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4 , <br /> GENS OESIGNERSCONSULfAMS <br /> 1995 THIRD QUARTER <br /> GROUNDWATER MONITORING REPORT <br /> 7759 S. AIRPORT WAY <br /> STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br />' On 15 September 1995, Roy F Weston, Inc (WFSTON®) completed the third quarter of <br /> groundwater monitoring at the San Joaquin County Mosquito and Vector Control District facility <br />' located at 7759 S. Airport Way in Stockton, California (Figure 1). The purpose of this sampling <br /> event was to monitor for the presence of petroleum hydrocarbons in groundwater beneath the <br /> location of two former underground storage tanks (USTs) The USTs were removed in 1987 <br /> and were used to store weed oil <br /> 2.0 FIELD SAMPLING SUMMARY <br /> Three monitor wells are located at the facility as in shown Figure 2 These wells were <br /> originally installed as part of a groundwater investigation program, which was completed during <br /> August 1994 All three monitor wells were screened in the shallow unconfined aquifer beneath <br /> the site <br /> The groundwater sampling program included measuring the water level depth in each well, <br /> measuring groundwater physical characteristics and collecting groundwater samples for <br />' laboratory analysis Upon arrival at the site, depth to groundwater was measured in each well <br /> relative to a marked survey point During the purge of each well, measurements of temperature, <br /> pH and electrical conductivity were taken after each purged well volume <br />' All three monitor wells on site were sampled after purging a minimum of three well volumes <br /> Groundwater samples were analyzed for total petroleum hydrocarbons as diesel (TPH-D) and <br />' benzene, toluene, ethylbenzene and xylenes (BTEX) A detailed description of the field <br /> activities is presented in the Field Report presented in Appendix A <br /> L TRO1FC1TuAN)OQ\TMA13•7RD QTR 1 20 October 1995 <br />