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111 �5 <br />T11A V, <br />1995 FOURTH QUARTER <br />GROUNDWATER MONITORING REPORT <br />7759 S. AIRPORT WAY <br />STOCKTON, CALIFORNIA <br />1.0 INTRODUCTION <br />On 6 December 1995, Roy F Weston, Inc. (WESTON(p) completed the fourth 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 />was to monitor petroleum hydrocarbons in groundwater beneath the location of two former <br />underground storage tanks (UST's) The UST's were removed in 1987 and were used to store <br />weed oil <br />2.0 FIELD SAMPLING SUMMARY <br />Three monitor wells are located at the facility as shown in 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, temperature, pH, and <br />electrical conductivity were measured 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 Appendix A <br />L WROJECr="JOQITMAD4M QTR 1 12 J.w.+y 19% <br />