd OEMAND: Current 9 1,800 ac-ft/yr >. FORAGE: 0 ac-ft existing seasonal storage, 0 ac-tt required seasonal sto Month Jan Peb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TOTAL Evapo- Seasonal transplr., Preclp., Variation in In Ratio n/a n/a 0.1 1 n/a n/a 0.16 n/a n/a 0.37 n/a n/a 0.82 n/a n/a 1.37 n/a n/a 1.83 n/a n/a 2.10 n/a n/a 1.76 n/a n/a 1.51 n/a n/a 1-09 n/a n/a 0.42 n/a n/a 0.46 n/a n/a 12.00 Project Other Total Demand, Demand, Demand, ac-ft c ac-ft ac-ft 16 0 16 '24 0 24 56 0 56 123 0 123 205 0 205 275 0 275 315 0 315 264 0 264 226 0 226 163 0 163 63 0 63 70 . 0 70 1,800 0 1,800 rage RW Other Total Supply, Supply, Supply, ac-tt " ac-tt* ac-ft 16 0 16 24 0 24 56 0 56 123 0 123 205 0 205 229 46 275 229 86 315 229 ' 35 264 226 0 226 163 0 163 63 0 63 70 0 70 1.633 167 1,800 Reser. . Reser. Unused Flow, Storage, fcWSupp., ac-ft1 ac-ft9 »c-ft 0 0 213 0 0 204 0 0 173 0 0 105 0 0 24 000 (0) (0) 0 0 (0) 0 0 (0) 3 0 0 65 0 0 166 0 0 159 (0) 1,113 INPUT a) n/a = effective/total precipitation ratio (no units) b) n/a «irrigation efficiency (no units) c) 1,800 » annual project irrigation demand (ac-tt/yr) d) 2.45 = maximum recycled water supply available (mod; e) 1.00 = maximum other water supply available (mgd; I) 0.00 «rnaximum reservoir inflow allowed (mgd) 0.00 » maximum reservoir outflow allowed .(mgd) g) 0 -maximum reservoir working[storage available (ac-lt) ouTpyr 1) 2.10 « peak month factor (no units) 2) n/a B irrigation applcation rate (ft/yr) 3) 1,800 • annual total demand (ac-ft/yr) 4) 1.00 - total supply/demand ratio (no units) 5} Jul * maximum Irrigation demand month 6) Jan « minimum irrigation demand month 7) 2.45 • maximum RW supply used (mgd) 8) 0.92 * maximum other supply used (mgd) 9) 0.00 * maximum reservoir inflow used (mgd) 10) 0.00 « maximum reservoir outflow used (mgd) 11) 0 « maximum reservoir working storage used (ac-tt) Monthly Supply / Demand ( ». 5 100 so 0 ;a 1 ' I rm nil Jin Fib Mar j i? ^ 1 i i * ! -: i. f ODimeno • Supctfy I ifi-iT iHII Apr May Jun Jul Aug S*p Oci Nov O«c Month Monthly Reservoir / Unused RW Supply 2SO 200 f 150 4- Jin Fmb Mar Apr May Jun Jul Aug S«p Oct Nw Oae 100 f 50 f F:\Proi»ct»VPo««ll.207\Cirl5t>ael Pn II.OOIWeHrvoiABevMoSDS • 1 B-Currtm Analysis of Monthly Supply/Demand/Storage Requirements PROJECT: CMWD Recycled Water System Expansion SCENARIO 1C: With Mahr Reservoir Seasonal Storage SUPPLY: RW=2.45 mgd; Other=0.l7 mgd DEMAND: Current® 1.800 ac-ft/yr k FORAGE: 0 ac-tt existing seasonal storage, 151 ac-ft required seasonal storage Month Jan Feb Mar Apr May Jun Jul Aufl Sep Oct Nov Dec TOTAL Evapo- Seasonal transpir., Precip., Variation In In Ratio n/a n/a 0,1 1 n/a n/a 0.16. n/a n/a 0.37 n/a n/a 0.82 n/a n/a 1.37 n/a n/a 1.83 n/a n/a 2.10 n/a n/a 1.76 n/a n/a 1.51 n/a n/a 1.09 n/a n/a .0.42 n/a n/a 0.46 n/a n/a 12.00 Project Other Total Demand, Demand, Demand, ac-tt ' ac-tt ac-tt 16 0 16 • 24 0 24 56 0 56 123 0 123 205 0 205 275 0 275 315 0 315 264 0 264 226 0- 226 163 0 163 63 0 63 70 0 70 1,800 0 1,800 RW Other Total Supply, Supply, Supply, ac-ft' ac-tt' ac-tt 92 0 92 100 0 100 56 0 56 123 0 123 205 0 205 229 0 229 229 16 245 229 0 229 226 0 226 163 0 163 63 0 63 70 0 70 1,784 16 1,800 Reser. Reser. Unused How, Storage, RWSupp., ac-ft1 ac-ft' ic-ft 76 76 137 76 .151 129 0 151 173 0 151 105 0 151 24 (46) 105 0 (70) 35 0 (35) 0 0 0 03 00 65 0 0 166 0 0 159 (0) 962 INPUT a) rVa = effective/total precipitation ratio (no units) b) n/a = irrigation efficiency (no units) c) 1,800 « annual project irrigation demand (ac-ltfyr) d) 2.45 » maximum recycled water supply available (mgd; e) 0.00 • maximum other water supply available (mgd; I) 3.00 K maximum reservoir Inflow .allowed (mgd) 3.00 K maximum reservoir outflow allowed (mgd) g) 151 • maximum reservoir working storage available (ac-tt) OUTPUT 1) 2.10 speak month factor (no units) 