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1 <br /> FIELD INVESTIGATION REPORT <br /> SAN JOAQUIN COUNTY MOSQUITO AND VECTOR CONTROL DISTRICT <br /> 7759 S. AIRPORT WAY, STOCKTON, CALIFORNIA <br />' July 26 through July 29, 1994, ROY F. WESTON, INC (WESTON®) conducted a site <br /> investigation at the San Joaquin County Mosquito and Vector Control District facility located <br /> at 7759 S Airport Way in Stockton, California The purpose of this investigation was to gather <br />' additional information needed for site closure certification All work was completed in <br /> accordance with the Revised Work Plan dated April 18, 1994 <br />' Two soil borings (SB 1 and SB2) were drilled using a Brainard-Killman BK-81 drilling ng The <br /> borings were advanced to the water table with continuous flight hollow stem augers Soil <br /> samples were collected in brass tubes fitted in a 2-inch diameter California modified split spoon <br />' Samples were screened at every 5-foot interval for the presence of hydrocarbons using a <br /> photoionization detector (PID) All PID readings were 0 0 ppm for SBI and SB2 <br /> i <br />' Five samples from each boring were submitted for analysis of total petroleum hydrocarbons as <br /> diesel (TPH-D) and benzene, toluene, ethylbenzene and xylene (BTEX). The ends of the metal <br /> sleeves containing soil samples selected for analysis were covered with Teflon sheeting and <br />' plastic end caps. Each sleeve was labeled, sealed in a ziplock plastic bag and placed on ice in <br /> a cooler At the conclusion of sampling, each boring was grouted from the bottom to the top <br /> using a 5% bentonite/cement mixture. <br /> Two soil borings (HPI and HP2) were advanced to the water table using a Mobile B-61 drilling <br />' ng with continuous flight hollow stem augers Soil samples were collected in brass tubes at <br /> depths of 8 and 12 feet and submitted for analysis of TPH-G and TPH-D Soil samples were <br /> also collected at 5' intervals and field screened by PID The results of the field screening were <br /> 0 0 ppm for all soil samples from HP 1 and HP2, so the analysis of additional samples was not <br /> warranted <br />' Groundwater samples were collected in borings HP 1 and HP2 using a Hydropunch®groundwater <br /> sampling tool The HydropunchO was pushed 3 to 4 feet into the bottom of the boring, then the <br /> cover was retracted to expose the inlet screen The sample chamber was allowed to fill with <br />' groundwater Water samples were retrieved using a stainless steel bailer and transferred into <br /> laboratory supplied sample containers and scheduled for BTEX and TPH-D analyses The <br /> sample containers were labeled, sealed in individual ziplock bags and placed on ice in a cooler <br />' At the conclusion of sampling, each boring was grouted from the bottom to the top using a 5% <br /> bentonite/cement mixture <br />' Three monitor wells MW-1, MW-2 and MW-3 were installed at locations specified in the field <br /> by Mary Meays of the EHD During the well construction, soil samples were collected at 5 foot <br /> intervals and field screened by a PID instrument The results of the field screening were 0 0 <br /> ppm for all soil samples screened from MW-1, MW-2 and MW-3, so analytical samples were <br /> not submitted from these monitor well borings <br />' nxwvrswcMVCDI SCK <br />