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HomeMy WebLinkAbout1977-11-01; City Council; 3069-6; Wastewater reclamation feasibility study• , | /««». • --1 "W" • --*CITY OF CARLSBAD AGENDA BILL NO. 3069 - Supplement #6 • Initial: Dept.Hd. DATE- November 1, 1977 C. Atty. DEPARTMENT: Public Works C. Mgr. R Subject: CARLSBAD WASTEWATER RECLAMATION FEASIBILITY STUDY Statement of the Matter On September 13, 1977 City Council authorized the Public Works Administrator to negotiate an agreement with Mr. Roy Ward of Lake Calavera Hills Associates for a wastewater reclamation feasibility study to be done by Lowry and Associates, On September 21, 1977 the Public Works Administrator met with Mr. Roy Ward and Mr. Dennis 0' Leary of Lowry and Associates. At that meeting, it was discussed and understood that the study will contain two parts: the first part will be the general study of suitability and location of proposed reclamation sites within the City of Carlsbad and the second part will address specific applica- tions of the findings of the first portion of the study to the Lake Calavera Hills project. The first portion of the study will be conducted under the di- rection of the Public Works Administrator and will be subject to his approval. The study will be financed in its entirety by Lake Calavera Hills Associates. Lowry and Associates prepared and submitted an outline for Report on Reclamation Program (Exhibit 2). 'With slight modification to Section VIII, the outline was approved by the Public Works Administrator and is being submitted for Council's approval. Exhibits 1. Staff report dated October 24, 1977 (with summary of September 21, 1977 meeting with Roy Ward and Dennis O'Lear.y attached) 2. Outline of Report on Reclamation Program Recommendation If City Council concurs, they should, by minute motion, approve the Report on Reclamation Program as submitted and authorize Lowry and Associates to proceed with the study. Council action Tl_-|_77 The Council approved the Report on Reclamation Program as submitted, and authorized Lowry and Associates to proceed with the study. MEMORANDUM TO: City Manager FROM: Public Works Administrator DATE: October 24, 1977 SUBJECT: Carlsbad Wastewater Reclamation Feasibility Study The City Council, by unanimously accepting staff's recommendation on Agenda Bill 3069, Supplement #5, authorized the Public Works Administrator to meet and negotiate with Mr. Roy Ward and Lowry and Associates for pur- poses of conducting the referenced study. The study would be financed in its entirety by Mr. Ward and would contain two parts: the first part would be the general study of suitability and location of proposed reclamation sites within the City of Carlsbad and the second part would address specific applications of the findings of the first portion of the study to the Lake Calavera Hills project. On September 21, 1977, at 3:00 p.m., a meeting was held in the Public Works Administrator's office. In attendance were Mr. Roy Ward of Lake Cala- vera Hills Associates, Messrs. O'Leary and Fannon of Lowry and Associates, and Ron Beckman, City Public Works Administrator. At that meeting, it was dis- cussed and understood by all parties present that the report would have to be done in two separate and distinct sections, the first of which would deal with the general City-wide study. This would be conducted by Lowry and As- sociates under the direction of the Public Works Administrator and subject to his approval. Upon completion and acceptance of that portion, any subsequent work necessary for the purposes of the Lake Calavera Hills project would be pursued. Extensive discussion followed concerning the pertinent elements that should be analyzed as part of this report. A summary of the discussion is attached for your reference. Lowry and Associates was instructed to prepare an outline of part one of the study for submission and approval by the Public Works Administrator and for forwarding to City Council for their approval and authorization to commence work. This outline was prepared and submitted to the Administrator for his approval. With slight modification to Section VIII, the outline was approved and is being forwarded for approval by Council. Once Council's approval for the report is obtained, Lowry and Associates will prepare a time schedule and a bench mark meeting schedule for submission and approval by the Public Works Administrator. RECOMMENDATION It is recommended that the City Council approve, in concept, the outline for the Report on Reclamation Program as attached and authorize Lowry and Associates to proceed with the report, the cost of which will be borne by Lake Calavera Hills Associates. Ronald A. Beckman, P.'E. Public Works Administrator RAB:veb Attachment Exhibit 1 1/5 T •LL jfli owry /)/?/) \^on6ulting. C/t//t I V lent o ra n du m File Bill Fannon 2W* 9/26/77 CITY OF CARLSBAD RECLAMATION PROGRAM P*9*— \ ITEMS FOR REPORT The following items should be included in the Carlsbad Reclamation Report. Final outline and format will be developed later. 