2) n/a .irrigationapplication rate (tt/yr) 3) 1,800 = annual total demand (ac-tt/yr) 4) 1.00 »total supply/demand ratio (no units; 5) Jul a mixlmum irrigation demand month 6) Jan » minimum irrigation demand month 7) 2.45 « maximum RW supply used (mgd) B) 0.17 « maximum other supply used (mgd) 9) 0.81 s maximum reservoir inflow used (mgd) 10) 0.75 * maximum reservoir outflow used (mgd) 11) 151 = maximum reservoir working storage used (ac-tt)Volume, acre-feeto S 8 S 8 £Monthly Supply / Demand if•'; \ \ \\ Jan Fab Mar 1 > I - _ \ "i j 'i aoarnam) •Supply L_ 1 Hi 1 Jim Apt May Jun Jul Aug Sap Del Nw Month DK 1 Monthly Reservoir / Unused RW Supply 200 Jan Fib Mir Apt May Jun Jul Aug S*p Od Nov D« F:\Projects\Povitll.207\CarUbsd Ph H.001\Rewrvoir\RavMoSOS. 1C-Curt*nt 5/31/00 Analysis of Monthly Supply/Demand/Storage Requirements PROJECT: CMWD Recycled Water System Expansion SCENARIO 2A: With Full Seasonal Storage SUPPLY: RW=4.82 mgd; Other=0 mgd HEMAND: Phase II « 5,400 ac-ft/yr fORAGE: 0 ac-ft existing seasonal storage, 1,644 ac-ft required seasonal storage Month Jan Feb Mar Apr May Jun Jul Aug Sep Ocl Nov Dec TOTAL Evapo- Seasonal transplr., Preclp., Variation In in Ratio n/a n/a O.i 1 n/a n/a 0.16 n/a n/a 0.37 n/a n/a 0.82 n/a n/a 1.37 n/a n/a 1.83 n/a n/a 2.10 n/a n/a 1-76 n/a n/a 1.51 n/a n/a 1.09 n/a n/a 0.42 n/a n/a 0.46 n/a n/a 12.00 Project Other Total Demand, Demand, Demand, ac-ft e ac-ft »c-ft 49 0 ' 49 73 0 73 168 0 168 370 0 370 615 0 615 824 0 824 945 0 945 791 0 791 678 0 678 490 0 490 188 0 188 209 0 209 5,400 0 5.400 RW Other Total Supply, Supply, Supply, ac-ft ° ac-ft * ac-ft 450 0 450 450 0 450 450 0 450 450 0 450 450 0 450 450 0 450 450 0 450 , 450 0 450 450 0 450 450 0 450 450 0 . 450 450 0 450 5,400 0 5,400 Reser. . Recer. Unused Flow, Storage, RWSupp., •c-ft ' ac-ft * ic-ft 401 905 297 377 1,282 297 282 1,564 297 80 1.644 297 (165) 1.479 297 (374) 1.104 297 (495) 609 297 (341) 268 297 (228) 40 297 (40) 0 297 262 262 297 241 503 297 (0) 3.565 INPUT a) n/a « effeaivertotal precipitation ratio (no units) b) n/a = irrigation efficiency (no units) c) 5,400 * annual project irrigation demand (ac-H/yr) . d) 8.00 = maximum recycled water supply available (mgd; e) 0.00 .maximum other water supply available (mgd; I) 8.00 « maximum reservoir inflow allowed (mgd) 6.00 - maximum reservoir outflow allowed (mgd) g) 2,000 « maximum reservoir working storage available (ac-ft) OUTPUT 1) 2.10 = peak month factor (no units) 2) n/a • irrigation application rate (tl/yr) 3) 5,400 .annual total demand (ac-tt/yr) 4) 1.00 «total supply/demand ratio (no units; 5) Jul s maximum Irrigation demand month 6) Jan » minimum irrigation demand month 7) 4.82 » maximum RW supply used (mgd) B) ' 0.00 - maximum other supply used (mgd) 9) 4.30 « maximum reservoir inflow used (mgd) 10) 5.30 - maximum reservoir outflow used (mgd) 11) 1,644 m maximum reservoir working storage used (ac-tt) Monthly Supply / Demand Jin F«b Mar Apr M»» Jun Jul Aug S«p On N<* 0«c Monthly Reservoir/ Unused RW Supply 1,800 ••-•-•-•--ve/- Jan Fat) Mar Apr May Jun Jul Aug S«p Oa Nov D»c Month F:\Prcj«u>1Pw«ll.207\Carl»tad Ph ll.001W«wrvoir\R«vMoSOS • 2A-PMMII 5O1/OO Analysis of Monthly Supply/Demand/Storage Requirements PROJECT: CMWD Recycled Wattr System Expansion SCENARIO 2B: With No Seasonal Storage SUPPLY: RW«8.00mgd;Others2.12mgd OEMAND: Phase II O 5,400 ac-ft/yr ^ FORAGE: 0 ac-ft existing seasonal storage, 0 ac-ft required seasonal storage Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TOTAL Evapo- Seasonal transpir., Preclp., Variation In in Ratio n/a n/a 0:11 n/a n/a 0.16 n/a n/a 0.37 n/a rVa 0.82 n/a n/a 1.37 'rVa n/a 1.83 n/a n/a 2.10 n/a n/a 1.76 n/a n/a 1.51 n/a n/a 1.09 n/a n/a 0.42 n/a n/a 0.46 n/a n/a 12.00 Project Other Total Demand, Demand, Demand, ac-ft c ac-ft ac-ft .49 0 49 73 0 73 168 0 168 370 0 370 615 0 615 