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THOMAS R. FLINN <br />DIRECTOR <br />9��FORa <br />THOMAS M. GAU <br />CHIEF DEPUTY DIRECTOR <br />MANUEL SOLORIO <br />DEPUTY DIRECTOR <br />STEVEN WINKLER <br />DEPUTY DIRECTOR <br />ROGER JANES <br />BUSINESS ADMINISTRATOR <br />July 2, 2007 <br />Mr. Todd Del Frate <br />California Regional Water Quality Control Board <br />Central Valley Region <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, California 95670-6114 <br />e <br />SUBJECT: BORING LOGS, FOOTHILL SANITARY LANDFILL <br />Dear Mr. Del Frate: �Jil <br />P. O. BOX 1810 - 1810 E. HAZELTON AVENUE <br />STOCKTON, CALIFORNIA 95201 <br />(209) 468-3000 FAX (209) 468-2999 <br />www.sjgov.org/pubworks <br />As you requested, enclosed are copies of the boring logs for soil gas wells SG -3 and SG -4. I <br />think it very interesting that we see the sand lens at SG -3 where we do not find combustible gas, <br />but we do not see that lens at SG -4, where we often detect combustible gas. I think we seethe <br />same silty clay strata at both wells. <br />If you have any questions, please call me at (209) 468-8504. <br />Sincerely, <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />WMC:kb <br />NAI Foothiff\GX-10 June 07\TDelFrate01-BoringLogs.doc <br />Enclosure <br />c: Robert McClellon, Environmental Health Department <br />LA 31109 <br />