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HomeMy WebLinkAboutMINUTES - 07102012 - C.10RECOMMENDATION(S): APPROVE the Contra Costa County Sanitation District No. 6 (SD 6) Final Sewer System Management Plan (SSMP) updated June 14, 2012 as required by the State Water Resources Control Board (SWRCB) and the San Francisco Regional Water Quality Control Board (SFRWQCB) to comply with the Sanitary Sewers Systems Waste Discharge Requirements (WDR). (District V) FISCAL IMPACT: No fiscal impact. BACKGROUND: The State Water Resources Control Board (SWRCB) and the San Francisco Bay Regional Water Quality Control Board (SFRWQCB) require Sanitation Districts to develop and implement Sewer System Management Plans (SSMP) that document the program to properly operate and maintain sanitary sewer systems. On May 2, 2006, the SWRCB enacted Order No. 2006-0003 “Statewide General Waste Discharge Requirements for Sanitation Sewer Systems”. This Order affects APPROVE OTHER RECOMMENDATION OF CNTY ADMINISTRATOR RECOMMENDATION OF BOARD COMMITTEE Action of Board On: 07/10/2012 APPROVED AS RECOMMENDED OTHER Clerks Notes: VOTE OF SUPERVISORS AYE:John Gioia, District I Supervisor Candace Andersen, District II Supervisor Mary N. Piepho, District III Supervisor Karen Mitchoff, District IV Supervisor Federal D. Glover, District V Supervisor Contact: S. COHEN, 925-313-2160 I hereby certify that this is a true and correct copy of an action taken and entered on the minutes of the Board of Supervisors on the date shown. ATTESTED: July 10, 2012 David Twa, County Administrator and Clerk of the Board of Supervisors By: STACEY M. BOYD, Deputy cc: L. Strobel, County Administrator , S. Anderson, County Counsel , W. Lai, Assistant Public Works Director , J. Duffy, Special Districts C. 10 To:Board of Supervisors From:Julia R. Bueren, Public Works Director/Chief Engineer Date:July 10, 2012 Contra Costa County Subject:APPROVE the Contra Costa County Sanitation District No. 6 Final Sewer System Management Plan (District V) BACKGROUND: (CONT'D) all public wastewater collection system agencies in California with greater than one mile of sewer. SD 6 staff reviewed and updated the SSMP for SD 6. In compliance with the Sanitary Sewer Systems Waste Discharge Requirements (WDR), this document addresses the goals; organization; overflow emergency response plan; fats, oil and grease control program; legal authority; measures and activities; design and construction standards; capacity management; monitoring, measurement, and program modifications; SSMP audits; and communications program as required by the regulatory agencies. CONSEQUENCE OF NEGATIVE ACTION: Without the Board of Supervisor’s approval, SD 6 SSMP may be considered invalid by the SFRWQCB, therefore, SD 6 may be subject to enforcement actions due to not being in compliance. CHILDREN'S IMPACT STATEMENT: Not applicable. ATTACHMENTS SD 6 SSMP 06-14-12 Sewer System Management Plan Contra Costa County Sanitation District No. 6 Updated June 14, 2012 By: Julia R. Bueren DISTRICT ENGINEER G:\spdist\Board Orders\2012\7-10\SD6 SSMP 08-31-08 - Revised 6-14-12.doc SEWER SYSTEM MANAGEMENT PLAN TABLE OF CONTENTS INTRODUCTION 3 I. GOALS 3 II. ORGANIZATION 4 III. OVERFLOW EMERGENCY RESPONSE PLAN 5 IV. FATS, OIL, AND GREASE (FOG) CONTROL PROGRAM 5 V. LEGAL AUTHORITY 5 VI. MEASURES AND ACTIVITIES 5 VII. DESIGN AND CONSTRUCTION STANDARDS 6 VIII. CAPACITY MANAGEMENT 7 IX. MONITORING, MEASUREMENT & PROGRAM MODIFICATIONS 7 X. SSMP AUDITS 8 XI. COMMUNICATIONS PROGRAM 8 3 CONTRA COSTA COUNTY SANITATION DISTRICT NO. 6 SEWER SYSTEM MANAGEMENT PLAN (SSMP) INTRODUCTION The Contra Costa County Sanitation District No. 6 (SD 6) is a secondary treatment facility designed to treat an average dry-weather flow (ADWF) of 14,100 gallons per day (GPD); and a peak wet-weather flow (PWWF) of 14,100 GPD. The actual average daily flow is about 8,500 GPD which is entirely domestic sewage. SD 6 serves the Stonehurst subdivision which has a total of 47 houses within it. The SD 6 treatment facility incorporates septic tanks at each lot for primary treatment and retention of solids, grease and oil. The effluent from the septic tanks flows (by gravity and force main) in a small diameter sewer system to recirculation sand filters followed by ultraviolet disinfection f or secondary treatment. For the final step, the effluent is pumped to a subsurface soil absorption system (leach field). This method of secondary biological treatment allows the Stonehurst treatment facility to generate an effluent with consistently (30-day average) less than 15 mg/l biochemical oxygen demand (BOD) and 15 mg/l total suspended solids (TSS); thereby satisfying the requirements of the National Pollution Discharge Elimination System permit. I. GOALS  Continue to professionally manage, operate and maintain all parts of the wastewater collection system, excluding the individual homeowner septic tanks  Provide adequate capacity to convey and treat peak flows  Minimize the frequency of Sanitary Sewer Overflows  Mitigate the impact of Sanitary Sewer Overflows II. ORGANIZATION 4 Reporting Procedure The Contra Costa County Board of Supervisors serves as the Sanitation District No. 6 Board of Directors. The Public Works Director serves as the SD 6 District Engineer. The District Engineer reports directly to the SD 6 Board. The Public Works Department, Special Districts Section staff is responsible for treatment plant and collection system operations and maintenance oversight, fiscal integrity, administration, regulatory compliance and long-term planning. Staff administers outside contracts for day-to-day operations and maintenance and for major design of improvements. BOARD OF DIRECTORS (County Board of Supervisors) COMMUNITY ADVISORY COMMITTEE DISTRICT ENGINEER (Public Works Director) ADMINISTRATION (Public Works Special Districts Section) REGULATORY COMPLIANCE FISCAL OPERATIONS (Contract) MAINTENANCE (Contract) LONG-TERM PLANNING 5 III. OVERFLOW EMERGENCY RESPONSE