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507A Environmental Technology Inc _ December 30, 1994 ' Mr Michael Infurna Senior REHS, Site Mitigation Unit Environmental Health Division RECEIVED ' Public Health Services JAN f G 1995 San Joaquin County 445 N San Joaquin Street ENVIRONMENTAL HEALTH Stockton, CA 95201-0388 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 Quarterly Groundwater Monitoring Report for your review This report ,documents the groundwater sampling program that was conducted on t December, 1994 at the subject site Figure 1 is the site plot plan showing the o the wells SOTA's geologist measured the depth to groundwater at all six monitoring wells, MW-1, MW-2, MW-3, MW-4, MW-5, and MW-6 on December 2 and 3, 1994 ' 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 in advance to San Joaquin county Environmental Health Division on November 22, 1994 SOTA's geologist attempted to contact Mr Mich41 Infurna of San Joaquin County-Environmental Health Division on Decembeij, X994, but could not be reached The sampling program was conducted as described below A minimum of 4 well volumes, which was calculated to be 12 gallons, was purged from each of the 1 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 1 stabilized within at least 5% of previous readings MW-1, MW-2, MW-3, MW-4, MW-5, and MW-6 were purged of 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 soap water, followed by two rounds of 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/di posaL—Aas allowed for recovery after purging All monitoring wells were allowed to recover to 80 percent or more of their static water level condition At the time of groundwater sampling, neither free 1