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06/05/02 WED 16:12 FAX 1 916 861 0430 SECOR-SACRAMENTO Z004 <br /> .� California Regional Water Quality Control Board <br /> Central Valley Region <br /> Vin®ton H.Hickox Robert Schneider,Chair (a <br /> Gray Davis <br /> Secretaryfar Sacramento Main oIIlee Gavemar <br /> 8nvironmental Internet Address: http://www.mwrcb.ca.govtwgcb5 <br /> Proteceloa 3443 Roper Road,Suite A,Sacramento,California 95627.3003 <br /> Phone(916)255.3000•FAX(916)255.3015 <br /> 15 May 2002 COPY <br /> Mr. Jeff Baker <br /> Tesoro Petroleum Companies,Inc. <br /> 3450 S, 344th Way, Suite 100 <br /> Auburn, WA 98001 <br /> REVIEW OF CONFIRMATION SOIL SAMPLING WORK PLAN,TESORO FUEL <br /> TERMINAL, 3003 NAVY DRIVE,STOCKTON, SAN JOAQUIN COUNTY <br /> We have reviewed the 9 May 2002 Work Plan far Confirmation Sampling of Aerated Soil(Work <br /> Plan) submitted by SECOR International Incorporated on behalf of Tesoro Petroleum <br /> Companies,Inc. (Tesoro) for the bulk fuel terminal at 3003 Navy Drive in Stockton(site). The <br /> Work Plan proposes to collect 16 shallow soil samples from the area of the former oil-water <br /> separator that had a release in May 1999,but not grab groundwater samples due to the proximity <br /> of site monitoring wells, Tesoro will collect the samples using a hated auger or shovel from just <br /> below ground surface and analyze the samples for total petroleum hydrocarbons as gasoline <br /> (TPHg),TPHd,benzene, toluene, ethylbenzene,xylenes, and methyl tertiary butyl ether. <br /> We have the following comments on the Work Plan: <br /> I. Although the original confirmation samples did not include sampling for fuel oxygenates, <br /> Tesoro needs to do so for this sampling event. <br /> 2. The Work Plan proposes to collect soil samples from just below ground surface. Tesoro <br /> should vary the depths of the 16 soil samples from just below ground surface to right <br /> above first encountered groundwater,which will provide data from six to about 24 inches <br /> below ground surface. <br /> 3. The Work Plan states that due to the proximity of site monitoring wells, grab <br /> groundwater samples are not needed. Monitoring well TS-10 is the only well in the area <br /> of the 1999 release. The next closest shallow monitoring well(TS/MW-lA) is about 150 <br /> feet West. Based on the difference in concentrations between TS-10 and TS/MW-1A, <br /> Tesoro needs to collect a minimum of three grab groundwater samples from.the area of <br /> proposed confutnation samples. a �� <br /> MAY 17 2002 !J <br /> California.Environmental,Protection Agency <br /> BY .................... <br /> Recycled Paper <br /> The anergy challenge facing California ie era- Every CalMmian umds to take immediate action to reduce energy consumption. <br /> Fm a list of simple ways you can nducc demand and cut your energy costs,see our Web-site at http://www.awwb.ca.govhwgcb5 <br />