Loading...
HomeMy WebLinkAbout3338; Agua Hedionda & Calavera Creek Dredging; Agua Hedionda Creek Dredge Turbity Control Plan; 2006-03-01TURBIDITY CONTROL PLAN FOR THE AGUA HEDIONDA CREEK EMERGENCY DREDGING PROJECT CARLSBAD, CALIFORNIA Prepared for: California Regional Water Quality Control Board 9174 Sky Park Court, Suite 100 San Diego, California 92123 Attention: Christopher Means (858)637-5581 Prepared by: City of Carlsbad 1635 Faraday Avenue Carlsbad, California 92008 Attention: David Hauser March 2006 TABLE OF CONTENTS Section Page 1.0 INTRODUCTION AND PURPOSE 1 1.1 Dredging Description 2 1.2 Goals and Objectives 2 1.3 Contact Information 2 1.4 Scheduling 4 2.0 WATER QUALITY PROTECTION 5 2.1 Protection Features 5 3.0 DREDGE MONITORING 9 3.1 Turbidity Monitoring 9 3.1.1 Measurement Identification Codes 9 3.1.2 Measurements 9 3.1.3 Preconstruction Monitoring 10 3.1.4 Dredge Monitoring 10 3.1.5 Postconstruction Monitoring 10 3.2 Compliance Assessment 11 4.0 REPORTING REQUIREMENTS 13 4.1 Compliance Statements 13 5.0 REFERENCES 15 APPENDICES A Clean Water Act Section 401 Water Quality Certification 06C-007 B Figures C Horiba U-10 Water Quality Multimeter Specifications D Field Data Collection Log Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging Page i 05080103 Agua Hedionda TCP 3/6/06 LIST OF TABLES Table Page 1 Project Contacts, Agua Hedionda Creek Emergency Dredging Project 3 2 Project Description by Channel, Agua Hedionda Creek Channel Emergency Dredging Activity 11 Page ii Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging 05080103 Agua Hedionda TCP 3/6/2006 1.0 INTRODUCTION AND PURPOSE The City of Carlsbad (City) has recently been issued a Clean Water Act (CWA) Section 401 Water Quality Certification (401 Certification; 06C-007, see Appendix A) by the San Diego Regional Water Quality Control Board (RWQCB) for conducting emergency flood-control dredging in Agua Hedionda Creek in Carlsbad, California. Other environmental authorizations issued by the U.S. Army Corps of Engineers and the California Department of Fish and Game for this emergency maintenance work include: • California Department of Fish and Game (CDFG) California Fish and Game Code Section 1602 Streambed Alteration Agreement Notification No. 1600-2006-0060-R5 (1602) • U.S. Army Corps of Engineers (ACOE) 404 Individual Permit (200600151 -KJC) As required by the 404 Permit and CDFG agreement, the emergency dredging activity must be completed before March 15, 2006. The channel dredging is being conducted under emergency circumstances to maintain adequate flood protection for the residential community of Rancho Carlsbad, an existing residential mobile home community located east of El Camino Real and south of Cannon Road, in the northeastern section of Carlsbad, California (Appendix B, Figure 1). Over 50 percent of the homes in Rancho Carlsbad reside within the existing limits of the 100-year floodplain and will be subjected to flood damage during a major storm event if the previous channel capacity is not regained. The limit of channel dredging is shown by the project boundary lines in Figure 1 (Appendix B). Agua Hedionda Creek is a earthen channel watercourse that flows northwesterly through the western portion of Rancho Carlsbad. The channel has historically been subject to significant sedimentation. Due to increased peak discharge from development within the watershed and the accumulation of up to 6 feet of sediment currently in the channel, the channel's storm water conveyance capacity has been greatly diminished, which places approximately 278 Rancho Carlsbad properties at risk. The purpose of this Turbidity Control Plan (TCP) has been prepared to describe how turbidity will be monitored during the emergency project in accordance with the 401 Certification. Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging Page 1 05080103 Agua Hedionda TCP 3/6/06 Various best management practices (BMPs) will be employed to control turbidity within the project limits. 1.1 DREDGING DESCRIPTION The total extent of the emergency dredging in Agua Hedionda Creek will span from the downstream edge of the Cannon Road bridge to approximately 3,100 feet upstream (Appendix B, Figure 1). As planned, dredging will be conducted in phases. The first phase will involve tree removal within the channel and dredging between the El Camino Real and Cannon Road bridges (bend area). The second phase will include Agua Hedionda Creek channel from the El Camino Real bridge, working westward (upstream) to the southern boundary of Rancho Carlsbad Drive (Appendix B, Figure 1); and dredging of Agua Hedionda Creek channel from El Camino Real Bridge, to its confluence with Calaveras Creek. Refer to dredging methodology information provided by the City for the RWQCB permit application packet, submitted on February 2, 2006. 1.2 GOALS AND OBJECTIVES The main goal of the emergency dredging is to maintain flood protection (for a 100-year return frequency storm) by removing accumulated sediment and improving the capacity to convey floodwaters safely. The goal of this TCP is to describe appropriate BMPs that will minimize potential turbidity impacts and establish a protocol for monitoring upstream and downstream turbidity levels during active dredging in Agua Hedionda Creek, which would then be used to: • Monitor BMP effectiveness and maximize water quality protection, • Document hourly upstream and downstream turbidity measurements, and • Determine compliance with 401 Certification requirements. 1.3 CONTACT INFORMATION To promote communication between all involved parties, Table 1 provides contact information relative to resource agencies, City employees, consultants, and contractors involved in implementing this emergency project. Page 2 Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging 05080103 Agua Hedionda TCP 3/6/2006 Table 1 Project Contacts, Agua Hedionda Creek Emergency Dredging Project RESOURCE AGENCIES U.S. Army Corps of Engineers, Los Angeles District Regulatory Branch - San Diego Field Office 16885 W. Bernardo Drive, Suite 300-A San Diego, California 92127 Regional Water Quality Control Board San Diego Region 9174 Sky Park Court, Suite 100 San Diego, California 92123 California Department of Fish and Game South Coast Region 4949 Viewridge Avenue San Diego, California 92123 Kari Coler, Project Biologist Tel: (858) 674-6783 Kari.j.coler@usace.army.mil Chris Means, Environmental Scientist Tel: (858) 637-5581 meanc@rb9.swrcb.ca.gov Tamara Spear, Project Biologist Tel: (858) 467-4223 tspear@dfg. ca. gov LOCAL LEAD AGENCY City of Carlsbad 1635 Faraday Avenue Carlsbad, California 92008 David Hauser, Deputy City Engineer Tel: (760) 602-2739 dhaus@ci.carlsbad.ca.us Glen Van Peski, Project Manager GVP Consultants 3764 Cavern Place Carlsbad, CA 92010-6585 Tel: (760) 720-0500 gvanp@ci.carlsbad.ca.us Glenn Pruim, City Engineer Tel: (760) 602-2707 gprui@ci.carlsbad.ca.us Marcela Escobar-Eck, Planning Director Tel: (760) 602-4604 mesco@ci.carlsbad.ca.us Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging 05080103 Agua Hedionda TCP 3/6/06 PageS CONSULTING TEAM ED AW, Inc. (Environmental) 1420 Kettner Boulevard, Suite 620 San Diego, California 92101 Konecny Biological Services (Light Footed Clapper Rail Surveys) 1501 East Grand Avenue, #2403 Escondido, California 92027 Marathon