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COUNTY OF SAN JOAQUIN <br /> �'•'� ;Z THOMAS R. FLINN <br /> < DEPARTMENT OF PUBLIC WORKS DEPUTY DIRECTOR <br /> P.O.BOX 1810—1810 E.HAZELTON AVENUE MANUEL LOPEZ <br /> STOCKTON.CALIFORNIA 95201 DEPUTY DIRECTOR <br /> (209)468-3000 STEVEN WINKLER <br /> FOR FAX(209)468-2999 DEPUTY DIRECTOR <br /> HENRY M.HIRATA <br /> DIRECTOR <br /> 'op <br /> June 3, 1999 <br /> Wendy Arano <br /> California Regional Water Quality Control Board <br /> Central Valley Region , <br /> 3443 Routier Road f <br /> Sacramento, California 95827 <br /> SUBJECT: FOOTHILL SANITARY LANDFILL GROUNDWATER MONITORING <br /> Dear Ms. Arano: <br /> It was reported in the First Quarter(1999)Monitoring Report for the Foothill Sanitary Landfill that six <br /> volatile organic compounds (VOCs)were detected in samples collected from MW-3. Due to the <br /> uniformity of the concentrations and their relation to laboratory matrix spikes, the County suspected that <br /> the detections were caused by laboratory error and instructed EMCON to re-test the well as soon as <br /> possible. Since it was already time to collect samples for the Second Quarter Monitoring Event, the re- <br /> test is in the form of normal second quarter monitoring. <br /> Results indicate that all VOCs are non-detect in all monitoring wells this quarter. The certified analytical <br /> reports, field data sheets, and chain of custody documentation are attached for your review. These results <br /> will also be submitted with the Second Quarter Monitoring Report prior to July 15, 1999. We believe this <br /> verifies that the VOCs detected during the first quarter were false and that there is no VOC impact on <br /> ground water at the Foothill Sanitary Landfill. <br /> If you have any questions regarding this issue, please call me at(209) 468-3066. <br /> Sincerely, <br /> e <br /> 1 k)"OHNSON <br /> Associate Civil Engineer <br /> WJ:rh <br /> S:\W ES\FMGWMON\2-99v=.wpd <br /> Attachment <br /> c: Robert McClellon, R.E.H.S., Public Health Services, Environmental Health Division <br /> LA 64201 <br />