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o¢4u'N c COUNTY OF SAN JOAQUIN THOMAS R. TOR <br /> 1.• +'•oG <br /> DEPUTY DIRECTOR <br /> DEPARTMENT OF PUBLIC WORKS <br /> ` P.O. BOX 1810- 1810 E. HAZELTON AVENUE THOMAS M.GAU <br /> • �c4`IFOR�w STOCKTON, CALIFORNIA 35201 DEPUTY DIRECTOR <br /> (209)468-3000 ' <br /> MANUEL LOPEZ FAX(209)468-2999 <br /> DIRECTOR STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> July 31, 2000 <br /> Wendy Arano <br /> California Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827 <br /> SUBJECT: CORRAL HOLLOW SANITARY LANDFILL -EVALUATION OF EXTENT <br /> OF VOC IMPACT <br /> Dear Ms. Arano: <br /> This is regarding the results of the Evaluation of Extent of Volatile Organic Compound (VOC) <br /> impact in the shallow water bearing zone at the Corral Hollow Sanitary Landfill. The work was <br /> performed on June 15 and 16, 2000, in accordance with the approved work plan previously <br /> submitted. Drilling was performed by Gregg Drilling, Inc.; and IT EMCON performed field <br /> monitoring and testing. Attached is a complete report as prepared by IT EMCON summarizing <br /> the work and offering conclusions. As stated in the work plan, three holes were to be drilled to <br /> evaluate whether the shallow water bearing zone extends to the west of the existing monitoring <br /> well. If water was encountered, samples were to be taken and results compared to existing <br /> groundwater monitoring data. However, none of the bore holes produced enough moisture to <br /> obtain a sample. <br /> This investigation seems to verify that the shallow water bearing zone does not extend a <br /> significant distance to the west of the existing MW-5. Also, gas probe sampling results obtained <br /> from this investigation offer more evidence that the origin of VOCs in MW-5 is likely due to <br /> landfill gas migration. As a result, it appears that the most effective and reasonable corrective <br /> action for impact to MW-5 is the installation and operation of the landfill gas monitoring system. <br /> The landfill gas control system project was placed out for bids in June 2000 and construction is <br /> scheduled to begin in September 2000. <br /> If you have any questions regarding the work performed or the attached report, please call me at <br /> (209)468-3066. <br /> Sincer , <br /> WES HNSON <br /> Associate Civil Engineer <br /> WJ:rh <br /> N:\WES\CMGWMON\driliing_results—let <br /> Attachments <br /> c: Robert McClellon, San Joaquin County Environmental Health Division <br /> LA 64201 <br />