Construction (Dredging Contractor) 10108 Riverford Road Lakeside, California 92040 Jacqueline Dompe, Principal in Charge Tel: (619) 233-1454 ext. 323 dompej@edaw.com Teresa Wilkinson, Senior Project Manager Tel: (619) 233-1454 ext. 362 wilkinsont@edaw.com Mark Williams, Senior Environmental Scientist Tel: (619) 233-1454 ext. 367 williamsm@edaw.com Jeff Warner, Environmental Analyst Tel: (619) 233-1454 ext. 386 warnerj@edaw.com John Konecny, Biologist Tel: (760) 489-5276 jkonecny@nethere.com Joe Ellis Tel: (619) 276-4401 joe.ellis@marathonconstruction.biz 1.4 SCHEDULING To avoid disturbing nearby sensitive birds during the breeding season, emergency dredging in Agua Hedionda Creek will be completed by March 15, 2006 per the 404 permit Special Condition l.a. and l.b., as well as CDFG Agreement Condition No. 12. Dredging activities are anticipated to begin on March 6, following RWQCB approval of this TCP. Page 4 Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging 05080103 Agua Hedionda TCP 3/6/2006 2.0 WATER QUALITY PROTECTION Water quality in Agua Hedionda Creek, as well as the sensitive downstream Agua Hedionda Lagoon, will be protected to the maximum extent practicable through the implementation of a variety of BMPs. The lagoon is listed on the CWA Section 303(d) list of Impaired Water Bodies for sediment/siltation (and bacteria), and Agua Hedionda Creek is listed as impaired due to high total dissolved totals. Accordingly, the City will incorporate a number of water quality protection measures to minimize potential localized impacts and assist in protecting Agua Hedionda Creek and the downstream lagoon. As discussed below, various BMPs will be implemented to minimize impacts to water quality to the maximum extent practicable. Protecting water quality within Agua Hedionda Creek will involve a variety of BMPs, as described below. 2.1 PROTECTION FEATURES Prior to any dredging work in the creek, BMPs for limiting turbidity and sediment dispersion will be installed; the following steps are anticipated: 1. The upstream and downstream sections proposed for temporary check dam structures (see below) will be surveyed for sensitive biological resources before installation. The footprint alignment of the check dams will be modified as appropriate to avoid any sensitive resources discovered. All temporary check dams will be constructed sufficiently from bank to bank to avoid leakage or short-circuiting at the bank edges. This includes accommodating for storm water runoff during the course of work. 2. A temporary sandbag check dam will be installed at the upstream end of the project (east of Rancho Carlsbad Drive) to allow the construction of a diversion ditch and downstream sediment-catchment system as described below. The dam structure will approximate a wedge shape, with the vertical face upstream and the tapered, reinforced portion downstream. 3. A gravel-bag check dam will be installed at the downstream end of the project boundary (i.e., under the Cannon Road bridge). This check dam will be followed by two settling ponds (Appendix B, Figure 2): Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging Page 5 05080103 Agua Hedionda TCP 3/6/06 a. The secondary settling pond will be constructed of at least three rows of gravel bags around its perimeter. It will be keyed into the primary dam upstream to avoid short- circuiting. b. In the center of the top row, four or five of the gravel bags will be separated by 1 to 2 inches to provide a diffused release of detained water. c. The tertiary settling pond will be constructed of at least two rows of gravel bags around its perimeter. It will be keyed into the secondary dam upstream to avoid short-circuiting. d. The center two gravel bags on the top row of the tertiary settling pond will be separated by 1 inch on each end (i.e., three small discharge relief slots) to provide a diffused release to the creekbed below. 4. Create a diversion ditch along the bank of Agua Hedionda Creek to convey flow along the toe of the bank and toward the settling ponds at the downstream end. The contractor may choose which side to construct the diversion ditch relative to minimizing work interference. a. A small berm will be constructed on the edge of the diversion ditch (opposite the bank) to contain the flow over the anticipated range of water depths. b. The diversion will be lined with heavy plastic and anchor it to the bank securely and without tearing. c. The lining will be allowed to cover to berm on the opposite side and place gravel bags on and around the berm for anchoring. This diversion system will serve to keep water out of the active dredging area. 5. A sedimentation trench will be created at lower limit of the project, upstream of the check dam described in #3 above. An example plan view is provided in Figure 2 and a profile view is shown in Figure 3 (see Appendix B). 6. The diversion ditch will be connected with the sedimentation trench (see Appendix B, Figure 2). 7. The upstream check dam will be partially dismantled to allow water flow in the diversion ditch only. The upstream dam will be bolstered to maintain structural integrity and properly convey water into the diversion ditch only. Page 6 Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging 05080103 Agua Hedionda TCP 3/6/2006 a. Over the course of 1 to 2 hours, sandbags will be dismantled slowly to regulate a controlled flow to the diversion ditch. b. Any removed sandbags will be staged at one location on the adjacent bank for readiness. 8. Once the water has filled the downstream sedimentation trench and clear water begins to spill over the primary downstream check dam: a. Two to three gravel bags will be removed from the top row in the center of the dam, while standing on the downstream side of the dam. The bags will be stacked on the top row but out of the flow line. A level sheet flow will be created at the discharge point. b. The secondary and tertiary settling ponds will be allowed to fill, and the clarity of the spillover flow will be observed. c. If outflow is not running clear, rows of gravel bags will be added to increase detention volume and provide better dampening of the plunge pool. d. If outflow from the tertiary settling pond is creating sediment disturbance of the creekbed, gravel bags will be added directly underneath the outflow point(s) to dissipate energy. 9. The entire diversion and check dam system will be inspected for integrity before commencing dredging work. The area will be staked with yellow caution tape to avoid unintentional damage. 10. Dredging will commence once the diversion system is stabilized. 11. The diversion system will be inspected twice daily (morning and evening) and make necessary adjustments relative to any changes in water flow. 12. All check dam structures and materials used to control turbidity will be removed form the creekbed once dredging is complete. Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging Page 7 05080103 Agua Hedionda TCP 3/6/06 This page intentionally left blank. Page 8 Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging 05080103 Agua Hedionda TCP 3/6/2006 3.0 DREDGE MONITORING Monitoring of water quality in the vicinity of the Agua Hedionda Creek dredging project will involve turbidity field measurements at pre-determined locations upstream of any dredging activity and downstream of the project limits (Figure 1). 