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*N' March 30, 1995 Environmental Technology Inc ' Mr Michaellnfurna Senior REHS, Site Mitigation Unit Environmental Health Division Public Health Services San Joaquin County 6;CEIVED 445 N San Joaquin Street APR 0 3 ins ' Stockton, CA 95201-0388 ENVIRONMENTAL HEALTH PERMIT/SERVICES RE: U-HAUL CENTER # 709-50 2701 N. WILSON WAY, STOCKTON, CALIFORNIA SOTA'S PROJECT NO. 94HWO21 ' Dear Mr Infurna ' SOTA Environmental Technology, Inc (SOTA) is pleased to submit the following (revised) Quarterly Groundwater Monitoring Report for your review This report documents the groundwater sampling program that was conducted on February 21 and 22, 1995 at the subject site The site location map is presented in Figure 1 Figure 2, shows the location of well, the groundwater elevations, the groundwater contours and flow direction for February 21, 1995 Groundwater concentrations of Total Petroleum Hydrocarbons-gasoline standard (TPH-g) are ' provided in Figure 3 SOTA's geologist measured the depth to groundwater at all six monitoring wells, ' MW-1, -2, -3, -4, -5, and -6, on February 21, 1995 The depth to the water level and the corresponding surface elevations, with respect to mean sea level, are presented in Table 1 SOTA's geologist informed San Joaquin County ' Environmental Health Division of the proposed sampling event, in advance, on February 15, 1995 The sampling program was conducted as described below A minimum of 4 well ' volumes, which was calculated to be approximately 16 gallons, was purged from each of the six wells During purging operations the temperature, pH, and conductivity were measured with the water flowing through a continuous flow ' chamber 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 of approximately 25 gallons of water per well 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 detergent 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 All monitoring wells were allowed to recover to 95 percent or more of their static water level condition At the time of ' 16980 Via Tazon Suite 130 430 Foothill Blvd Suite B San Diego CA 92127 1633 La Canada CA 91 o11 619 485 8100 FAX 619 485 0812 818 952 8124 818 790 2080