824 0 824 945 0 945 791 0 791 678 0 678 490 0 490 188 0 188 209 0 209 5,400 0 5,400 RW Other Total Supply, Supply, Supply, ac-tt' ac-ft* ac-ft 49 0 49 73 0 73 168 0 168 370 0 370 615 0 615 747 77 824 747 198 945 747 44 791 678 0 678 490 0 490 188 0 188 209 0 209 5,081 319 5,400 Reser. Reser. Unused Flow, Storage, RWSupp., ac-ft' ac-tt8 ac-tt 0 0 699 0 0 6741' 0 O 579 0 0 377* 0 0 132 (0) (0) 0 (0) (0) 0 0 (0) 0 0 (0) 69 0 0 257 0 0 559 0 0 538 (0) 3,885 INPUT a) n/a * eflectrveAotal precipitation ratio (no units) b) n/a «Irrigation efficiency (no units) c) 5.400 = annual project Irrigation demand (ac-ft/yr) . . d) 8.00 « maximum recycled water supply available (mgd; e) 2.00 « maximum other water supply available (mgd: I) 0.00 .maximumreservoirintlowaltowed(mod) 0.00 « maximum reservoir outflow allowed (mgd) g) 0 « maximum reservoir working storage available (ac-ft) OUTPUT 1) 2.10 * peak month factor (no units) 2) n/a • irrigation application rate (ft/yr) 3) 5,400 • annual total demand (ac-tt/yr) 4) 1.00 • total supply/demand ratio (no units', 5) Jul * maximum Irrigation demand month 6) Jan * minimum Irrigation demand month 7) 8.00 • maximum RW supply used (mgd) 8) 2.12 « maximum other supply used (mgd) 9) 0.00 « maximum reservoir inflow used (mgd) 10) 0.00 » maximum reservoir outflow used (mgd) 11) 0 » maximum reservoir working storage used (ac-ft) Monthly Supply / Demand "5 600 • "„ 500 • 1 «»J 40O > 300 200 100 0 PI' FB.ri.H, | r — 'e '- DD«n • Sup unrfl- piy L " ^ t 5 • V< : > Jin F«6 M»i Apr M«y Jun Jul Aug S«p Ocl Month •BE NOV nf Dec Monthly Reservoir / Unused RW Supply 600 Jin Fib Mai Apr May Jun Jul Aug Sep Oct Nov OK F:\Proj«cts\Pow«ll.207\Carts!>ad Ph ll.001\H«MrvoirtB»vMoSOS • 2B-Pha*« H 5/31)00 Analysis of Monthly Supply/Demand/Storage Requirements PROJECT: CMWD Recycled Water System Expansion SCENARIO 2C: With Mahr Reservoir Seasonal Storage SUPPLY: RW=8.00 mgd; Otner=0.66 mgd HEMAND: Phase II 9 5,400 ac-ftfyr It FORAGE: 0 ac-ft existing seasonal storage, 151 ac-ft required seasonal storage Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TOTAL Evapo- Seasonal transpir., Preclp., Variation In in Ratio n/a n/a 0.11 n/a n/a 0.16 n/a n/a 0.37 n/a n/a 0.82 n/a n/a 1.37 n/a n/a 1-83 n/a n/a 2.10 n/a n/a 1.76 n/a rVa 1-51 n/a n/a 1.09 n/a n/a 0.42 n/a n/a 0.46 n/a n/a 12.00 Project Other Total Demand, Demand, Demand, ac-tt e ac-ft ac-tt 49 0 49 73 0 73 168 0 168 370 0 . 370 615 0 615 824 0 824 945 0 945 791 0 791 678 0 . 678 490 . 0 490 188 0 188 209 0 209 5,400 0 5,400 RW Other Total Supply, Supply, Supply, ac-ft0 ac-tt' ac-tt 124 0 124 149 0 149 168 0 168 370 0 370 615 0 615 747 62 809 747 62 809 747 44 791 678 0 678 490 0 490 188 0 . 188 209 0 209 5,232 168 5,400 Reser. Reser. Unused Flow, Storage, RWSupp., ac-tt ' ac-tt * ac-tt 76 76 623 76 151 598 0 151 579 0 151 377 0 151 132 (15) 136 0 (136) (0) 0 •0 0 0 0 0 69 0 0 257 0 0 559 0 0 538 (0) 3,734 INPUT a) n/a « eflectiveAotal precipitation ratio (no units) b) n/a * irrigation efficiency (no units) c) 5,400 * annual project irrigation demand (ac-tt/yr) d) 8.00 B maximum recycled water supply available (mgd; e) 2.00 » maximum other water supply available (mgd; I) 8.00 * maximum reservoir inflow allowed (mgd) 8.00 = maximum reservoir outflow allowed (mgd) g) 151 « maximum reservoir working storage available (ac-ft) OUTPUT 1) 2.10 > peak month factor (no units) 2) n/a »irrigation application rate (tt/yr) 3) s.400 » annual total demand (ac-tt/yr] 4) 1.00 a total supply/demand ratio (no units; 5) .Jul * maximum irrigation demand month 6) Jan = minimum irrigation demand month 7) 8.00 * maximum RW supply used (mgd) 8) 0.66 =t maximum other supply used (mgd) 9) 0.81 = maximum reservoir inltow used (mgd) 10) 1.46 « maximum reservoir outflow used (mgd) 11) 151 » maximum reservoir working storage used (ac-ft) Monthly Supply / Demand $ mi 0 1 i fc • nri ri I'i I; - *t < - !. • *{ DDonand • Suoolv i £ I iX ! t \ Jan Ftb M»r Apr May Jun Jul Aug S«p Oct Month -B Nov Dec Monthly Reservoir / Unused RW Supply Jin Feb Mac Apr M«y Jun Jul Aug S«p Od Nw D«c F:\Proj«CISVPow«ll.207\C»ftst«d Ph U.001NReurvoif\fl«vMoSDS -5/31 WO Analysis of Monthly Supply/Demand/Storage Requirements PROJECT: CMWD Recycled Water System Expansion SCENARIO 3A: With Full Seasonal Storage SUPPLY: RW-8.74 rngd; Other=0 mgd OEMANO: Ultimate 9 9,BOO ac-tVyr ^ rORAGE: 0 ac-ft existing seasonal storage, 2,983 ac-tt required seasonal storage Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TOTAL Evapo- Seasonal transplr., Precip., Variation In In Ratio n/a n/a 0.11 n/a n/a 0.16 n/a n/a 0.37 n/a n/a 0.82 n/a n/a 1.37 n/a n/a 1.83 n/a n/a 2.10 n/a n/a 1.76 n/a n/a 1.51 n/a n/a 1.09 n/a n/a 0.42 n/a n/a 0.46 n/a n/a 12.00 Project Other Total Demand, Demand, Demand, •c-n c ac-tt ac-tt 88 0 88 '133 0 133 304 0 304 672 0 672 1,116 0 1,116 1,496 0 1.496 1,716 0 1,716 1.436 0 1,436 1,230 0 1,230 889 0 889 341 0 341 379 0 379 9,800 0 9,800 RW Other Total Supply, Supply, Supply, ac-tt • ac-tt' ac-ft 817 0 817 817 0 817 817 0 817 817 0 817 817 0 817 817 0 817 817 0 817 817 0 . 617 817 0 817 817 0 817 817 0 817 817 0 817 9.800 0 9,800 Reser. Reser. Unused Flow, Storage, RWSupp., ac-tt ' ac-tt • ic-tt 729 1,642 1,051 684 2,326 1,051 512 2,838 1.051 145 2.983 1,051 (299) 2,683 1.051 (679) 2,004 1.051 (899) 1,105 1,051 (619) 486 1,051 (414) 73 1,051 (73) 0 1,051 476 476 1,051 438 914 1,051 0 12,613 a) rV« « effectiveAotal predpiUlion raUo (no units) b) nfe • irrigation efficiency (no units) c) 9,800 « annual project irrigation demand (ac-Wyr) d) 20.00 * maximum recycled water supply available (mgd; e) 0.00 = maximum other water supply available (mgd; . f) 12.00 .maximum reservoir inflow allowed (mod) 12.00 » maximum reservoir outflow allowed (mgd) g) 3,000 = maximum reservoir working storage available (ac-tt) OUTPUT 1) 2.10 E peak month factor (no units) 2) n/a «irrigation application rate (K/yr) 3) 9,800 « annual total demand (ac-lt/yr) 4) 1.00 «total supply/demand ratio (no units; 5) Jul » maximum Irrigation demand month 6) Jan m minimum irrigation demand month 7) 8.74 •> maximum RW supply used (mgd) 8) 0.00 B maximum other supply used (mgd) 9) 7.80 « maximum reservoir inflow used (mgd) 10) 9.63 = maximum reservoir outflow used (mgd) 11) 2,983 » maximum reservoir working storage used (ac-tt) 2.000 1.800 1.600 1.400 1.200 . 1,000 800 600 400 200 0 Monthly Supply / Demand HJan Fib Mir Apr May Jun Jul Aug Sep Oa Nov Dec Month Monthly Reservoir / Unused RW Supply P..O. .JL.J 0.-JL..Q... Jan Feb Mar Apt May Jun Jul Aug Sep Od No* Dec F:\Projecis\Powet.807\Cartsbad Ph M.001\F»eservoir\RevMoSDS - 3A-Ultlmate 5/31/00 Analysis of Monthly Supply/Demand/Storage Requirements PROJECT: CMWD Recycled Water System Expansion SCENARIO 3B: With No Seasonal Storajje SUPPLY: RW=18.37mgd;Other=Omgd DEMAND: Ultimate © 9,800 ac-fl/yr ^ 'ORAGE: 0 ac-tt existing seasonal storage. 0 ac-tt required seasonal storage E Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TOTAL Evapo- Seasonal transpir., Preclp., Variation In in Ratio n/a n/a 0.1 1 n/a n/a 0.16 n/a n/a 0.37 n/a n/a 0.82 n/a n/a 1.37 n/a n/a 1.83 n/a n/a 2.10 n/a n/a 1 .76 n/a n/a 1.51 n/a n/a 1 .09 n/a n/a 0.42 n/a n/a 0.46 n/a n/a 12.00 Project Other Total Demand, Demand, Demand, ac-ftc ac-tt ac-tt 88 0 88 '133 0 133 304 0 304 672 0 672 1,116 0 1,116 1,496 0 1,496 1,716 0 1,716 1,436 0 1,436 1,230 0 1.230 889 0 889 341 0 341 379 0 379 9,800 0 9.800 . RW Other Total Supply, Supply, Supply, ac-ft" ac-tt* ac-tt . 88 0 88 133 0 133 304 0 304 672 0 672 1,116 0 1,116 1,496 0 1,496 1,716 0 1,716 1.436 0 1,436 1,230 0 1,230 889 0 889 341 0 341 379 0 379 9,800 .. 