Laserfiche WebLink
21:01 Webster Street <br /> 12th Floor �.. <br /> Oakland, CA 94612 <br /> (51 0) 663-4100 • FAX (51 0) 663-4141 /1� GEOMATRIX " <br /> FF Ll <br /> E23 �4� <br /> February 15,2001 Nl/'q/ 1 <br /> Project 7074:001 P �� /� y� I <br /> Mr. Steve,Shih <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East.Weber, 3rd"Floor <br /> TStockton;California 95202 <br /> Subject: Scope of'Work for Proposed_ Percolation Test.at'1755 West 11th Street <br /> Pombo Perculation Pond <br /> Tracy, California <br /> APN 232-170-07 <br /> Dear Mr. Shih: <br /> Per your request;Geomatrix Consultants,,Inc:,(Geomatrix),has:prepared this letter" on behalf <br /> of Chevron-Environmental Management Company (Chevron)-to describe percolation"tests we <br /> plan to perform at 1755-West 11Th Street, in Tracy, California(the site). The tests will be <br /> performed to obtain information to be used in modeling potential effects of a percolation <br /> `basin above and adjacent o.soil containing residual crude or fuel oil.. Environmental <br /> conditions at the site have been described,in�Geomatrix's December 2000 Soil and <br /> o _ <br /> GroundwaterInvestigation Report(attached). <br /> A total of four.boreholes will be advancedlinto the subsurface using hollow-stem or solid= <br /> stem augers and/or a direct-push drilling method. Two'of the boreholes will be drilled to an <br /> approximate depth of 10'feet below ground,surface (bgs); and two boreholes will be drilled to <br /> approximately 16 feet bgs. At'each borehole_location, four-inch-blank PVC casing will be <br /> installed in the borehole annulus to the maximum.''depth of the borehole, and then`grouted in <br /> place with neat cement. -A series of falling-head tests will then be performed. Following the <br /> testing,augers or direct-pushdrillmg tools.will be placed inside the PVC casing and the <br /> borehole will be"advanced approximately six inches below"the casing. A second series of <br /> falling-head`tests will then be performed. Upon com-Pleti6n:1of the tests, the boreholes will be <br /> destroyed in accordance with applicable State and local requirements. <br /> Enclosed is a permit application and check.for fees($87:00 per,boring;"$348.00 total). We <br /> appreciate your prompt review of our application.' If you have any questions or require <br /> further information;.please contact the undersigned. <br /> Geomatrix Consultants,, Inc. <br /> Engineers, Geologists,:.and Environmental Scientists <br />