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l <br /> SOFA ItF <br /> Environmental Technology Inc � ZA <br /> June 12, 1995 <br /> Mr Michael Infurna <br /> Senior REHS, Site Mitigation Unit <br /> Environmental Health Division @ <br /> Public Health Services <br /> San Joaquin County JUN 14 1995 <br /> 445 N San Joaquin Street <br /> Stockton, CA 95201-0388 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> RE: U-HAUL CENTER # 709-50 <br /> 2701 N. WILSON WAY, STOCKTON, CALIFORNIA <br /> SOTA'S PROJECT NO. 94HWO21 <br /> Dear Mr Infurna <br /> /SOTA Environmental Technology, Inc (SOTA) is pleased to submit the following <br /> second Quarterly (1995) Groundwater Monitoring Report for your review This <br /> report documents the groundwater sampling program that was conducted on <br /> 'May 16 and 17 i at the subject site by SOTA's engineer and geologist The <br /> site location map is presented in Figure 1 Figure 2, shows the location of <br /> 401 wells, the groundwater elevations, the groundwater contours and flow direction <br /> for May 16, 1995 Groundwater concentrations of Total Petroleum <br /> Hydrocarbons-gasoline standard (TPH-g) for the samples collected on 5/16/95 <br /> are provided in Figure 3 <br /> SOTA's personnel measured the depth to groundwater at all six monitoring <br /> wells, MW-1, MW-2, MW-3, MW-4, MW-5, and MW-6 on May 16, 1995 The <br /> depth to the water level and the corresponding surface elevations, with respect <br /> to mean sea level, are presented in Table 1 Mr Michael Infurna, San Joaquin <br /> County Environmental Health Division met with SOTA's personnel and <br /> witnessed the purging and sampling for one well <br /> The sampling program was conducted as described below A minimum of 3 well <br /> volumes, which was calculated to be approximately 12 gallons, was purged from <br /> each of the six wells During purging operations the temperature, pH, and <br /> conductivity were measured with the water flowing through a continuous flow <br /> chamber The pumping was carried on until the temperature, pH, and <br /> conductivity values stabilized within at least 5% of previous readings MW-1, <br /> MW-2, MW-3, MW-4, MW-5, and MW-6 were purged of approximately 25 <br /> gallons of water per well using a 2-inch submersible pump Copies of the field <br /> observation which includes temperature, pH, and conductivity values are <br /> enclosed in Appendix-A Proper decontamination procedures which included <br /> flushing the pump and hose with a solution of Alconox and water, followed by <br /> clean tap water, with a final rinse using deionized water were employed. The <br />