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RESNA WATERWORK CORP. <br /> INDUSTRIES <br /> January 7, 1991 <br /> JAN 18 MOM j <br /> Diane Hinson <br /> San Joaquin County Public Health Services ENVIRJfvi'v1E.N AL HEALTH <br /> Environmental Health L`,rision r�E�;hrZIT/SER,,ICES <br /> P.O. Box 20G9 <br /> Stockton, CA 95201 <br /> k <br /> } <br /> i Re: Tri Val1ey Growers, Plant T, 26200 Nowell Road, <br /> { <br /> Thornton, CA <br /> Dear Diane: <br /> remediation system <br /> This letter outlines the set-up and testing <br /> program at the above referenced site (Figure 1). <br /> In late November 1990, the remediation system was set-up in an <br /> existing shed on the rite. The system consists of 2 two-hundred <br /> pound carbon filters, connected in series. Extracted groundwater <br /> is treated througumped <br /> h the filters. Treated effluent roweris s <br /> Growers <br /> a storm drain connected to ' pwaste <br /> Typical alley the carbon <br /> of <br /> i collection system (Figure 2). <br /> filtration system is shown on Figure 3. <br /> d a pumping test was conducted <br /> The system was started anon the <br /> { <br /> extraction well (MW4) using the outerlying wells to monitor ates t <br /> effect of pumping on the watertable, the optimal pumping <br /> y, and to acquire aquifer characteristics. Well MW was was pumped ata <br /> rate of one liter per minute (lpm) for 21 hours 57 minutes. Hear <br /> the end of the pumping test a slight drawdown was noted in all <br /> non-pumping wells, but the test duration was insufficient for f <br /> N st data is <br /> n these we <br /> interpretation of the drawdownTransmissivityl and zone s (pump sof capture ' <br /> included in Attachment 1). <br /> were estimated using pump test data. The capture zone is <br /> estimated at 91.55 feet downgradient of the extraction well i <br /> (MW4). Gradient h�recum ing t t tion and gni Pumping datdetermined <br /> included in <br /> commencement of t p p roundwater level <br /> Attachment 1. Figure 4 depicts the static g <br /> umed <br /> contours. GradiC Calculations are ass <br /> contained tin At achmenbe t 2 lar to <br /> contour lines. <br /> evels <br /> The estimated life of the carbon filters, based upon the months. <br /> - -- --- um in rate, <br /> � . <br /> of- contamination, ,temperature.. and.. .p.. ..p .g..._....... <br /> When carbon filter 1 (1C) is nearly spent, ' it will be out o - - - <br /> :: service and sent to be regenerated. Filter 2 will be moved to <br /> 1710 MAIN STREET • ESCALON,CA 95320 • (209) $3491249 <br /> 2350-A WALSH AVENUE • SANTA CLARA,CA 95051 (408)496-1249 <br />