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1 .0 INTRODUCTION <br /> On behalf of the San Joaquin County Facilities Management Department, Ramage Environmental <br /> has prepared this Work Plan, Monitoring Well Installations for submittal to San Joaquin County <br /> Public Health Services Environmental Health Division (PHS/EHD) and to the Central Valley <br /> Regional Water Quality Control Board (RWQCB) . On July 3, 2001 , PHS/EHD requested this work <br /> plan in a meeting with the Facilities Management Department. <br />' 1 . 1 Site Location and Description <br /> i <br /> The subject site is an active single-level parking garage located at 130 N . Hunter Street in <br /> Stockton , California (Figure 1 ) . Two former gasoline underground storage tanks (UST) existed <br /> 1 under the sidewalk, adjacent to the west side of the garage building , and two former gasoline <br /> dispensers on a single island existed approximately 20 feet inside the west wall of the building <br /> (Figure 2) . <br /> " 1 . 2 Previous Work <br /> j 1 . 2 . 1 Initial Soil Borings <br /> In May 1994 , Kleinfelder drilled two soil borings (designated B- 1 and B-2) at the south ends of <br /> each UST (Figure 2) . The results of the investigation were documented in Kleinfelder' s <br /> Environmental and Geotechnical Assessment Report and Tank Removal Plan, dated August 26 , <br /> 1994 . <br /> Both soil borings were drilled to a total depth of approximately 25 feet below ground surface (bgs) . <br /> Based on field screening with a photoionization detector (PID) , only the soil sample with the <br /> highest organic vapor concentration from each boring was submitted for laboratory analysis. The <br /> soil sample collected at 20 feet from B- 1 contained 290 milligrams per kilogram (mg/kg) of Total <br /> Petroleum Hydrocarbons (TPH)-as-gasoline, 4 . 7 mg/kg of ethylbenzene, and 8 . 0 mg/kg of <br /> r <br /> xylenes . The soil sample collected at 18 feet from B-2 contained 250 mg/kg of TPH-as-gasoline , <br /> u 1 . 7 mg/kg of ethylbenzene, and 7. 0 mg/kg of xylenes . The soil samples from the bottom of the <br /> boreholes were not submitted for laboratory analysis. Groundwater was not encountered during <br /> the investigation . These soil sample analytical results are summarized in Table 1 . <br /> 4 <br />