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Bank of Stockton- Cutter Lumber Site Page 4 <br /> Spring Quarter Groundwater Monitoring Report <br /> I Project No 102 2 <br /> July 13, 1998 <br /> I changed between the collection of each sample to reduce the potential for cross- <br /> contamination <br /> Extreme care was exercised while collecting samples to prevent agitation of the <br /> water contained in the bailer Water samples were transferred from the bailer <br /> into 40 ml VOA vials preserved with hydrochloric acid and 1 liter capacity amber <br /> Iglass bottles (provided by the analytical laboratory) All samples were checked <br /> for head space bubbles, labeled, inserted into foam holders and placed in an ice <br /> chest cooled to 4°C for transport to the laboratory <br /> The two pre-existing, groundwater monitoring wells, MW-1 and MW-4 were not <br /> monitored and sampled during this event, however, depth to groundwater was <br /> measured in each of them <br /> I A total of 2 drums of gasoline contaminated purge & rinseate water were <br /> generated during the activities described above American Valley <br /> Environmental will remove this material during the next scheduled depth to <br /> Iwater measuring event in July. <br /> lie 2.2 Groundwater Sample Analyses <br /> Groundwater samples were analyzed as follows <br /> MW-1 & 4 <br /> These wells were not sampled during this round <br />' MW-6, 7, 8A & 8B <br /> Benzene, Toluene, Ethyl Benzene, and Total Xylenes by EPA method 602 <br />' abbreviated <br /> • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015(m) <br /> • Total Extractable Petroleum Hydrocarbons as Diesel (TEPH as Diesel) by <br />' EPA method 351018015(m) <br /> MW-9, MW-10 and MW-11 <br />' • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015(m) <br /> Total Extractable Petroleum Hydrocarbons as Diesel (TEPH as Diesel) by <br />' EPA method 351018015(m) <br /> The detection limits are included in the summary analytical data table (Table 1) <br />' The data presented in Table 1 show that the hydrocarbon levels in the samples <br /> collected during this round were lower than the levels in the groundwater <br /> samples from the initial round Benzene levels in samples from the most <br />' 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc Phone (209)569-0293 <br /> Modesto, CA 95356 Fax (209)569-0293 <br /> 1 <br />