3.1 TURBIDITY MONITORING During active dredging, turbidity monitoring will be conducted in accordance with the 401 Certification, which is discussed further below. Field logs will be kept for each day of monitoring. These logs, along with the other compliance assessment materials (see Section 4.1), will be forwarded to the RWQCB within 30 days of completing the emergency dredging activity. 3.1.1 Measurement Identification Codes For each upstream and downstream turbidity measurement, unique measurement identifier codes will be provided on field logs that can be correlated to date, time, and location of the measurement. All turbidity measurements will be recorded in accordance with the following convention: UP-031006-1300 Where: UP = Upstream sampling location ("DN" shall designate downstream) 031006 = March 10, 2006 (mmddyy) 1300 = 1:00 p.m. (1100 = 11:00 a.m.) 3.1.2 Measurements Turbidity monitoring during the emergency dredging will involve: • Collecting water samples within the active flow for measuring turbidity onshore, • Measuring creek velocity at the point of measurement, and • Recording visual observations. Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging Page 9 05080103 Agua Hedionda TCP 3/6/06 For upstream and downstream monitoring locations (Figure 1), grab samples of creek water will be collected, transferred to a calibrated container cup, and measured for turbidity via electronic instrumentation (see Appendix C). Grab samples will be collected via a telescopic pole to avoid water disturbance from foot traffic. Collecting the grab sample will include: • Placing a sampling cup in the center of the discharge flow; • Collecting water just below the surface to avoid interference with underlying sediment; and • Allowing the cup to fill while facing into the current. To keep turbidity measurements consistent throughout each day, upstream recordings will be taken on the hour, while downstream recordings will be taken on the half hour. This will allow time to record observations, inspect BMPs, and travel to the next measurement location. 3.1.3 Preconstruction Monitoring Prior to any site work, ambient turbidity measurements will be collected at several locations along the Agua Hedionda Creek alignment to document preconstruction conditions (Figure 1). 3.1.4 Dredge Monitoring Turbidity measurements during active dredging will be taken at upstream and downstream project locations (Figure 1) hourly. Upstream measurements will be collected to the east of Rancho Carlsbad Drive, and downstream measurements taken at the outflow point of the tertiary settling pond. 3.1.5 Postconstruction Monitoring As with preconstruction ambient turbidity monitoring, turbidity measurements will be repeated at the same eight locations along the Agua Hedionda Creek channel to document postconstruction conditions (Figure 1). Measurements will be taken approximately 72 hours following demobilization. Page 10 Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging 05080103 Agua Hedionda TCP 3/6/2006 3.2 COMPLIANCE ASSESSMENT Turbidity measurements recorded throughout the course of the Agua Hedionda emergency dredging activity will be compared to the tolerance ranges specified in Condition B.I of the 401 Certification (Table 2). Table 2 Project Description by Channel, Agua Hedionda Creek Channel Emergency Dredging Activity Background Turbidity 0-50 NTU 50-100NTU Greater than 100 NTU Maximum Increase 20% over background turbidity level 10 NTU 10% over background turbidity level The data will be compiled, tabulated, and graphed for reporting with the compliance statement (see Section 4.1). During active dredging, should the downstream measurement exceed the maximum allowable increase in turbidity, the water quality monitor will assess BMPs conditions and make recommendations to the City and the contractor to immediately adjust, modify, or replace any BMP (or component thereof) to prevent further exceedances of turbidity levels. Any such remedial actions taken will be reported to the RWQCB within 2 working days. After approximately 1 week and pending compliance with the turbidity limitations stated in Table 2 above (and 401 Certification Condition B.I), the following schedule may be presented to .the RWQCB for considering a possible amendment to the 401 Certification: • Three times daily o Measurements 1 hour after start of construction o Midday measurements o Measurements 1 hour before stop of construction Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging Page 11 05080103 Agua Hedionda TCP 3/6/06 Should these measurements continue to demonstrate compliance with 401 Certification conditions, the monitoring schedule may be requested to: • Twice daily o Midday measurements o Measurements 1 hour before stop of construction Any such modifications to the 401 Certifications are contingent on RWQCB approval and the issuance of a 401 Certification Amendment. Page 12 Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging 05080103 AguaHedionda TCP 3/6/2006 4.0 REPORTING REQUIREMENTS Reporting of water quality parameters will be consistent with RWQCB requirements (i.e., 401 Certification Condition B.3). A post-dredging water quality monitoring summary will be prepared within 30 days of site demobilization. Daily monitoring log forms (Appendix D) will be attached to show each measurement and set of observations. At least one photograph will be taken each day at upstream and downstream locations to visually document water quality conditions and BMP integrity. These photographs will be included as attachment material to the final water quality monitoring report for the project. 4.1 COMPLIANCE STATEMENTS A statement of compliance with 401 Certification Condition B will be provided within the final report. Turbidity measurements will be plotted relative to limitations (401 Certification B.I) for compliance comparison. The statement will describe physical conditions, best management practices, dredging dates, and a summary tabulation of turbidity measurements. Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging Page 13 05080103 Agua Hedionda TCP 3/6/06 This page intentionally left blank. Page 14 Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging 05080103 Agua Hedionda TCP 3/6/2006 5.0 REFERENCES RWQCB (San Diego Regional Water Quality Control Board). 2006. Clean Water Act Section 401 Water Quality Certification and Waiver of Waste Discharge Requirements for Discharge of Dredged and/or Fill Materials. Issued for the Agua Hedionda Channel Dredging Project (File No. 06C-007). March 2. Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging Page 15 05080103 Agua Hedionda TCP 3/6/06 This page intentionally left blank. Page 16 Turbidity Control Plan, Agua Hedionda Creek Emergency Dredging 05080103 Agua Hedionda TCP 3/6/2006 APPENDIX A CLEAN WATER ACT SECTION 401 WATER QUALITY CERTIFICATION 06C-007 California Regional Water Quality Control Board San Diego Region "~^^~^^™^~~ Internet Address- httpK/7ww\rswrcb!ca!gov/nvqcb9/ Alan C. Lloyd Ph I) 9174 Sk Pafk c Suit£ ]00 San Di California 92123 AmnW ts^h^a^.™^™.