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• <br /> •...,,j``, EOK.UND G. BROWN JR. <br /> 1 1Sy� <br /> opwRNIA GOVERtIOR <br /> -• <br /> CALIFO <br /> Water Boards <br /> SECRETARY OOORIO EZ <br /> EN VIROHMEHTAL egpTEC iOH <br /> central Ys!!ley Regional Water Quality Control Board <br /> 29 November 2016 <br /> Gary Wert <br /> EEI/WSD <br /> P.O. Box 3805 <br /> Paradise, CA 95967 <br /> VILLA CEREZOS MOBILE HOME PARK, SAN JOAQUIN COUNTY <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff has <br /> reviewed the Wastewater Treatment Facility Planned Modifications report for the Villa Cerezos <br /> Mobile Home Park (MHP) located at 12348 North Highway 99 in Lodi. The review was <br /> requested during a meeting on 21 November 2016. The purpose of the meeting was to discuss <br /> planned changes and upgrades to the existing wastewater system at the MHP, which has been <br /> in operation since the 1960s. Currently, the system consists of a primary tank system with a <br /> polishing filter, a bio-filter, and a sand filter. The effluent from the treatment system flows by <br /> gravity to a series of dry wells (each approximately 25 feet deep) located along the northern <br /> portion of the site for disposal. The existing system is failing and may pose a threat to <br /> groundwater quality. The depth to groundwater beneath the facility is unknown-, however, three <br /> groundwater monitoring wells located less than one mile around the facility show depths to <br /> groundwater between 71 and 91 feet below ground surface. <br /> Based on our review of the report, the planned system will be a package plant where the <br /> sewage is purified by the destruction of the organic compounds by using aeration to oxidize the <br /> volatile material into gas, water, and sludge. The resulting effluent is expected to be clear and <br /> odorless, with an approximate 85% to 90% reduction in biochemical oxygen demand (BODS) <br /> and suspended solids. Additional treatment will be provided with an anoxic process to reduce <br /> nitrogen. The design flow will be 9,000 gallons per day (gpd). <br /> The facility is currently regulated and permitted through San Joaquin County Environmental <br /> Health Department. Due to the low flow rate (<10,000 gpd), no wastewater treatment ponds, <br /> and a low threat to groundwater quality (based on the new system design), it is recommended <br /> that the treatment system continue to be regulated and permitted through the county, as long as <br /> the new system complies with county regulations and the county agrees to continue to permit <br /> and oversee the facility's existing and planned treatment systems. <br /> It should be noted that the Central Valley Water Board does not conduct technical or <br /> engineering reviews of construction plans for wastewater facilities. It is the discharger's <br /> responsibility to work with the county to obtain approval for the construction and engineered <br /> wastewater treatment system plans and to verify that the plans meet the county's required <br /> standards. The standards are in place to ensure systems are adequately designed, located, <br /> sized, spaced, constructed and maintained to prevent creation of a nuisance, ensure there are <br /> no hazards to public health, and to protect potable water supplies, and groundwater, or surface <br /> waters within San Joaquin County boundaries. However, any changes to the planned or final <br /> KARL E. LONGLEY SCD, P.E.,cn:;:,. =;,;,TELA C. CREEOG;. i'._., BCEE,EXEG'.11—C.F DIGER <br /> 1t020 Sun Center Drive#200,Rancho Cordova,CA 95670 1 www.r:aterboards.ca.gov/centralvalley <br /> {,j RECYCLED PAPER <br />