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Mr. Mike Miller <br />June 3, 1996 <br />Page 3 <br />C <br />Project 20B02-001.010 <br />has been fully operational, and the increased pumping may take 3 to 6 months to fully <br />develop its new capture zone. <br />If the increased capture zone developed by the extraction and treatment system intersects <br />well MW -14 and causes the levels of VOCs to increase, the source of the VOCs may not <br />be from the landfill. If the levels of VOCs in well MW -14 decrease within the next <br />6 months, then the source of the VOCs is likely landfill related. <br />At this point in time, we would not recommend any additional investigation until the <br />increased capture zone has been fully developed, which could take as long as 6 months. <br />During this 6 -month period, normal monitoring should be continued, but water levels in all <br />of the monitoring and extraction wells should be measured on a monthly basis to help <br />determine when the capture zone has been fully developed. However, depending on the <br />trends in the VOC concentrations in the monitoring well network, some additional <br />subsurface investigations may be necessary. <br />If you have any questions concerning this subject, please call. <br />Sincerely, <br />EyMCON <br />Elizabeth Sparkman . C. Isham <br />Staff Engineer xecutive Manager <br />Attachments: Table First Quarter 1996 and Retest Analytical Results <br />Drawing 1 Site Plan <br />Certified Analytical Results <br />Table 8 from SWAT Report <br />cc: William J. Marshall, RWQCB <br />Jerry Noma, California Youth Center <br />Ed Padilla, LEA <br />Karen Patche, Office of Real Estate and Design Services <br />Kim Schwab, RWQCB <br />SA0N NPJOvDB02\OB02001 LOGS-96\pas:4 <br />