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,i. G FRN,; �!T SERVICE <br /> CI OCT -3 AM 10* 49 <br /> CONDOR EARTH TECHNOLOGIES INC. <br /> September 30, 1996 RO. B Brian Lane <br /> P.O. Box 3905 <br /> Sonora, CA 95370 <br /> California Regional Water Quality Control Board (209) 532-0361 <br /> Central Valley Region FAX (209) 532-0773 <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> Attn: Ms Polly Lowry - Associate Engineering Geologist <br /> INTERIM REPORT ON GROUNDWATER EXTRACTION EFFECTIVENESS, <br /> TRIPLE E PRODUCE FACILITY <br /> On behalf of Triple E Produce we submit the above referenced report. It has been <br /> prepared in response to your request contained in correspondence dated June 14, 1996. <br /> The groundwater elevations and chloroform concentrations from the monitor wells are <br /> listed in tables and plotted on graphs for your convenience. Historical hydroaraphs show- <br /> that an annual dip in the local water table occurs each year in late spring and early <br /> summer. This is typically followed by a period of recovery in the summer months. Any <br /> effects of drawdown from extraction would be superimposed on this seasonal fluctuation. <br /> More definitive evaluation will be possible after a year of data has been acquired, <br /> permitting comparison of groundwater elevations from similar times of the year. <br /> Aeration of groundwater in the pond has been effective at reducing chloroform <br /> concentrations of extracted groundwater from 79 ug.il or greater to 4.5 uJi or less. <br /> Sincerely, <br /> i <br /> John H. Krame <br /> Senior Hydrogeologist <br /> cc: Tom Guido, Triple E Produce <br /> Michael Campos, Graham and James LLP <br /> Bob Dixon, Condor <br /> Mike Inform, San Joaquin County PHD-EHD <br /> \\Condor_1\sys\,PROlECr\0809\Covlet l.doc <br /> ENVIRONMENTAL 0 GEOLOGICAL ENGINEERING GEOTECHNICAL <br />