ࡱ> jli ,bjbjVV ;g<<$22uuuuu\_C:qqqqqLLLBBBBBBB$E;H>CuLLCuuqqC___uquqB_B__V>0Aq+&}F?$B/C0_C?@yHyHHAyHuALh_FTGLLLCCLLL_CyHLLLLLLLLL2 ;: Minutes Informational Meeting St Helena Wastewater Treatment Ponds October 26, 2010 10:00 2:30 ATTENDEES City of St Helena: Wayne Daugherty (Operations), John G. Ferons (Public Works), Mary Neilan (City Manager), Michael Sample (Operations), John Draper (Planning) Consultants:, Jim Connell (Wes Yost), Kristine Corneillie (Larry Walker) RWQCB, San Francisco Bay Region: Blair Allen (Watershed Management), Laurent Meiller (Enforcement), Tong Yin (NPDES) USEPA: Charlotte Ely, Hilary Finck (Sustainable Water Infrastructure), Eugenia McNaughton (Quality Assurance) PLANT TOUR The group (minus Mary Neilan) took a tour of the Wastewater Treatment Plant including the office and data center, headworks, flow metering (to headworks) ponds 1A (not in use currently), 1B (2 deep areas separated by a weir with brush aerators) and influent flow chamber to ponds, pond 2 (algae high rate pond, not in operation), pond 3 (algae settling, not in use), pond 4 (storage), pond 5 and chlorine contact chamber, outflow to pond 5 storage, irrigation spray fields, outflow to river. Reviewed the operation of the plant, described various elements, including data collection, flow measurements, influent treatment path through the system, erosion repair, chlorine contact operation. Conclusion: Plant is in good condition and operates reliably most of the time. CURRENT PLANT CONDITIONS Operational and/or maintenance issues Disinfectionstill meeting regulatory requirements, but having issues 2006not allowed to use chlorine gas use sodium hypochloride insteadbecame problem in August 2006 Michael looks into using bacteria to assist pH drops from 8.5 to 6.7 with bacteria use bacteria stop working in 2007temperature sensitive 2007carbon dioxide used before water goes into rapidmixerlowers pH by 0.3 2009tried Peracetic acid in lab setting Does not work well and is expensive HCl acid does work to lower pH Peroxide does not work at all Many WWTPs moving to sodium hypochloride with sodium hypobromide Can cause salinity (selenium?) issues pH goes up and down seasonallyhighest in July thru Oct Ozone unit seems to work best All secondary WWTPs are having issues since chlorine gas was prohibited Algae levels have been major issue Home wine operations have huge impact on wastewater system, especially during crush No way to offset this currently Related issues: sewer replacement schedule Sewer system is old: I & I issue New policy says any new development has to offset flow $160,000 for capital improvements not enough City has three funds: city, sewer, water So far no ARRA or grants for assistance Applying to USDA for possible funding IN HOUSE PROPOSALS TO IMPROVE RELIABILITY OF PERFORMANCE Get pond 1A working like 1B Clean out ponds, make 1A deeper, line the ponds Apply biosolids (sludge) to field o Project-specific permit may not be needed. SWRCB has issued a General Order. o Application must be submitted to and approved by RWQCB. Use pond 2 as it was designed Get algae growing in pond 2 Make it shallower Use brush aerators to keep algae suspended Get nutrients down (algae will take up nutrients) Use pond 3 as designed (as an algae settling pond) Pond 4water must be as clean as possible before going to contact chamber Need to shade the water to keep algae down Contractor evaluated using cover (too big an area to cover), bird balls (better solution) Considered shade structure with solar array, too heavy, expensive Wayne would like to use filters Operators need to have real time water quality monitoring information to be in compliance REVIEW OF CHANGES TO PLANT HISTORICAL AND PROPOSED 1966 - originally no irrigation, just flow to river 1987 disinfection begun 1980s add aeration 1994 - 5 aerators, but only needed to run 3 or 4 most of the time 1996 - pond 1B built for industrial strength wastewater 2007 - started running 1B by itself saved money and manpower new brush aerators have helped 2008 - feasibility study for a Type II AIPS pond: take out the HRP (pond 2) to reduce algal growth, pipe pond 1B effluent to pond 4, cover 4 with bird balls What was the plan after taking 1A offline? Do the irrigation fields need work? More rainbirds to get more evaporation Ideas to use portion of field for solar array Need 4-5 acres of array for powerjust so happens that pond 4 is 4-5 acres, but putting solar array on top of pond was too expensive Needs to be self sustaining, not necessarily profitable Proposal for redwood farm in reclamation field20-year growing cycle; proponent seems