^ 5,rrew^/0r Phone (858) 467-2952 - FAX (858) 571-6972 Arnold SchwarzeneggerEnvironmental uovernor Protection Action on Request for Clean Water Act Section 401 Water Quality Certification and Waiver of Waste Discharge Requirements for Discharge of Dredged and/or Fill Materials PROJECT: Agua Hedionda Channel Dredging Project (File No. 06C-007) APPLICANT: Mr. Glenn Pruim, Public Works Director City of Carlsbad 1635 Faraday Avenue Carlsbad, CA 92008 ACTION: a Order for Low Impact Certification a Order for Denial of Certification • Order for Technically-conditioned • Waiver of Waste Discharge Certification Requirements STANDARD CONDITIONS: The following three standard conditions apply to all certification actions, except as noted under Condition 3 for denials (Action 3). 1. This certification action is subject to modification or revocation upon administrative or judicial review, including review and amendment pursuant to section 13330 of the California Water Code and section 3867 of Title 23 of the California Code of Regulations (23 CCR). 2. This certification action is not intended and shall not be construed to apply to any discharge from any activity involving a hydroelectric facility requiring a Federal Energy Regulatory Commission (FERC) license or an amendment to a FERC license unless the pertinent certification application was filed pursuant to 23 CCR subsection 3855(b) and the application specifically identified that a FERC license or amendment to a FERC license for a hydroelectric facility was being sought. 3. The validity of any non-denial certification action (Actions 1 and 2) shall be conditioned upon total payment of the full fee required under 23 CCR section 3833, unless otherwise stated in writing by the certifying agency. California Environmental Protection Agency The energy challenge facing California is real. Every Califomian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs, see our Web-site at http://www.swrcb.ca.gov. Recycled Paper File No. 06C-007 ADDITIONAL CONDITIONS: In addition to the three standard conditions, the City of Carlsbad shall satisfy the following: A. GENERAL CONDITIONS 1. The City of Carlsbad shall, at all times, fully comply with the engineering plans, specifications and technical reports submitted with this application for 401 Water Quality Certification and all subsequent submittals required as part of this certification. 2. The City of Carlsbad shall maintain a copy of this certification at the project site so as to be available at all times to site personnel and agencies. 3. Prior to the start of the project, the City of Carlsbad shall educate all personnel on the requirements in this certification, pollution prevention measures, spill response, and best management practices. 4. The City of Carlsbad shall permit the San Diego Regional Water Quality Control Board (SDRWQCB) or its authorized representative at all times, upon presentation of credentials: a. Entry onto project premises, including all areas on which wetland fill or wetland mitigation is located or in which records are kept. b. Access to copy any records required to be kept under the terms and conditions of this certification. c. Inspection of any treatment equipment, monitoring equipment, or monitoring method required by this certification. 5. The City of Carlsbad shall notify the SDRWQCB within 24 hours of any unauthorized discharge to waters of the U.S. and/or State; measures that were implemented to stop and contain the discharge; measures implemented to clean-up the discharge; the volume and type of materials discharged and recovered; and additional BMPs or other measures that will be implemented to prevent future discharges. 6. The City of Carlsbad shall, at all times, maintain appropriate types and sufficient quantities of materials onsite to contain any spill or inadvertent release of materials that may cause a condition of pollution or nuisance if the materials reached a waters of the U.S. and/or State. 7. The City of Carlsbad shall dispose of the dredge material at a contained upland location, or provide a plan, including text description and figures, indicating how containment of dredge materials will occur at all sites where dredge material may be stockpiled. The plan shall include a delineation of all waters of the US/State within the vicinity of the stockpiles. This plan will be provided to the SDRWQCB for review prior to initiating dredging activities. 2 of 13 File No. 06C-007 8. Dredge material shall not be deposited in a location that may cause significant adverse effects to aquatic life, fish, or wildlife or may harm the beneficial uses of the receiving waters. 9. This Certification is not transferable to any person except after notice to the Executive Officer of the SDRWQCB. The applicant shall submit this notice in writing at least 30 days in advance of any proposed transfer. The notice must include a written agreement between the existing and new owner containing a specific date for the transfer of this Certification's responsibility and coverage between the current discharger and the new discharger. This agreement shall include an acknowledgement that the existing owner is liable for compliance and violations up to the transfer date and that the new owner is liable from the transfer date on. 10. In the event of any violation or threatened violation of the conditions of this certification, the violation or threatened violation shall be subject to any remedies, penalties, process or sanctions as provided for under state law. For purposes of section 401(d) of the Clean Water Act, the applicability of any state law authorizing remedies, penalties, process or sanctions for the violation or threatened violation constitutes a limitation necessary to assure compliance with the water quality standards and other pertinent requirements incorporated into this certification. 11. In response to a suspected violation of any condition of this certification, the SDRWQCB may require the holder of any permit or license subject to this certification to furnish, under penalty of perjury, any technical or monitoring reports the Regional Board deems appropriate, provided that the burden, including costs, of the reports shall be a reasonable relationship to the need for the reports and the benefits to be obtained from the reports. 12. In response to any violation of the conditions of this certification, the SDRWQCB may add to or modify the conditions of this certification as appropriate to ensure compliance. 13. This certification authorizes sediment removal activities only. This certification does not authorize the construction of any structure within Agua Hedionda or Calavera Creek, nor does it authorize any widening, armoring or realignment of any waters of the US/State. B. TURBIDITY MONITORING PROGRAM 1. To ensure that the emergency dredging project does not adversely affect the beneficial uses of Agua Hedionda Creek, the City of Carlsbad shall develop and implement a Turbidity Monitoring Plan to measure turbidity levels above and below the dredging project site. Turbidity monitoring shall continue until such a time that emergency dredging activities have been completed. The turbidity monitoring program shall be developed and submitted to the Regional Board for acceptance prior to initiation of dredging. Hourly turbidity levels shall not exceed the following limits: 3 of 13 File No. 06C-007 Background Turbidity 0-50 MTU 50-100 NTU Greater than 100 NTU Maximum Increase 20% over background turbidity level 10 NTU 10% over background turbidity level 2. The City of Carlsbad shall immediately assess the results of each sampling event, and if the results of the downstream site exceed the maximum allowable increase in turbidity, the City of Carlsbad shall conduct an immediate assessment of erosion and sediment control best management practices being implemented on-site. The City of Carlsbad shall: a. Repair or replace any BMP that has failed. b. Maintain any BMP that is not functioning properly due to lack of maintenance. c. Evaluate whether additional or alternative BMPs should be implemented to prevent further exceedences of turbidity levels. d. Report to the Regional Board within 2 working days the actions taken to remedy the situation. 