0 9,800 Reser. Reser. Unused Flow, Storage, RW Supp., ac-ft ' ac-ft * ac-tt 0 0 1,780 0 0 1,735 0 0 1,563 0 0 1.196 0 0 752 0 0 372 0 0 1S2 0 0 432 0 0 638 0 0 979 0 0 1.527 0 0 1,489 0 12,613 INPUT a) n/a = effectiveAotal precipitation ratio (no units) b) n/a «irrigation efficiency (no units) c) 9,800 m annual project imflaBon demand (ac-tt/yr) d) 20.00 * maximum recycled water supply available (mgd'. e) 0.00 = maximum other water supply available (mgd: I) 0.00 = maximum reservoir inflow, allowed (mod) 0.00 « maximum reservoir outflow allowed {mgd) g) OB maximum reservoir working storage available (ac-li) OUTPUT 1) 2.10 » peak month factor (no units) 2) n/a - irrigation application rate (n/yr) 3) 9.800 * annual total demand (ac-ttfyr) 4) 1.00 « total supply/demand ratio (no units', 5) Jul x maximum Irrigation demand month 6) Jan » minimum Irrigation demand month 7) 18.37 » maximum RW supply used (mgd) 8) 0.00 = maximum other supply used (mgd) 9) 0.00 » maximum reservoir inflow used (mgd) 10) 0.00 * maximum reservoir outflow used (mgd) 11) 0 * maximum reservoir working storage used (ac-tt) Monthly Supply / Demand § 800 • 200 0 fiTnT i rra. rm PI III Jan Fab Mar Ts_ 1 I * i i -v ! — • Su , 1 """i 1 ppiy ' F; • [1 J • 1 i|- Apr May Jun Jul Aug Sap Ocl Month |^ Nov Dae Monthly Reservoir / Unused RW Supply 2.000 Jan Fib Mai Apr May Jun Jut Aug Sap Oa Nov Dae F:\PrqecmPowell 207\C»r1sb«d Ph II 001\Ras«tvoii\RevMoSDS • 3B-Ullim»i«»31/00 Analysis of Monthly Supply/Demand/Storage Requirements PROJECT: CMWD Recycled Water System Expansion SCENARIO 3C: With Mahr Reservoir Seasonal Storage SUPPLY: RW*16,76 mgd; Other=0 mgd DEMAND: Ultimate 9 9,800 ac-fl/yr rORAGE: 0 ac-ft existing seasonal storage, 151 ac-ft required seasonal storage Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TOTAL Evapo- Seasonal transplr., Precip., Variation In In Ratio iVa n/a 0.11 n/a n/a 0.16 n/a n/a 0.37 n/a n/a 0.82 n/a n/a 1.37 n/a n/a 1.83 n/a n/a 2.10 n/a n/a 1.76 n/a n/a 1.51 n/a n/a 1.09 n/a n/a 0.42 n/a n/a 0.46 n/a n/a 12.00 Project Other Total Demand, Demand, Demand, ac-ft c ac-ft ac-ft 88 0 88 133 0 133 304 0 304 672 0 672 1,116 0 1,116 1,496 0 1,496 1,716 0 1,716 1,436 0 1,436 1,230 0 1,230 889 0 889 341 0 341 379 0 379 9,800 0 9,800 RW Other Total Supply, Supply, Supply, ac-ft ' ac-ft ' ac-ft 164 0 164 208 0 208 304 0 304 672 0 , 672 1,116 0 1,118 1,496 0 1,496 1,565 0 1,565 1,436 0 1,436 1,230 0 ' 1.230 889 0 889 341 0 341 379 0 379 9,800 0 9,800 Baser. Reser. Unused Flow, Storage, RWSupp., ac-ft' ac-ft" lc-ft 76 76 1,704 76 151 1,859 0 151 1,563 0 151 1,196 0 151 752 0 151 372 (151) 0 303 0 0 432 0 0 638 0 0 -979 0 0 1,527 0 0 1,489 0 12,613 INPUT a) n/a - ellectiye/iotal precipitation ratio (no units) b) n/a = irrigation efficiency (no units) c) 9,800 « annual project irrigation demand (ac-tt/yr] d) 20.00 = maximum recycled water supply available (mgd; e) 0.00 - maximum other water supply available (mod1, f) 3.00 = maximum reservoir inflow allowed (mgd) 3.00 * maximum reservoir outflow allowed (mgd) g) 151 i maximum reservoir working storage available (ac-tt) OUTPUT 1) 2.10 = peak month factor (no units) 2) n/a = irrigation application rale (ttVO 3) 9,800 - annual total demand (ac-fl/yr) 4) 1.00 • total supply/demand ratio (no units; 5) Jul B maximum Irrigation demand month 6) Jan « minimum irrigation demand month 7) 16.76 •> maximum RW supply used (mgd) 6) 0.00 • maximum other supply used (mgd) 9) 0.81 * maximum reservoir Inflow used (mgd) 10) . 