to have done a great deal of research on this; might be worth reviewing Alfalfa - too expensive, wouldnt balance cost Horse community expressed concerns about source of water Field prep is problem in order to grow crops Groundwater levels range from 5 to 21 feet seasonally What about tertiary? The City asked Public Works to review this issue City has the highest water use/capita in the Valley Biggest users are the school and the two parks near the plant There is sufficient space, but not the funding Is it a serious proposal? Good goal to pursue, but storage is a problem Cant build on flood plain Problem: there is the idea, (not factually based), that no one wants to use reclaimed water People already have wells that produce enough Might only have seasonal customers What about water conservation? Contested in plan City thinks it will take too long and that people wont do it Blair points to success of EBMUD (made mandatory, people complied within two months) Must offset certain levels seasonally Tiered water pricing is being used Built into sewer rate increase Could use an education program to change behavior Specific Issues Flow monitoring This issue was explained sufficiently during the Plant Tour. Effluent discharge Landdischarge procedures, monitoring and reporting Submit waste discharge report, including a description of the willow farm and fish pond uses City is not using the correct sprinklers or using whole field as EPA grant required Figure out water balance How much can field absorb? Consider partial flow for tertiary instead of whole flow stream Potential for algae harvesting (biosolids, biofuels, etc.) more of a mainstream idea these days Discharges to land during rainfall Not supposed to do it Waynes issues: Difficult to keep lab work and levels right during rainfall Only 2 people working 24/7 during rainfall Wayne is concerned about water quality when discharging to river during rainfall Quality changes too quickly Takes 5 days or longer for lab work (BOD5) Without filtration, cant control the quality OTHER Discharge flexibility discussion indicates that current situation needs to be improved so that river discharge can be managed more reasonably. Potential to review pathogen indicator requirement relates to the E. coli reporting requirement. It may not be the best indicator, but it is still generally used. If there is interest, EPA might be able to do a study of effluent bacteria using molecular techniques to identify sources. Sludge removal see discussion above. Future water quality requirements: Nutrients? Other? ammonia to the river, nitrates to ground water. City is monitoring currently; is this sufficient? Potential funding sources EPA has some programs that may be able to provide funding to help the City obtain a supervisory control and data acquisition system (SCADA). MEETING ADJOURNED AT 2:00 PM. NO FUTURE MEETING SCHEDULED. SUMMARY OF ACTION ITEMS Issue: Storm water management EPA (Charlotte) will send the city information on the EPA rain collection program. This item relates to reducing storm water inflow into the sewer system. Status: Charlotte has sent this information. Issue: Land disposal of sludge Regional Board (Blair) will send the City (Michael) SWRCB guidance on land disposal of sludge. Blair, would you please send Eugenia a copy as well? Issue: History of operations and processes Related to the 2008 feasibility study for a Type II AIPS pond: the suggestion to take out the HRP (pond 2) to reduce algal growth, pipe pond 1B effluent to pond 4, cover 4 with bird balls: What is the status of this plan?(Jim) Clarification: What was the long-term plan for pond 1A? (Jim, Michael or John F, notetakers are asking the question in order to clarify the notes.) Issue: Use of Rainbirds on irrigation field EPA (Hilary and Eugenia) will review grant to St Helena to clarify issue of type of irrigators; Status: The only records of direct EPA grants to the City date back to 1988, some time before the Rainbirds were put in place. Perhaps the City can find this information. The City (Michael) will send RB (Blair) the study of water quality of spray. Issue: Flow monitoring description and reports The description of how flow is currently monitored should be up dated in future reports and continue to send up dated monitoring information to the RB (Michael). Status: Michael is working on compiling this information. Issue: Automation of data collection during rain events EPA (Charlotte) will send the City information about a program that might be able to fund a SCADA system for the WWTP. 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