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SOFA ,(* _ Enwonmental Technology Inc September 6, 1995 Mr Michael Infurna. Senior REHS, Site Mitigation Unit Environmental Health Division ' Public Health Services San Joaquin County nw �ti 445 N San Joaquin Street Stockton, CA 95201-0388 RE: U-HAUL CENTER # 709-50 ' 2701 N. WILSON WAY, STOCKTON, CALIFORNIA SOTA'S PROJECT NO. 94HW021 ' Dear Mr Infurna ' OTA Environmental Technology, Inc (SOTA) is pleased to submit the following third Quarterly (1995) Groundwater Monitoring Report for your review This report documents the groundwater sampling program that was conducted on August 14 and 15.L1995 t the subject site by SOTA's scientist The site oca on map is presented in Figure 1 Figure 2, shows the location of wells, the groundwater elevations, the groundwater contours and flow direction for August 14, 1995 Groundwater concentrations of Total Petroleum Hydrocarbons- gasoline standard (TPH-g) for the samples collected on 8/14/95 and 8/15/95, are provided in Figure 3 SOTA's personnel measured the depth to groundwater at all six monitoring wells, MW-1, MW-2, MW-3, MW-4, MW-5, and MW-6 on August 14, 1995 The depth to the water level and the corresponding surface elevations, with respect to mean sea level, are presented in Table 1 Mr Michael Infurna, San Joaquin ' County Environmental Health Division was informed of SOTA's quarterly ground water sampling schedule at the site ' The sampling program was conducted as described below A minimum of 3 well volumes, which was calculated with regard to groundwater depth and total well depth was purged from each of the six wells During purging operations the temperature, pH, and conductivity were measured with a Hydac water quality ' meter The pumping was carried on until the temperature, pH, and conductivity values stabilized within at least 5% of previous readings MW-1, MW-2, MW-3, MW-4, MW-5, and MW-6 were purged using a 2-inch submersible ' pump Copies of the field observation which includes temperature, pH, and conductivity values, are enclosed in Appendix-A Proper decontamination procedures which included flushing the pump and hose with a solution of ' Alconox and water, followed by clean tap water, with a final rinse using deionized water were employed The purged water is stored in 55-gallon DOT approved drums which have been labeled and stored on-site for subsequent treatment/disposal Adequate time was allowed for recovery after purging