1. Reclamation Philosophy In keeping with the remarks made by Ron Beckman it would be well to have a rather long discussion of reclamation philos- ophy. This will point out that we are shifting from a concept of regional collection sewers connected to a single point of treatment on the ocean to a series of satellite plants. The effects of this philosophical shift on land use and other items should be discussed. 2. Reclamation Practices A general discussion of reclamation practices should be pre- sented. This would include both agricultural and open space irrigation, industrial use, impoundments, and live stream demonstrations. (Must be careful to talk about reuse not disposal which is the theme of most of our other reports.) We might also consider a more detailed presentation of cli- matological data and other information in an appendix if this seems appropriate. Such work would be based on similar studies for other jobs, including the 208 Study. 3. Encina Outfall Capacity Use of the Encina outfall as a fail-safe point of discharge should be discussed. This would involve the construction of effluent outfall pipelines to Encina. It is not beyond the realm of possibility that we could propose to discharge to the ocean an off-peak mixture of treated secondary efflu- ent and raw sewage. This concept would have to be investi- gated carefully. 4. Encina Treatment Capacity Some thoughts should be given to incorporation of the Encina Treatment Plant into the Reclamation Program. It might be possible to consider discharging all sludge from the satel- lite plants to Encina for treatment. This would drastically change the treatment system at Encina; perhaps necessitating Exhibit 1 2/5 Memo To File 9/26/77 Page 2 chemical addition to the primary plant or even a secondary plant regardless of the final requirements of EPA. The point is that it is not necessary to think of the Encina treatment facilities as providing full service for certain areas and zero service for areas where reclamation is practiced. 5. Geographic Distributioji The idea of drawing a dividing line along a certain contour level as suggested by Ron Beckman is excellent. It should be presented as a basis fortthe Reclamation Program. The location of the line can be'such that all downstream popula- tion is served at Encina. The size of this downstream popu- lation will determine the ultimate treatment capacity required at Encina. Conversely the location of the dividing line could be shifted to equal the available capacity. 6. Population Projections The type of document proposed should go heavy on formal population projections. These can be developed from CPO data and procedures. If standardized procedures are avail- able they can be utilized to show the effects of several different overall population approaches. We are not limited to E-0 or D-100 type projections nor should we be constrained by existing CPO data. We should be guided more by the data developed by the City and recently presented to CPO. 7. Population Distribution The different philosophy of providing sewerage service may result in some changes in location of interceptor sewers which, in turn, might have an effect on the population distribution previously developed by CPO for regional sewerage facilities. If this can be determined from CPO procedures without going into a detailed research project, the effect should be incor- porated in the Report. 8. Treatment Methods There should be a discussion of methods to be employed to pro- vide secondary treatment at the satellite plants. It is probable that conventional activated sludge will be preferred in the long run, but an analysis of trickling filters, oxida- tion ponds, oxidation ditches, and other methods should be presented. At this point the possibility of discharging sludge downstream to Encina would also be evaluated. Energy considerations should be presented as part of these analyses. Exhibit 1 3/5 Memo To File 9/26/77 Page 3 9. Agricultural Practices Some generalized information, applicable to the entire study area, should be presented on agricultural practices. This would include types of crops, irrigation, etc. The thought is to present general information which can be utilized by re- ference when specific sites are considered. This might well be tied in with some of our work on the 208 Study. 10. Open Space Irrigation Similar presentations should be made for general information on irrigation of open space and landscaping. Again this will serve as a reference for specific sites discussed subsequently. Some thoughts can be given here to maximizing the irrigation uses in order to justify larger reclamation plants. Once the above listed background information has been established we can pro- ceed with a step by step development of a proposed reclamation program for the City and surrounding areas. Some of the items which would be included in this section are as follows: 11. Delineation of Basins Utilizing population data and topographic maps, the locations of reclamation treatment plans can be determined and the result- ing drainage basins established. The intent here is to provide plants of reasonable size, 0.5 MGD to 1.5 MGD, at locations suitable to existing and proposed interceptor and outfall sewer lines. This approach may lead to the decision to install two rows of satellite plants. Although at this time it would appear that a single line of plants, perhaps six in number, would suffice. 12. Reclamation Sites After the plant site has been selected nearby areas where recla- mation can be practiced should be examined. Agricultural and open space uses will be the most important. Industrial uses will be limited to existing or proposed industrial zoned areas. There will be some give and take with plant size and location in order to develop the best balance of plant siting and reclamation use. 13. Industrial Reuse Industrial reuse should be included in the report even if it does not lend itself directly to the reclamation program which will be established primarily with irrigation in mind. Existing industrial zones should b e pinpointed and worked into the program as much as possible without sacrificing irrigation re- use opportunities. Exhibit 1 4/5 Memo To File 9/26/77 Page 4 . 14. Specific Plan If desired by the City, the procedure described above will lead to a definite specific plan for reclamation and re- use which will pinpoint treatment plant sites and areas to be irrigated. This should be checked out thoroughly with the City since they may not wish to limit themselves to sites selected at this time. Extreme care should be taken to coordinate selection with land use patterns, planning activities and other outside influences. 15. Environmental Effect Although we have been specifically told that this is not an EIR, we must devote some thought to environmental effects particularly with regard to growth inducement, which could be substantial. A relatively short section on this subject will have to be included in the Report. 16. Other Affects It will also be necessary to make some statements regarding other affects of the implementation of a reclamation pro- gram. These affects will be based on the recognition that we are abandoning the previous philosophy of centralized regional treatment plants. Affects will include land use, population location, population densities, and other similar i terns. 17. General Items Report should open with some general background information regarding water use practices, drought conditions, future cost of raw water, and other general items. The usual good word concerning reclamation and reuse should be included and hopefully improved upon. This information should be reviewed when the outline of the Report is being prepared so that the items discussed can be incorporated into the outline in their proper location. WWF:csh cc: D. O'Leary R. Beckman R. Ward Exhibit 1 5/5 /•*"»>• REPORT ON RECLAMATION PROGRAM (OUTLINE) Prepared for CITY OF CARLSBAD SAN DIEGO COUNTY November 1977 Prepared by LOWRY AND ASSOCIATES 3505 Caiuino de Rio, South San Deigo, CA. Exhibit 2 1/5 I. INTRODUCTION A. General Background B. Value of Reclamation C. Purpose of Report D. Authorization II. SCOPE OF STUDY A. Objectives B. Study Area C. Depth of Study III. TECHNICAL PARAMETERS A. Water Supply System B. Design Population C. Population Distribution D. Flow Available for Reclamation IV. REGULATORY CONSTRAINTS A. Discharge Requirements B. Title 22 C. Coastal Commission D. Local Requirements V. RECLAMATION PRACTICES A. Agricultural Irrigation B. Open Space & Landscape Irrigation Exhibit 2 2/5 V. RECLAMATION PRACTICES (Cont'd) C. Industrial Reuse D. Impoundments E. Supply vs. Demand VI. REGIONAL RECLAMATION PROGRAMS A. Centralized Treatment and Export B. "On Stream" Plants C. Satellite Plants D. Independent Facilities VII. SATELLITE PLANT CONCEPT A. General Theory B. Side Effects C. Application to Carlsbad D. Use of Encina for Sludge Handling VIII. TREATMENT PLANT SITE SELECTION A. Analysis of Drainage Basins B. Population and Flow C. Tentative Site Selections (2, D, Relation to Reclamation Site |3. E. Economics IX. FAIL-SAFE REQUIREMENTS A. Reason for Fail-Safe Facilities B. Alternatives C. Use of Encina Facilities Exhibit 2 3/5 X. RECLAMATION PROJECTS A. Analysis of Agricultural Parameters B. Location of Industrial Areas C. Other Reuse Potentials D. Relationship to Treatment Facilities E. Selection of Tentative Sites XI. PROGRAM DEVELOPMENT A. Satellite Plant Locations B. Proposed Reuse Sites C. Method of Operation D. Benefits Achieved E. Interaction with Other Agencies F. Methods of Implementation G. Time Schedules H. Institutional Arrangements XII. GENERALIZED UNIT COSTS A. Capital Costs B. O&M Costs C. Administrative Costs D. Estimated Income XIII. IMPLEMENTATION A. Inter Agency Action B. Financing C. Land Acquisition D. Legal Agreements & Contracts Exhibit 2 4/5 'W XIV. RECOMMENDATIONS A. Approve Report B. Adopt Program as City Policy C. Establish Methodology D. Specific Steps Exhibit 2 5/5