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STATE OF CALIFORNIA <br /> PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— R; <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A a <br /> SACRAMENTO, CA 95827-3098 <br /> a <br /> PHONE: (916) 361-5600 i tjr jai °" <br /> FAX: (916) 361-5686 v <br /> D E C 2 4 � <br /> ENVIRONMENTAL HEALTH <br /> PERIMIT/S`:RVICES <br /> Mr. Dave Atwater 19 December 1991 <br /> California Fuels <br /> Post Offi.ce Box 1270 <br /> Stockton, CA 95201 <br /> REPORT OF EXCAVATION AND SOIL STOCKPILE ANALYTICAL TESTING, CALIFORNIA FUELS, 838 <br /> MOKELUMNE STREET, WOODBRIDGE, SAN JOAQUIN COUNTY <br /> We have reviewed your 20 November 1991 response to our 17 October 1991 <br /> requirement that you submit a Work Plan locating the additional soil samples <br /> necessary to establish whether you have completely removed or cleaned up the <br /> polluted soil at 838 Mokelumne Street in Woodbridge. <br /> Your letter refers to Figure 10 in the 16 March 1990 Problem Assessment Report <br /> (PAR), which locates five boreholes. The PAR reports you drilled these <br /> boreholes, and sampled and analyzed the soil from several' depths, prior to <br /> cleaning up the site by excavating and landfarming the polluted soils. Thus, you <br /> estimated the extent of the polluted soil before cleaning it up. This does not <br /> -respond _to_our_ concern whether ,you cleaned, up the polluted site. Substantial <br /> volumes of highly ~' it <br /> g y polluted soil could remain in-place, thereby threatening to <br /> degrade the water quality of the shallow ground water underlying the site. j <br /> As our letter states, the soil sampling and analysis program reported in the <br /> Report of Excavation and Soil Sampling Analytical Testing did not determine <br /> whether you removed, cleaned up or defined the extent of the contaminated soil . <br /> The attached memorandum, also attached to our October 1991 letter, clearly <br /> demonstrates that you obtained an insufficient number of soil samples to <br /> determine if you cleaned up the site. After finding high pollutant <br /> concentrations in soil samples, you should have obtained samples from deeper in <br /> the excavation until pollutants were no lond�er detectable. Instead, you stopped <br /> sampling. a <br /> Therefore, in accordance with California Water Code §13267, by 30 December 1991, <br /> you are required to submit a Work Plan locating additional soil samples necessary <br /> to confirm that all the pollutants have been removed. You should propose to <br /> i <br /> I <br />