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IBank of Stockton- Cutter Lumber Site Page 4 Quarterly Groundwater Monitoring Report Project No 102 2 August 15,2000 into 40 ml VOA vials preserved with hydrochloric acid (provided by the analytical laboratory) All samples were checked for head space bubbles, labeled, inserted into foam holders and placed in an ice chest cooled to 40C for transport ' to the laboratory After collection, the groundwater samples were temporarily stored in Del-Tech's Irefrigerator pending pick-up and transfer by the laboratory courier A mechanical malfunction occurred, and the samples froze, thus breaking the glass ' containers This necessitated re-sampling the wells Del-Tech personnel subsequently re-mobilized to the location and re-sampled the monitoring wells on July 21, 2000 By the direction of the representative from the San Joaquin ' County PHS-EHD, only one casing volume was purged from each well prior to re-collecting each sample Otherwise the purging and sampling techniques were as described above ' Gasoline contaminated purge & rinseate water generated during the activities described above was stored in poly drums located on the site American Valley ' Environmental will remove this material prior to the next scheduled depth to water measuring event Documentation of the disposal of purge water from the last monitoring event is herein attached as Appendix C 2.2 Groundwater Sample Analyses Groundwater samples were analyzed as follows • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method ' 5030/8015(m) • Benzene Toluene, Ethelbenzene and total Xylene (BTEX) by EPA method 602 The detection limits are included in the summary analytical data table ('Fable 2) Detectable levels of gasoline range petroleum hydrocarbons and/or BTEX compounds were found in water samples from all but two of the wells which ' were sampled 2.3 Field Data The field data for this groundwater monitoring event are summarized in ' Appendix B and Table 1 The level of groundwater has fallen almost two feet since the groundwater monitoring event completed in April of this year The bearing of the groundwater flow has remained generally consistent Groundwater gradient calculations for MW-6, 10 & 11 yield the following gradients and directions 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293 1