3. The City of Carlsbad shall retain all turbidity monitoring data, and report the results of the monitoring program to the SDRWQCB at the conclusion of dredging activities. C. MITIGATION 1. Mitigation for permanent impacts to 0.8 acres of vegetated waters of the U.S. will be achieved at a 3:1 ratio, consisting of the creation of 1.6 acres of wetlands within the Carlsbad Hydrologic Unit, and the enhancement or restoration of 0.8 acres of wetlands within the Carlsbad Hydrologic Unit. 2. Mitigation for temporary impacts to 4.2 acres, will be achieved at a 1:1 ratio, by the enhancement of 4.2 acres of waters of the U.S./State within the Carlsbad Hydrologic Unit. 3. Within 120 days of the issuance of this certification, the City of Carlsbad shall develop and submit a Final Wetlands Mitigation and Monitoring Plan for SDRWQCB approval, that shall be consistent with Conditions C.I and C.2 above, and shall achieve the following performance standards: a. Created wetlands that are installed to compensate for impacts to jurisdictional wetland areas must posses the three criteria (wetland hydrology, hydrophytic vegetation, and hydric soils) necessary to be delineated as a Corps jurisdictional area; b. All mitigation sites shall be maintained 95 percent free of exotic/nonnative plant species; c. All mitigation sites must be self-sustaining; and 4 of 13 File No. 06C-007 d. All mitigation sites must exhibit evidence of natural recruitment of native wetland and/or riparian species. 4. Implementation of mitigation shall provide the following functional gains: a. Habitat function - Creation of structurally and spatially diverse habitat surrounding riparian areas will provide nesting and foraging grounds for birds, amphibians, and other wildlife. b. Biogeochemical/water quality functions - Expansion of wetland areas shall increase areas for natural water quality functions, such as microbial action that removes toxins, nitrogen, and other nutrients from runoff. c. Hydrologic functions - Expansion of wetland areas will allow greater flood flow attenuation, energy dissipation, and storage during storm events. 5. The Final Wetlands Mitigation and Monitoring Plan shall include function-based success criteria. Criteria may be based on Function-Based Performance Standards for Evaluating the Success of Riparian and Depressional/Emergent Marsh Mitigation Sites (Prepared by PCR Services Corporation for the U.S. Army Corps of Engineers, Los Angeles District; 1999), or equivalent functional analysis. Functional analysis shall include, but not be limited to: structural diversity, coverage, and spatial density of habitat; percent of exotic and invasive vegetation present; hydrologic regime of the riparian zone; hydrologic support; saturation duration; micro and macro topographic complexity; and vegetation roughness and organic carbon. Ultimate success of the mitigation areas will be determined by the attainment of the target scores. 6. The Final Wetlands Mitigation and Monitoring Plan shall include construction plans and specifications that include, but are not limited to, the following: a. Proposed channel designs and earthwork for all mitigation areas, including appropriate cross sections and plan views; b. A detailed planting plan, including species lists, plant sizes and numbers, and planting designs; c. Detailed implementations schedule, including but not limited to, dates for initiation and completion of mitigation installation at different on-site and off-site mitigation areas, recordation of conservation easements; initiation of monitoring period; reporting dates, etc.; d. An irrigation plan; e. Signage and barrier designs adequate to prevent intrusion into mitigation areas and creek buffer zones; f. Specific details regarding hydrologic and biogeochemical monitoring, including function-based performance standards, sample locations, periodicity, and qualitative and quantitative indicators; and g. All other information, as appropriate. 7. No Later than 90 days after SDRWQCB acceptance of the Final Mitigation Plan, the City of Carlsbad shall provide a draft preservation mechanism (e.g. deed restriction, 5 of 13 File No. 06C-007 conservation easement, etc.) that will protect all mitigation areas and their buffers in perpetuity. The conservation easement or other legal limitation on the mitigation property shall be adequate to demonstrate that the site will be maintained without future development or encroachment on the site or which could otherwise reduce the functions and values of the site for the variety of beneficial uses of waters of the U.S. that it supports. The conservation easement or other appropriate legal limitation shall prohibit, without exception, all residential, commercial, industrial, institutional, and transportation development, and any other infrastructure development that would not maintain or enhance the wetland functions and values of the site. Other infrastructure development to be prohibited includes, but is not limited to, additional utility lines, paved maintenance roads, and areas of maintained landscaping for recreation. The City of Carlsbad shall submit proof of a completed preservation mechanism within one year of the submittal of the draft preservation mechanism 8. The City of Carlsbad shall submit a report (including topography maps and planting locations) to the SDRWQCB within 90 days of completion of mitigation site preparation and planting, describing as-built status of the mitigation project. If the site grading and planting are not completed within six weeks of each other, separate reports will be submitted describing those specific as-built conditions. 9. The construction of proposed mitigation shall be completed within the same calendar year as impacts occur, or at least no later than 9 months following the close of the calendar year in which impacts first occur (e.g., if impacts occur in June 2006, construction of mitigation for all impacts must be completed no later than September 2007). 10. Mitigation areas shall be maintained free of perennial exotic plant species including, but not limited to, pampas grass, giant reed, tamarisk, sweet fennel, tree tobacco, castor bean, and pepper tree. Annual exotic plant species shall not occupy more than 5 percent of the onsite or offsite mitigation areas. 11. If at any time during the implementation and establishment of the mitigation area(s), and prior to verification of meeting success criteria, a catastrophic natural event (e.g., fire, flood) occurs and impacts the mitigation area, the City of Carlsbad be responsible for repair and replanting of the damaged area(s). 