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e <br /> ni <br /> Vv <br /> n1 AATERWORK CORP. <br /> S. <br /> .�, �DVVJJII CAPR 9 FILE <br /> January 7, 1991 <br /> Diane Hinson public Health Services <br /> San Joaquin county <br /> Environmental Health Division <br /> p-p- Box 2009 <br /> Stockton, CA 95201 <br /> Re: Tri Valley <br /> Growers, Plant T, 26200 Nowell Road, <br /> Thornton, CA <br /> Dear Diane: <br /> This letter outlines the rremediation eferenced site (Figura set-up and testing <br /> program at the above refer <br /> In }ate November 1990, the remediation system was set-up n ed <br /> groundwater <br /> existing shed on the connected in see ies consistsExtracted two-hundred <br /> y .� pound carbon filters, co Growers' <br /> waste <br /> is treated through the filters. Treated effluen Crowe hen p P <br /> the carbon <br /> to a storm drain connected to <br /> pical ri Valley <br /> des gn of <br /> collection system (Figure 2). <br /> filtration system is shown on Figure 3. <br /> was started and a pumping test was conducted on the <br /> The systemwells to monitor the <br /> extraction well (mW4) using the outerlying in rate, <br /> effect of pumping on the watertable, the optimal pumpas ing <br /> ed at a <br /> and to acquire aquifer characteristics-for 2lwhourell sw57wminutes. Near <br /> rate of one liter per minute ;lp ) <br /> the end of the pumping test a slight drawdown was noted in all <br /> non-p+�mping wens, but the test duration was insufficient for <br /> wells test data is <br /> interpretation of the drawdown ransmissivityand zone of ca a uis <br /> included in in these <br /> Attachment 1). <br /> were estimated using pump test data. The capture zone <br /> estimated at 91.55 feet downg�xa magnitude was determined prior ient of the extraction eto <br /> (stem Gradient direction and g data is included i <br /> commencement of the pumping test. Pumping groundwater level <br /> Attachment 1. Figure 4 depicts the static g perpendicular to <br /> t direction <br /> contours. Gr. Calculations are contained assumed to <br /> Attachment 2. <br /> contour lines. Ca <br /> ,. based upon the levels <br /> The estimated life of the carbon filters, rate, is 7 months. <br /> -- _.._..tem erature.....and_._..pump ..__g._ <br /> P it. grill -be-out... <br /> of contamination, 1C is nearly spent, <br /> When carbon filter 1 ( regenerated- Filter 2 will be moved to <br /> service and sent to be <br /> 1710 MAIN STREET + ESCALON.CA 95320 • (2og)838-3507 <br /> 2350•A WAL5H AVENUE . SANTA CLARA,CA 95051 . (408)496-1249 <br />