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ME i <br /> Ms. Mary Meays <br /> San Joaquin County <br /> Re: Tri-Valley Growers, Thornton, CA <br /> August 9, Z992 <br /> Page 2 <br /> No dissolved petroleum hydrocarbon constituents were detected above <br /> detection limits in monitoring wells MWZ <br /> Oil and grease was not detected above de ect�ionW li its in MW5 or61 <br /> (Table 3), The zero lines for total <br /> groundwater is plotted In Figure 7, Petroleum hydrocarbons in the <br /> Influent and effluent samples from the <br /> analyzed for STEX and TPHG on May 21 and on Jgune 119 The for <br /> also <br /> sample was also analyzed for total oil and greasejl:�£TOG)� <br /> Analytical results indicate a drop in STEX levels and a slight rise <br /> In TPHG levels in the influent samples collected. No break-through <br /> from carbon filter 1 (EFFC1 or 2 (EFFC2) occurred <br /> sampling rounds. Sampling was)done using d dicated pne during the <br /> in each well, pneumatic pumps <br /> Laboratory analyses were performed by Applied Analytical Laboratory <br /> (BHS cert, ##1211). The results are summarized in Table 3 and the <br /> ^j laboratory reports and chain-of-custody documentation are presented <br /> ✓ in Attachment 2. <br /> Gradient maps created after system start-up reflect a depression <br /> created by Pumping of the groundwater in monitoring well MW4 <br /> (Figures 4-6), A cone of depression around the <br /> the area of influence are demonstrated in these Pumpimaps well Tand <br /> he <br /> groundwater monitoring results are summarized in Table 2. <br /> The system continues to <br /> liters Pump at a throughput of between 1.8 and 2 <br /> per minute• The zone of influence (capture) exhibited in <br /> gradient data and presented an the gradient ma is r <br /> theoretical value estimated from P greater than the <br /> correspondence dated January 7, 1991).test data (presented e <br /> reflects the Increase in The zone of capture <br /> Pumping rate from the pumping rate used in <br /> the capture zone calculations. Monitoring wells MWl and MW2 which <br /> are downgradient 120 feet and 127 feet, respectively, <br /> Pumping well exhibit a clear influence from of the <br /> Pumping. <br /> WaterWork staff will continue with the <br /> which will include a re ort 4uarterly monitoring program <br /> Quarterly monitoring will include analysis i s system performance. <br /> all wells and remediation system influent and effluent, TPHG and will <br /> also include analysis for TOG from well MWI, <br /> monitor system performance and ad ustWe will continue to <br /> Pumping rate as necessary. <br /> TVOLR731.Vp <br />