12. Mitigation monitoring reports shall be submitted annually until mitigation has been deemed successful. Monitoring reports shall be submitted no later than 30 days following the end of the monitoring period. Monitoring reports shall include, but not be limited to, the following: a. Names, qualifications, and affiliations of the persons contributing to the report; b. Tables presenting the raw data collected in the field as well as analyses of the physical and biological data; c. Qualitative and quantitative comparisons of current mitigation conditions with pre- construction conditions and previous mitigation monitoring results; d. Photodocumentation from established reference points; 6 of 13 File No. 06C-007 e. Survey report documenting boundaries of mitigation area; and f. Other items specified in the draft and final Wetland and Riparian Mitigation and Monitoring Plan. 13. For the purpose of determining enhancement mitigation credit for the removal of exotic/invasive plant species, only the actual area occupied by exotic/invasive plant species shall be quantified to comply with mitigation requirements. 14. For purposes of this certification, creation is defined as the creation of vegetated or unvegetated waters of the U.S. where they have never been documented or known to occur (e.g., conversion of nonnative grassland to freshwater marsh). Restoration is defined as the creation of waters of the U.S. where they previously occurred (e.g., removal of fill material to restore a drainage). Enhancement is defined as modifying existing waters of the U.S. to enhance functions and values (e.g., removal of exotic plant species from jurisdictional areas and replacing with native species). D. BENTHIC MACROINVERTEBRATE COMMUNITY ANALYSIS 1. The City of Carlsbad shall develop and implement a five-year Bioassessment Monitoring program to evaluate changes in the benthic macroinvertebrate community in Agua Hedionda Creek resulting from impacts of the dredging project and future planned flood control projects. 2. Bioassessment monitoring and assessment using benthic macroinvertebrates shall be performed using the Targeted Riffle Composite (TRC) method consistent with the latest sampling and analysis methods in the Surface Water Ambient Monitoring Program Quality Assurance Management Plan (SWAMP QAMP). *At a minimum, bioassessment monitoring shall be performed at four sites (assessment stations) in Agua Hedionda Creek (as flow permits) in May/June and October of each year. One assessment site shall be located upstream of the dredging activity, one assessment site shall be located within the dredged reach of Aqua Hedionda Creek, and one assessment site shall be located in a reach of Agua Hedionda Creek downstream of the dredging activity. A control station upstream of the project shall be located and sampled concurrently with the assessment stations. Each assessment site and the control site sampled shall also be evaluated using the core quantitative physical habitat assessment measures consistent with the latest version of the SWAMP QAMP in addition to any additional measures required by the SDRWQCB consistent with the SWAMP QAMP. 1 The SWAMP QAMP is being updated to include these procedures. Current copies of the QAMP may be found at http://www.waterboards.ca.gov/swamp/qamp.html 7 of 13 File No. 06C-007 3. Results of the bioassessment monitoring for benthic macroinvertebrates shall be reported using the Southern California Index of Biotic Integrity as described in Ode et al (2005)2 and shall include an evaluation of the assessment and control sites sampled in comparison to at least one true reference site (least disturbed conditions) as sampled semi-annually in the San Diego Region by the San Diego Co-Permittees per the most recent version of the San Diego County Municipal Separate Storm Sewer System (MS4) NPDES permit Receiving Waters Monitoring and Reporting Program. 4. The five-year Bioassessment Monitoring Program will begin concurrently with the habitat mitigation program pursuant to Section C. of this certification. The bioassessment data and analysis shall be submitted as part of the required habitat mitigation monitoring reports pursuant to Condition C.12 of this certification. 5. The SDRWQCB Executive Officer may make revisions to the Bioassessment monitoring program at any time during the five year monitoring term, and may include changes in sampling or assessment methods, a reduction or increase in the number of locations monitored, or the frequency of monitoring required E. REPORTING 1. All information requested in this Certification is pursuant to California Water Code (CWC) section 13267. Civil liability may be administratively imposed by the Regional Board for failure to furnish requested information pursuant to CWC section 13268. 2. All applications, reports, or information submitted to the Regional Board shall be signed and certified as follows: "/ certify under penalty of law that I have personally examined and am familiar with the information submitted in this document and all attachments and that, based on my inquiry of those individuals immediately responsible for obtaining the information, I believe that the information is true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment." 2 Ode, P., A. Rehn, J. May (2005). A Quantitative Tool for Assessing the Integrity of Southern Coastal California Streams Environmental Management Vol. 35, No. 1, pp. 1-13 8 of 13 File No. 06C-007 3. The City of Carlsbad shall submit reports required under this certification, or other information required by the Regional Board, to: Executive Officer California Regional Water Quality Control Board San Diego Region Attn: 401 Certification; File No 06C-007 9174 Sky Park Court, Suite 100 San Diego, California 92123 PUBLIC NOTIFICATION OF PROJECT APPLICATION: On February 9, 2006, receipt of the project application was posted on the SDRWQCB web site to serve as appropriate notification to the public. REGIONAL WATER QUALITY CONTROL BOARD CONTACT PERSON: Christopher Means California Regional Water Quality Control Board, San Diego Region 9174 Sky Park Court, Suite 100 San Diego, CA 92123 (858) 637-5581 cmeans@waterboards.ca.gov 9 of 13 File No. 06C-007 WATER QUALITY CERTIFICATION: I hereby certify that the proposed discharge from the Agua Hedionda Channel Dredging Project (File No. 06C-007) will comply with the applicable provisions of sections 301 ("Effluent Limitations"), 302 ("Water Quality Related Effluent Limitations"), 303 ("Water Quality Standards and Implementation Plans"), 306 ("National Standards of Performance"), and 307 ("Toxic and Pretreatment Effluent Standards") of the Clean Water Act. This discharge is also regulated under California Regional Water Quality Control Board, San Diego Region, Waiver of Waste Discharge Requirements (Waiver Policy) No. 17. Please note that this waiver is conditional and, should new information come to our attention that indicates a water quality problem, the SDRWQCB may issue waste discharge requirements at that time. Except insofar as may be modified by any preceding conditions, all certification actions are contingent on (a) the discharge being limited and all proposed mitigation being completed in strict compliance with the applicants' project description