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CALIFORNIA GEOPHYSICAL GROUP , INC . <br /> P. O . Box 578341 , Modesto, CA 95357 Tel : (209) 527- 1247 <br /> February 29, 2000 Fax : (209) 527-4810 <br /> Public Health Services <br /> San Joaquin County <br /> 304 East Weber Ave . 3`d Floor <br /> Stockton , CA 95202 <br /> RE : Work Plan <br /> Darpetro, Inc. USA Service Station <br /> 749 E . Charter Way <br /> Stockton , CA <br /> Site No . 1060 <br /> JI On January 10, 2000 , the EHD sent a letter requesting further work at this site. This work plan will <br /> define the work. <br /> On August 5, 1999, we reported the drilling of two wells . One of the wells VW-7 was drilled to a <br /> depth of 80 feet in order to define the depth of contamination . Unfortunately, the contamination at <br /> 80 feet was 24 ug/Kg of Benzene , 43 ug/Kg of Ethyl-benzene, 94 ug/Kg of xylene and 5. 9 mg/Kg <br /> of TPH . San Joaquin County requires that two samples taken 5 feet apart have non-detectable <br /> readings in order to define the depth of contamination . The San Joaquin County Public Health <br /> Services, Environmental Health Division (PHS/EHD) has requested another boring drilled near <br /> well VW-7 to define the contamination below 80 feet. <br /> We are planning to drill one boring to a depth at about 100 feet. The boring will be performed by <br /> V&W Drilling , their drilling License Number is C-57-720904. The boring will be performed with a <br /> Geoprobe drilling machine and the boring will be about 1 inch in diameter. Since the boring is <br /> within 10 feet of well VW-7 , we will only log this well below 60 feet. The logging and soil testing <br /> will be performed continuously beginning at 60 feet and extending down to 100 feet if necessary . <br /> The laboratory testing will be performed by Excelchem Environmental Labs of Roseville, CA with <br /> a mobile laboratory. We will test the soil every 5 feet and when 2 samples 5 feet apart are found <br /> to be clean we will abandoned the boring by backfilling it with cement. <br /> The soil will be tested as follows : <br /> Tests Chemicals Detection Limits <br /> Soil EPA 8020 BTEX 5 ug/Kg <br /> Soil EPA 8015M TPH 1 mg/Kg <br /> i <br /> The Health and Safety Plan will remain the same as in the previous Work Plans. The attached <br /> protocols will be followed . <br /> County <br />