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q3 - '5e5- <br /> ERM-West Inc <br /> AL 2001 "P"Street <br /> 12 July 1993 i Off �w � HEALTH Suite 200 <br /> pti J c Vi uF Sacramento,CA 95814 <br /> (916)444-9378 <br /> 93 JUL QM 2' 01 (916)444-5313(Fax) <br /> Mr Harlin Knoll <br /> Environmental Health Specialist <br /> Public Health Services <br /> San Joaquin County <br /> P O Box 2009 <br /> 1601 E Hazelton Avenue <br /> Stockton, CA 95201 <br /> Subject Results of May 19, 1993 Sampling of Groundwater <br /> from Monitoring Wells at the Site Located at <br /> 1033 East Scotts Avenue, Stockton, California n We <br /> Dear Mr Knoll ERM <br /> Well SFW-1, SFW-2, and SFW-3 were sampled on May 19, 1993 <br /> for diesel and oil and grease in accordance with your request <br /> in your letter dated March 11, 1993 (see Attachment 1) Table 1 <br /> summarizes groundwater elevations measured prior to well purging and <br /> sampling The groundwater flow direction has changed from south- <br /> southwest, as measured in March 1993, to northeast (Figure 1) These changes <br /> to groundwater flow direction may be due to the above-average rainfall we <br /> have had this year, which may have temporarily altered groundwater <br /> pumping patterns in the area <br /> Table 1 <br /> May 1993 Groundwater Elevations <br /> Well # Casing Elevation GW Elevation <br /> SFW-1 +23 89 ft -35 13 ft <br /> SFW-2 +20 70 ft -35 70 ft <br /> SFW-3 +18 13 ft -35 75 ft <br /> Teflon bailers were used to purge the wells prior to sampling The bailers <br /> were decontaminated prior to purging each well by washing with an Alconox <br /> solution and triple rinsing with deionxzed water Each monitoring well was <br /> developed by bailing until three consecutive conductivity, pH, and <br /> temperature measurements varied by less than 10% Table 2 summarizes the <br /> number of well volumes removed from each well prior to sampling, and the <br /> stable pH, temperature, and conductivity measurements <br /> A MEMBER OF THE ENVIRONMENTAL RESOURCES MANAGEMENT GROUP <br />