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ENVIRO�v'PMENTAL HEALT '� EPARTMENT <br /> SAN JOAQUIN COUNTY <br /> 2 Donna K. Heran, R.E.H.S. Unit Supervisors <br /> a Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> T <br /> Al Olsen, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> • cq`IFORP • Program Manager Telephone: (209)468-3420 Douglas W. Wilson, R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209)464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ .Teff Carruesco, R.E.H.S. <br /> DENIS L. BROWN OCT 1 I 2005 <br /> SHELL OIL PRODUCTS US <br /> HSE — ENVIRONMENTAL SERVICES <br /> 20945 SOUTH WILMINGTON AVENUE <br /> CARSON CA 90810-1039 <br /> RE: Interstate Shell SITE CODE: 1058124 <br /> 620 West Charter Way <br /> Stockton, California 95206 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Subsurface <br /> Investigation Work Plan, dated August 31, 2005, prepared and submitted by Cambria <br /> Environmental Technology, Inc. (Cambria) on your behalf for the above-referenced site. <br /> In this work plan, Cambria proposes the advancement of seven cone penetration test (CPT) <br /> borings (CPT-12 through CPT-18) and twinned direct-push borings to assess soil lithology <br /> and stratigraphy and collect soil and groundwater samples for chemical analysis. <br /> EHD approves the advancement of the proposed seven CPT and twinned direct-push <br /> borings as follows: <br /> • CPT-12 will be advanced in the sidewalk adjacent to the Best Western Motel on <br /> West Charter Way and CPT-13 will be advanced in the parking lot on the east side <br /> of the Best Western Motel to assess the lateral extent of petroleum hydrocarbon and <br /> methyl tertiary-butyl ether (MTBE) contamination in groundwater. Both borings <br /> will be advanced to a total depth of approximately 100 feet below surface grade <br /> (bsg) and groundwater samples will be collected at approximately 50, 65, 70, 75, <br /> and 90 feet bsg at twinned borings adjacent to CPT-12 and CPT-13. No soil <br /> samples will be collected. <br /> • CPT-14, CPT-15, and CPT-16 will be advanced to approximately 40 feet bsg <br /> approximately 25 feet west, northeast, and east of the existing underground storage <br /> tanks (UST), respectively, to assess soil and groundwater contamination in the <br /> shallow subsurface. Soil samples will be collected at twinned borings adjacent to <br /> CPT-14 and CPT-15 at approximately 20, 30, and 40 feet bsg, and at least one grab <br /> groundwater sample will be collected from the three twinned borings at depths <br /> between 20 and 40 feet. No soil samples will be collected at CPT-16. <br />