and/or on the attached Project Information Sheet, and (b) on compliance with all applicable requirements of the Regional Water Quality Control Board's Water Quality Control Plan (Basin Plan). RobertusDate Eecutive Officer Regional Water Quality Control Board Attachments: 1. Project Information 2. Distribution List 3. Location Map 4. Rancho Carlsbad Flood Control Project diagram 10 of 13 Attachment 1 FileNo.06C-007 Applicant: ATTACHMENT 1 PROJECT INFORMATION Mr. Glen Pruim, Public Works Director City Of Carlsbad 1635 Faraday Avenue Carlsbad, CA 92008 N/A Agua Hedionda Channel Dredging Project The proposed dredging project would occur Along 3000 feet of Agua ' Hedionda Creek (see attachment 3) , Creek dredging for flood control purposes /The dredge work will include the removal of 30,000 to 40,000 cubic yards of accumulated sediment in Agua Hedionda Creek and Calavera Creek, located within and adjacent to the Rancho Carlsbad Mobile Home park. Material will be removed by backhoe or excavator, and no grading of access roads will be necessary. Federal Agency/Permit: Army Corps of Engineers Emergency Individual Permit Applicant Representatives: Project Name: Project Location: Type of Project: Project Description: Other Required Regulatory Approvals: California Environmental Quality Act (CEQA) Compliance: Receiving Waters: Impacted Waters of the United States: Dredge Volume: Related Projects Implemented/to be Implemented by the Applicant(s): California Department of Fish & Game Streambed Alteration Agreement California Coastal Commission Jurisdictional Determination On February 6,2006 the City of Carlsbad approved a Notice of Exemption from CEQA for an emergency project Agua Hedionda Creek & Calavera Creek The project will result in permanent impacts to 0.8 acres of wetlands in Agua Hedionda Creek, and temporary impacts to 4.2 acres of Jurisdictional streambed. 30,000 - 40,000 cubic yards of sediment See attachment 4 (Rancho Carlsbad Flood Control Program of Projects) Compensatory Mitigation: Mitigation for permanent impacts to 0.8 acres of vegetated waters of the 11 of 13 Attachment 1 File No.06C-007 Best Management Practices: Public Notice: Fees: U.S. will be achieved at a 3:1 ratio, consisting of the creation of 1.6 acres of wetlands within the Carlsbad Hydrologic Unit, and the enhancement or restoration of 0.8 acres of wetlands within the Carlsbad Hydrologic Unit. Mitigation for temporary impacts to 4.2 acres will be achieved at a 1:1 ratio, by the enhancement of 4.2 acres of waters of the U.S./State within the Carlsbad Hydrologic Unit. Within 120 days of the issuance of this certification, the City of Carlsbad shall develop and submit a Final Wetlands Mitigation and Monitoring Plan for SDRWQCB approval, which shall be consistent with certification conditions. The City of Carlsbad shall dispose of the dredge material at a contained upland location, or prior to initiation of dredging activities, provide a plan, including text description and figures, indicating how containment of dredge materials will occur at all sites where dredge material may be stockpiled. The City will monitor hourly for turbidity during dredging activities, and if turbidity limits are exceeded will re-evaluate the effectiveness of BMPs in place. On February 9, 2006, receipt of the project application was posted on the SDRWQCB web site to serve as appropriate notification to the public. Total Due: $11,250.00 Total Paid (check No. 141046, 2178): $11,250.00 12 of 13 Attachment 2 Fi|e No Q6C-007 ATTACHMENT! DISTRIBUTION LIST Ms. Kari Coler U.S. Army Corps of Engineers Regulatory Branch 16885 W. Bernardo Dr., Suite 300 A San Diego, CA 92127 Mr. Mark Durham U.S. Army Corps of Engineers Regulatory Branch P.O. Box 532711 Los Angeles, CA 90053-2325 State Water Resources Control Board Division of Water Quality 13 of 13 «*•-*«» Agua Hedionda and Calavera Creek Dredging and Improvement Project Dredging Limits com Q Z CMavera Outlet Repair BnsmBJB Basin B J 84 hirh Storm Drain Rnnrlio Cnrlsbnd ConunuiiitY Legend Pnojec t Conuuete hi Plnmiiiig Design Rancho Carlsbad Hood Control Prog'ani of Projects APPENDIX B FIGURES Temporary Upland Dewatering Site Future Developmen Robertson Ranch Master Rancho Carlsbad Project Boundary* Proposed Staging Areas 1 \ "1 Environmentally Sensitive Areas (No Construction/Dredge Work Allowed) Monitoring x Preconstruction and Postconstruction Monitoring Locations • Upstream Monitoring Location t- Downstream Monitoring Location * Project Boundary does not reflect actual creek bank limits of emergency dredge work. All emergency dredge work is permitted to occur only within Agua Hedionda Creek Channel Source: Eagle Aerial 2004; SanGIS. 600 300 0 ^^g^^r 600 Feet Scale: 1 : 7,200: 1 inch = 7,200 feet Figure 1 Turbidity Monitoring Plan, Agua Hedionda Creek Channel Emergency Dredging Agua Hedionda Channel Emergency Dredge Work 2005/OSOaol01/5CK/Mxd/EMERGENCtDREDGE/March 2006 Base Map.mxd SPSlf F6 IB.Marraccini) 3/6/2006 Figure 2. Plan View of Sediment/Turbidigy Protection System, Agua Hedionda Creek Channel Emergency Dredging Project. Figure 3. Profile View of Sediment/Turbidity Protection System, Agua Hedionda Creek Channel Emergency Dredging Project. APPENDIX C HORIBAU-10 WATER QUALITY MULTIMETER SPECIFICATIONS Explore the future WATER QUALITY CHECKER U-10 \^r~ Simple, Handy Instrument Contains Powerful Sensor for S The Horiba U-10 water quality checker brings laboratory accuracy and the ease of push-button operation to water quality measurement in the field. Six parame- ters can be measured : pH, temperature, dissolved oxygen, electrolytic conduc- tivity, turbidity, and, salinity. Featuring a powerful sensor and state-of-the-art- functions, the U-10 makes it easy to get highly reliable water quality data simply and quickly just by submersing the sensor in the water. The U-10 is flexible enough to use for cheeking the quality of a broad range of water samples, from factory effluent to urban drainage, river water, lake and marsh water, aquatic culture tanks, agricultral water supplies, and sea water. The main unit is water- resistant, so it can be used safely even in the rain. Automatic calibration function calibrates the instrument simply at the touch of a button for more high- ly reliable data what used to be a complicated calibra- tion process is now easy. Just fill the supplied beaker with the standard solu- tion, immerse the sensor and press a button once for one-point calibration for each of the four parameterijili^i(Si»B« ductivity, turbidity and DO. 