1.61 » maximum reservoir outflow used (mgd) 11) 151 » maximum reservoir working storage used (ac-ft) Monthly Supply / Demand Jan Feb Mar Apr May Jun Jul Aug S«p del No» D<c Monthly Reservoir / Unused RW Supply i.eoo Jan Feb Mar Apr May Jun Jul Aug Sip Oct Nov CXc F:\Projec1s\Pow4ll.207\Cartsbacl Pn II.001 \HcurvoiAKcvMoSOS - 3C-Ulima»S/31/00 Appendix C EMERGENCY STORAGE MODEL RUNS CGvL ENGINEERS IN ASSOCIATION WITH JOHN POWELL & ASSOCIATES C-l Analysis of Monthly Supply/Demand/Storage Requirements PROJECT: CMWD Recycled Water System Expansion SCENARIO 2D: With Mahr Reservoir Seasonal and Emergency Storage SUPPLY: RW=8.00 mgd with toss of 149 ac-ft in February; Other=0.66 mgd OEMAND: Current 9 5,400 ac-ft/yr k fORAGE: 0 ac-ft existing seasonal storage, 151 ac-ft required seasonal storage •"i- Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TOTAL Evapo- Seasonal transpir., Preclp., Variation in in Ratio n/a n/a 0.11 n/a n/a 0.16 n/a n/a 0.37 n/a n/a 0.82 n/a n/a 1.37 n/a n/a 1.83 n/a n/a 2.10 n/a n/a 1.76 n/a n/a 1.51 n/a n/a 1.09 n/a n/a 0.42 n/a n/a 0.46 n/a n/a 12.00 Project Other Total Demand, Demand, Demand, ac-tt c ac-ft ac-ft 49 0 49 73 0 73 168 0 168 370 0 370 615 0 615 824 0 824 945 0 945 791 0 791 678 0 678 490 0 490 188 0 188 209 0 209 5,400 0 5,400 RW Other Total Supply, Supply, Supply, ac-tt • ac-tt • ac-tt 124 0 124 000 317 0 317 370 0 370 615 0 615 747 62 809 747 62 809 747 44 791 678 0 678 490 0 490 188 0 188 209 0 209 5,232 168 5,400 Reser. Reser. Unused Flow, Storage, RWSupp., Bc-ft1 ac-ft' ac-tt 76 76 623 (73) 2 747 149 151 430 0 151 377 0 151 132 (15) 136 0 (136) (0) 0 0 (0) 0 0 (0) 69 0 0 257 0 0 559 0 0 538 0 3,733 JNPUT a) n/a « effedive/lotal precipitation ratio (no units) b) n/a « irrigation efficiency (no units) c) 5.400 « annual project irrigation demand (ac-tt/yr) d) 8.00 •= maximum recycled water supply available (mod; e) 2.00 • maximum other water supply available (mgd; () 8.00 = maximum reservoir inflow allowed (mgd) 8.00 =» maximum reservoir outflow allowed (mgd) gj 151 = maximum reservoir working storage available (ac-tt) OUTPUT 1) 2.10 speak month factor (no units) 2) n/a m irrigation application rale (It/yr) 3) 5,400 = annual total demand (ac-tt/yr) 4) 1.00 • total supply/demand ratio (no units; 5) Jul » maximum Irrigation demand month 6) Jan » minimum Irrigation demand month 7) 8.00 = maximum RW supply used (mgd) 8) 0.66 m maximum other supply used (mgd) 9) 1.60 = maximum reservoir inflow used (mgd) 10) 1.46 » maximum reservoir outflow used (mgd) 11) 151 = maximum reservoir working storage used (ac-fl) Monthly Supply / Demand £ 600 1 «,§ 400 • > 300 200 100 0 r •*i E I • Fl JH.H ,11, P|_i t !• 't i; r|~;. nr F F1 I1 i f 1 ' '.- ' ! p ! r~ ' JT .; •• - ' i JOamandj • Supply 1 ~ Y -I 1 Jan Fab Mar Apr May Jun Jul Aug Sap Oct NOT Dae Month Monthly Reservoir / Unused RW Supply Jan fa> Mar Apr May Jun Jul Aug Sap Oa Nov Dae F:\P(Oi«cls\PO"ell.207VCert»Md Ri H.001\Re»«ivoit\R«yMoSDS -SI3MW) Analysis of Monthly Supply/Demand/Storage Requirements PROJECT: CMWO Recycled Water System Expansion SCENARIO 20: With Mahr Reservoir Seasonal and Emergency Storage SUPPLY: RW=8.00 mgd with loss of 151 ac-R in March; Other=0.66 mgd DEMAND: Current Q 5,400 ac-ft/yr 'ORAGE: 0 ac-ft existing seasonal storage, 151 ac-tt required seasonal storage Month Jan Feb Mar Apr May Jun Jut Aug Sep Oct Nov Dec TOTAL Evapo- Seasonal transpir., Precip., Variation In In Ratio n/a n/a 0.11 n/a n/a 0.16 n/a n/a 0.37 n/a n/a O.B2 n/a n/a 1.37 n/a n/a 1.83 n/a n/a 2.10 n/a n/a 1.76 n/a n/a 1.51 n/a n/a 1.09 n/a n/a 0.42 n/a n/a 0.46 n/a n/a 12.00 Project Other Total Demand, Demand, Demand, ac-ft c ac-ft ac-tt 49 0 49 '73 0 73 168 0 168 370 0 370 615 0 615 624 0 624 945 0 945 791 0 791 678 0 678 490 0 490 188 0 188 209 0 209 5,400 0 5,400 RW Other Total Supply, Supply, Supply, ac-tt ° ac-tt* ac-tt 124 0 124 149 0 149 17 • 0 17 521 0 . 521 615 0 615 747 62 809 747 62 809 747 44 791 678 0 678 490 0 490 188 0 188 209 0 209 5,232 168 5,400 Reaer. Recer. Unused Row, Storage, RWSupp., ac-n1 ac-tt* ac-tt 76 76 623 76 151 598 (151) 0 730 151 151 226 0 151 132 (15) 136 0 (136) (0) 0 0 (0) 0 0 (0) 69 0 0 , 257 0 0 559 0 0 538 (0) 3.734 INPUT a) n/a » eflecliveAotal precipitation ratio (no units) b) n/a - irrigation efficiency (no units) c) 5,400 = annual project irrigation demand (ac-tt/yr) d) 8.00 « maximum recycled water supply available (mgd; e) 2.00 « maximum other water supply available (mgd; I) B.OO » maximum reservoir inflow allowed (mgd) 8.00 • maximum reservoir outflow allowed (mgd) g) 151 = maximum reservoir working storage available (ac-lt) OUTPUT 1) 2.10 « peak month factor (ho units) 2) n/a • irrigation application rate (tt/yr) 3) 5,400 • annual total demand (ac-ft/yr) 4) 1.00 * total supply/demand ratio (no units; 5) Jul « maximum Irrigation demand month 6) Jan » minimum irrigation demand month 7) B.OO - maximum RW supply used (mgd) 8) 0.66 • maximum other supply used (mgd) 9) 1.61 ' maximum reservoir "mllow used <mgd) 10) 1.61 * maximum reservoir outflow used (mgd) 11) 151 > maximum reservoir working storage used (ac-tt)' Monthly Supply / Demand BOO .| 'uu i 600 • 1 400 • > ™* 300 • ZOO 100 0 1 1" j n _i n Fl.tfML,' $ „ ;: :•• ^ i ; j I - • f(, \° ': * J L" Ocmind Supply | i 1 — i J i "1 1 1 Jan Fib Mar Apr May Jun Jul Aug Sep Oct Nov DM Month Monthly Reservoir / Unused RW Supply 800 J>n Feb Mar Apt May jun Jul Aug Sw Oa No» D»c F:VProj«a\Pw«« Z07\Cirlsb»d Ptl U.001\B«Mtvoir«»vMoSDS • 2D-M«rEmetQ &31IOO I Analysis of Monthly Supply/Demand/Storage Requirements PROJECT: CMWD Recycled Water System Expansion SCENARIO 2D: With Mahr Reservoir Seasonal and Emergency Storage SUPPLY: RW=8.00 mgd with loss of 131 ac-tt in April; Other=0.66 mgd DEMAND: Current Q 5,400 ac-ft/yr . fORAGE: 0 ac-tt existing seasonal storage, 151 ac-ft required seasonal storage Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec TOTAL Evapo- Seasonal transpir., Preclp., Variation In In Ratio n/a n/a 0.11 n/a n/a 0.16 n/a n/a 0.37 n/a n/a 0.82 n/a n/a 1.37 n/a n/a 1.83 n/a n/a 2.10 n/a n/a 1.76 n/a n/a 1.51 n/a n/a 1.09 n/a n/a 0.42 n/a n/a 0.46 n/a n/a 12.00 Project Other Total Demand, Demand, Demand, BC-ft c 8C-tt ac-tt 49 0 49 '73 0 73 168 0 168 370 0 370 615 0 615 824 0 824 945 0 945 791 0 791 678 0 . 678 490 0 490 188 0 188 209 0 209 5.400 0 5,400 RW Other Total Supply,. Supply, Supply, BC-ft ° ac-tt" ac-tt 124 0 124 149 0 149 168 0 168 239 0 239 747 0 747 747 62 809 747 62 809 747 44 791 678 0 678 490 0 490 188 0 188 209 0 209 5,232 168 5,400 Reser. Reser. Unused Row, Storage, RWSupp., ac-tt' ac-tt9 »c-tt 76 76 623 76 151 598 0 151 579 (131) 20 508 132 151 0 (15) 136 0 (136) (0) 0 0 (0) 0 0 (0) 69 0 0 2S7 0 0 559 0 0 538 0 3,733 INPUT a) n/a = ettertive/lotal precipitation ratio (no units) b) n/a «irrigation efficiency (no units) . c) 5,400 « annual project irrigation demand (ae-H/yr) d) 8.00 = maximum recycled water supply available (mgd*. e) 2.00 > maximum other water supply available (mgd; I) 8.00 « maximum reservoir inflow allowed (mgd) 6.00 - maximum reservoir outflow allowed (mgd) g) 151 e maximum reservoir working storage available (ac-tt) OUTPUT 1) 2.10 = peak month factor (no units) 2) n/a - irrigation application rate (ft/yr) 3) 5,400 * annual total demand (ac-H/yr) 4) 1.00 * total supply/demand ratio (no units) 5) Jul = maximum irrigation demand month 6) Jan » minimum irrigation demand month 7) • 8.00 » maximum RW supply used (mgd) 8) 0.66 - maximum other supply used (mgd) 9) 1.41 s maximum reservoir inflow used (mod) 10) 1.46 > maximum reservoir outflow used (mgd) 11) 151 - maximum reservoir working storage used (ac-tt) Monthly Supply / Demand U ? 300 100 0 • [_ \ « • nrJrBll - i - D Demand) | • Supply 1 • '. c -H j»n Fib Mar Apr May Jun Jul Aug Sep Oct Han OK Month Monthly Reservoir / Unused RW Supply >n Feb Mar Apr May Jun Jul Aug Sop Oel Nov 0« F:\Projtca\Pmnll.207\ClrtitacI Ph H.001\8«ervoir\RevMoSOS • 20-AprErrwrg S/31/OO EXHIBIT C Method of Calculating Recycled Water Rate Pre-Exr*?nj!Jfm Annual Cost (11 FY 2002/03 . . Allocated to MRF Tertiary Facilities Budget Percent . Amount MRF Plant Costs Labor Materials Power Other operating costs Lift Station No. 1 Mahr Reservoir Capital Recovery Overhead -Wastewater Department Overhead - District Wide Total Annual Costs to Recover Quarterly Payments Total Quarterly Payment due to VALLECITOS Post-Exppnsion Annual Cost (I) $ 210,000 > 25.0% $ 740,000 9.6% 225,000 . 25.0% 43,000 50.0% 60,000 100.0% 17,000 100.0% $ 445,000 9.0% 3,658,000 1.9% + s_ _. . . , Anticipated Allocated to MRFOriginal or Post.Expansion Facnities 52,500 71,040 56,250 21,500 60,000 17,000 110,926 40,050 69,502 498.138 4 J24 535 Tertiary Actual Costs Annual Costs Percent Amount MRF Plant Costs (2) Labor Materials Power Other operating costs Lift Station No. 1 Mahr 'Reservoir Overhead - Wastewater Department Overhead - District Wide Capital Recovery (3) Existing filtration plant Existing disinfection facility Existing effluent pumping station Existing microscreen Existing Mahr Reservoir (4) Expansion design costs Expansion of filtration plant Expansion of disinfection facility Total Annual Costs to Recover Number of months per year Total Monthly Payment due to VALLECITOS $ 329,000 25.0% $ 237,000 9.6% 539,000 25.0% 90,000 50.0% 126,000 100.0% 15,000 100.0% 500,851 9.0% 4,117,111 1.9% $ 613,821 53,516 100.0% 158,041 13,779 100.0% 155,602 13,566 100.0% 219,841 19,167 100.0% 125,000 6,975 100.0% 204,923 17,866 100.0% 977,000 85,179 100.0% 336,000 29,294 100.0% • •»• s_ 82,250 22,752 134,750 45,000 126,000 15,000 45,077 78,225 53,516 13,779 13,566 19,167 10,898 17,866 85,179 29,294 792.319 12 66.027 >tes: Annual costs shall be set each year based on budgeted amounts and retrospectively adjusted to audited amounts after year-end as described in Section 13 of the agreement. MRF Plant Costs - Operating costs for labor, materials, power, "other operating costs", Lift Station No. 1, Mahr Reservoir and overhead will be reviewed at year-end and adjusted to reflect actual costs. For Capital Recovery the costs will be specifically identified as to primary, secondary, and tertiary treatment, (i.e., 0% will be allocated to MRF Tertiary for costs specifically identified to primary and secondary treatment while 100% of tertiary treatment costs will be allocated to MRF Tertiary. "Other operating costs" include miscellaneous items such as telemetry, telephone lines, minor repairs, etc. Vallecitos' actual costs, of expansion design; filtration plant and disinfection facilities shall be used, when calculating capital recovery. Vallecitos' cost of subsequent replacement of MRF tertiary facilities will replace original costs used for calculating capital recovery. Existing facilities no longer needed for tertiary processes will be eliminated from the capital recovery calculation. Capital recovery shall be calculated based on an engineering economic formula using a uniform series capital recovery factor with a compound interest of six (6) percent, and a twenty-year life. Mahr Reservoir value is based upon the existing inlet/outlet piping through the reservoir, leakage recovery piping, and fencing, access road and overflow facilities only. The existing dam drainage pump back system and inlet/outlet facilities will be replaced with new facilities identified in Exhibit "B". EXHIBIT "A" MAP OF CARLSBAD MUNICIPAL WATER DISTRICT'S RECYCLED WATER SERVICE AREA WITHIN VALLECITOS WATER DISTRICT Recycled Water Meter Recycled Service Line Meter NC VALVE Pump Station Reservoir Recycled water main by Agency ™«" CMWD PIPE VWDPIPE OMWD PIPE City Boundary VALLECITOS AREA SERVED BY CMWD VWD/CMWD METER SAN ELIJO RD MEADOWLARK WATER RECLAMATION FACILITY (VALLECITOS WATER DISTRICT) MAHR RESERVOIR VALLECITOS WATER DISTRICT VWD/OMWD METER EXHIBIT A - EXTENT OF CMWD'S RECYCLED WATER SYSTEM WITHIN VALLECITOS WATER DISTRICT DATE: 08/12/2008 NAME LRosu/Arome FILE: J:\GIS\Engineering\GIS_Projects\ArcviewProjects-LR\Plummer