PLAN Overflow Response — The District has an Overflow Emergency Response Plan that is updated annually and includes procedures for overflow mitigation, emergency response, clean-up, spill recovery, internal and external resources and rehabilitation of damaged dwellings and buildings. It also includes provisions for public notification and testing for contamination and notification to regulators. The plan addresses overflows at lift stations and sanitary sewer collection systems. Overflow Reporting Policy — The District defines an overflow as a raw sewage escape from the public sewer onto public or private property. All overflows are reported to the San Francisco Regional Water Quality Control Board (SFRWQCB). Overflows of less than 1,000 gallons that have no environmental or public health issues are reported to the SFRWQCB in the District’s annual report. Overflows greater than or equal to 1,000 gallons are reported to the California Office of Emergency Services (OES). Other regulatory agencies may need to be contacted depending on the location and extent of the spill (See attachment 1 in Overflow Emergency Response Plan). All overflows, backups, etc., are investigated as to cause and corrective action taken to prevent future incidents. IV. FATS, OILS, AND GREASE (FOG) CONTROL PROGRAM Fats, Oils, and Grease Control (FOG) — To date, the current operations and maintenance contractors have not observed any FOG occurrences. The septic tank at each lot effectively retains the fats, oils and grease generated by each residence. Therefore, the District feels that no FOG control program is needed. V. LEGAL AUTHORITY This section is waived for collection systems that serve a population of 10,000 or less. VI. MEASURES AND ACTIVITIES a. Collection System Map A map of the system is available, superimposed on an aerial photo. Mains, pumping station, manholes and cleanouts are shown. The map is available in electronic format and is derived from a GIS database. b. Resources and Budget Each sewer connection pays an annual sewer service charge of $1,950. This amount is required to both operate the system and fund an operations reserve and reserve for capital replacement. A detailed operating budget is produced each year which breaks out all costs including contract operating services, consumables and staff support services. 6 A Capital Improvement Plan has been developed which lists all capital assets, estimates their remaining useful lives and projects the costs for replacement. The scope of the Operations & Maintenance (O&M) contract for the collection system is as follows:  Respond to sewer calls and complaints. Contact appropriate sewer contractor. Obtain confirmation of arrival time. Do final check after repair is completed.  As Underground Service Alert (USA) Notifications are received, contractor is to review and mark project areas in accordance with the USA North Color Code Procedures. c. Prioritized Preventive Maintenance From time to time small overflows of an extremely localized nature occur in this system. In these cases, the case is usually a break in the pipe, and it is repaired. This system is an unusual one in that each of the 47 houses in the system has a septic tank. This acts as the primary treatment. Effluent flows to a small treatment plant via a two-inch gravity main and a 3-inch force main, where it is treated. The effluent then is pumped to a leach field on a nearby ridge. The homeowners association helps to coordinate regular pumping of each individual septic tank. d. Scheduled Inspections and Condition Assessment The SD 6 collection system is about one mile in extent with part time staff to ma nage and maintain it. It was built in 1991 with small diameter pipe. Regular inspections of a proactive nature are done as part of performing systems maintenance on a weekly basis. e. Contingency Equipment and Replacement Inventories This section is waived for collection systems that serve a population of 10,000 or less. f. Training The contract operator staff attends various training sessions from time to time such as the SSO-WDR Compliance Workshop Electronic Reporting which was also attended by Public Works Department, Special Districts Section staff. g. Outreach to Plumbers and Building Contractors This section is waived for collection systems that serve a population of 10,000 or less. VII. DESIGN AND CONSTRUCTION STANDARDS a. Standards for Installation, Rehabilitation and Repair Since its formation in 1992, SD 6 has not developed its own standards. The system is completely built out. SD 6 would use the revised Standard Specifications for Design and 7 Construction – 1993 Edition published by Central Contra Costa Sani tary District if the need arose. b. Standards for Inspection and Testing of New and Rehabilitated Facilities Land use restrictions prohibit additional residential construction that would tie into this system. Therefore, no new facilities are expected to be required. VIII. CAPACITY MANAGEMENT a. Capacity Assessment This section is waived for collection systems that serve a population of 10,000 or less. b. System Evaluation and Capacity Assurance Plan This section is waived for collection systems that serve a population of 10,000 or less. IX. MONITORING, MEASUREMENT AND PROGRAM MODIFICATIONS A report is prepared annually as part of the RWQCB’s requirements that includes:  Number of SSOs during the previous year  Volume distribution of SSOs  Volume of SSOs contained  SSOs by cause The district’s contract operator keeps staff apprised of infrastructure improvements needed on a continuous basis. The system is an isolated, self -contained system with no provision for additional connections beyond the 47 current c onnections it was designed for. X. SSMP AUDITS This section is waived for collection systems that serve a population of 10,000 or less. XI. COMMUNICATIONS PROGRAM SD 6 staff communicates regularly with the system operator and send s regular updates to the Homeowners Association.