'tp^Mttlt calibration is also possible should more precise data be required. Automatic salinity correction functio makes it possible to measure DO in both fresh water and salt water It is now possible to measure DO in either fresh or salf water with the same instrument. When meauring DO in salt water, it will automaticaly measure the salt concentration and make the salinity correction. It is also possible to set.fi freely selectable salinity correction fac- tor of between 0 and 4 20 samples of data on 6 parameters can be stored in memory to be recalled later for display and print out Store the results of measurement of all six parameters for up to 20 samples. There is no need to record measured values on site. Data stored in memory can be recalled and displayed at any time, and can even be simultaneously printed out on any standed prir»6W by- connecting it to the Centronicsr-spsip- cation printer output terminals. Simultaneous Measurement of Six Parameters Expanded display function handles any need for more precise data If more precise data is needed, select the expanded display mode to display data on any para- meter to we Temp, sensor pH sensor (reference electrode) Direct-submersion sensor, no need samples : 11-10 sensor measures by being submersed in the river, sea or water. Forget troublesome sam- pling. The standard cable length is two meters, but the sensor is constructed to be able to withstand water pressure at depths of up to 10 meters and is thus suitable for an even wider range of appli- cations if used with the optional 10-meter cable. Data back-up function keeps data safe even if batteries run down The U-10 features a data back-up func- tion to ensure that precious data is never lost by accident. Sensor calibration values and stored data remain safely in the memory even if the batteries run down. No need to worry even if you forget to switch off the power Attention to the smallest detail has result- ed in an automatic energy-saving function that switches the instrument off automati- cally any time 30 minutes pass without any key being pressed. Carrying case, (included) Powerful sensor gives precise data pH Glass electrode. The glass electrode and reference electrode are of the cartridge type so they are simple to replace and require no maintenance. Conductivity Alternating four-electrode cell resistant to the effect of polarization. Gives reliable, stable data even at high, concentrations. Range switches automatically to the most appropriate of three — 0-1 mS/cm, 1-10 mS/cm, or 10-100 mS/cm — depending upon the sample. Turbidity Ratio of transmitted to scattered light. The light source is an LED. This method gives a broader meaurement range than optical systems based purely on transmitted light or scattered light and is little affected by particle coloration, thus giving highly dependable data. DO Membrane/galvanic cell. Capable of sta- ble data display, unaffected by coexisting gases other than oxygen. The electrode is of the cartridge type. Temperature Thermistor. Can measure from 0 to 50°C. Also used for automatic temperature compensation when measuring pH, DO and conductivity. Salinity Computed from conductivity data. Mea- surement range is 0 to 4 percent. SPECIFICATIONS Parameters Principle Range Resolution Standard Expanded Repeatability Temp, compensation Calibration Display Printer output Power Sensor assembly Weight pH Glass electrode 0-14 pH 0.1 pH O.OIpH ±0.05pH 0-50 'C Auto one-point calibration, manual two-point calibration Conductivity Alternating four-electrode 0— 100mS/cm (mS/cm) (mS/cm) 0-1 0.01 1-10 0.1 10-100 1 (mS/cm) (mS/cm) 0-1 0.001 1-10 0.01 10-100 0.1 ±1%of full scale 0-50'C Auto one-point calibration, manual two-point calibration Turbidity Scattering/ transmitting light 0-800 NTU 10NTU 1 NTU ±3%of full scale - Auto one-point calibration, manual two-point calibration Dissolved oxygen Membrane/ galvanic cell 0-19.9 mg/« 0.1 mgl i 0.01 mg/l ±0.1 mg/l o-4or Auto one-point cali- bration(air), manual two-point calibration Temperature Thermistor o-sor 1 'C 0.1 'C ±0.3'C - - Salinity I' Alternating "I* I four-electrode J 0-4 % 0.1 % 0.01 % ±0.1 % - - LCD Centronics Battery 6F22(S-006P)X1pc. Standard : sensor with 2 m cable, Optional : sensor with 10 m cable Main unit : approx. 400g (0.9 Ib), Sensor assembly (2 m cable) : approx. 800 g (1 .8 Ib) * Salinity is calculataed from the conductivity data. Dimensional Outlines unit 11', NO. 3 BftTE / / Ptf,. :<G» -•3.92*4. Si 25.5fl»22 Data stored in memory can be printed out on any printer with Centronics interface. •7 • 8 *ta 8 a * h «,sr 9 s P.6} oo o n1 U J -41 . Please read the operation manual before using this product to assure safe and proper handling of the product. •The contents of this catalog are subject to change without prior notice, and without any subsequent liability to this company. •The color of the actual products may differ from the color pictured in this catalog due to printing limitations. • It is strictly forbidden to copy the content of this catalog in part or in full. /HUKII Head Office Miyanohigashi, Kisshoin Minami-ku, Kyoto, Japan Phone: 81 (75)313-8123 Fax: 81 (75) 321-5725 • HORIBA INSTRUMENTS Pte. LTD.10Ubi Crescent *05-11/12, UbiTechpark Singapore 408564 Phone: 65 6745-8300 Fax:656745-8155 • HORIBA INSTRUMENTS LIMITED Kyoto CloseSummerhouse RoadMoulton Park, Northampton NN36FL, U.K. Phone: 44 (1604) 542500Fax: 44 (1604)548699 CpjWl, http://www.horiba.com e-mail: info@horiba.co.jp Tokyo Sales Office 1-7-8 Higashi-Kanda Chiyoda-ku, Tokyo, Japan Phone: 81 (3)3861-8231 Fax: 81 (3) 3861-8259 • HORIBA INSTRUMENTS lf> Irvine Facility17671 Armstrong Avenue Irvine, CA 9261 4, U.S.A. Phone: 1 (949) 250-481 1 Fax: 1 (949) 250-0924 Head OfficeHans-Mess- Sir. 6 D-61440Oberursel/Ts.Germany Phone: 49 (6172) 1396-0Fax: 49 (6172) 137385 Beijing Representative Office Suite 1409, Tower B, COFCO Plaza, No. 8, Jianguomennei Avenue, Beijing, China, 100005 Phone:8610-6522-7573 Fax: 86 10-6522-7582 Ann Arbor Facility5900 Mines Drive Ann Arbor, Ml 48108 U.S.A. Phone: 1 (734)213-6555 Fax: 1 (734)213-6525 Leichlingen FacilityJulius-kronenberg Strasse D-42799 LeichlingenGermany Phone: 49 (2175) 8978-0Fax: 49 (21 75) 8978-50 Shanghai Representative Offic UnitFI 16F Jiushi Fuxing Mansion, No. 918, Huaihai Zhong Roai Shanghai, China, 200020 Phone: 86 21-6415-3689/90 Fax:8621-6415-9746 • HORIBA /STEC INCORPORATED1080 E. Duane, Suite. A Sunnyvale, CA 94086 U.S.A. Phone: 1 (408) 730-4772 Fax: 1 (408) 730-8975 HORIBA FRANCE Rue L et A. Lumiere Technoparc F-oi630St-Genis-Pouilly FrancePhone: 33 (4) 50-42-27-63 Fax: 33 (4) 50-42-07-74 :e Taiwan Representative Office No.15Alley6, Lane 485, Sec. 1, Kuang Fu Rd.,i, Hsin-Chu, Taiwan, R.O.C. Phone: 886 (3) 5799143Fax: 886 (3) 5799164 Kaplanstrasse 5 A-3430 Tulln, Austria Phone: 43 (2272) 65225 Fax: 43 (2272) 65230 HORIBA SWEDEN Hertig Carlsvag 55-57 S-15138S6dertaljeSweden Phone: 46 (8) 550-80701 Fax: 46 (8) 550-80567 Explore the future - 2003 112-6Sogong-DongChoong-ku, Seoul, Korea Phone: 82 (2) 753-7911Fax: 82 (2) 756-4972 HORIBA CZECHIA Organizachi slozka PrahaPetrohradska 13 CZ-101 00 Praha 10, Czech Republic Phone: 420 (2) 717-464-80 Fax: 420 (2) 71 7-470-64 HORIBA ITALY EuropalaceCorso Torino 43/45 10043 Orbassano,Torino,ltaly Phone: 39 (01 1)9040601 Fax: 39 (01 1)9000448 |iuTletin:HFIE-1876Dl Printed in Japan ZH-R(SK)33 APPENDIX D FIELD DATA COLLECTION LOG Turbidity Monitoring for Agua Hedionda Creek Emergency Project Weather Conditions: Time Turbidity Flow (military) (NTU) (ft/sec)Comments Date: Monitor: DN- UP- Time Turbidity Flow (military) (NTU) (ft/sec) Comments DN- UP- Time Turbidity Flow (military) (NTU) (ft/sec) Comments DN- UP- Time Turbidity Flow (military) (NTU) (ft/sec) Comments DN- UP- Time Turbidity Flow (military) (NTU) (ft/sec) Comments DN- UP- Time Turbidity Flow (military) (NTU) (ft/sec) Comments DN- UP- Time Turbidity Flow (military) (NTU) (ft/sec) Comments IDN- UP- Time Turbidity Flow (military) (NTU) (ft/sec) Comments DN- UP- Time Turbidity Flow (military) (NTU) (ft/sec) Comments DN- UP- Time Turbidity Flow (military) (NTU) (ft/sec) DN- UP- Comments General Comments: