Laserfiche WebLink
10 INTRODUCTION <br /> ' On behalf of the San •°_ ._�.. <br /> Joaquin County Facilities Management Department, Ramage Environmental <br /> has prepared this Additional Site Investigation Report for submittal to San Joaquin County <br /> Environmental Health Division (EHD) and to the Central Valley Regional Water Quality Control <br /> Board (RWQCB) This report also includes the groundwater monitoring results for the First <br /> ' Quarter 2004 <br /> ' The site investigation scope of work was completed according to Ramage Environmental's Work <br /> t Plan, Additional Site Investigation, dated March 12, 2004 EHD approved the work plan with <br /> conditions on March 18, 2004 A copy of the work plan approval letter is included in Appendix A <br /> ' 1 1 Site Location and Description <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 /> 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 building (Figure 2) - <br /> 1.2 Previous Work <br /> 1 2 1Initial Sod Borings <br /> In May 1994, Kleinfelder drilled two sod borings (designated B-1 and B-2) at the south ends of <br /> ' each UST(Figure 2) Kleinfelder documented the results of the investigation in Environmental <br /> and Geotechnical Assessment Report and Tank Removal Plan, dated August 26, 1994 <br /> Both soil borings were drilled to total depths of approximately 25 feet below ground surface (b s <br /> ) <br /> ' Based on field screening with a photoionization detector(PID), only the sod sample with the <br /> highest organic vapor concentration from each boring was submitted for laboratory analysis The <br /> sod 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 /> xylenes The soil sample collected at 18 feet from B-2 contained 250 mg/kg of TPH-as-gasoline, <br /> ' 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 The soil sample analytical results are summarized in Table 1 <br /> 5 <br /> i <br /> 1 <br /> 1 <br />