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' Bank of Stockton - Cutter Lumber Site Page 4 Autumn Quarter Groundwater Monitoring Report ' Project No 102 2 20 January 1999 ' changed between the collection of each sample to reduce the potential for cross- contamination Extreme care was exercised while collecting samples to prevent agitation of the water contained in the bailer Water samples were transferred from the bailer ' into 40 ml VOA vials preserved with hydrochloric (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 4°C for transport to the ' laboratory A total of 3 drums of gasoline contaminated purge & rinseate water were ' generated during the activities described above American Valley Environmental will remove this material during the next scheduled depth to water measuring event in January 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 Y • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015(m) • Total Extractable Petroleum Hydrocarbons as Diesel (TEPH as Diesel) by ' EPA method 351018015(m) The detection limits are included in the summary analytical data table (Table 1) ' Detectable levels of gasoline range petroleum hydrocarbons and BTEX compounds were found in water samples from wells MW-6, 7, 8A, 813, 9, and 11 ' The sample from MW-10 did not contain detectable gasoline range total petroleum hydrocarbons (TPH-G), and only barely detectable xylene ' 2.3 Field Data The field data for this groundwater monitoring event are summarized in ' Appendix B and Table 2 The level of groundwater has risen about 11/2 feet since the groundwater monitoring event completed in September of 1998 The bearing of the groundwater flow has remained generally consistent however ' Groundwater gradient calculations for MW-6, 10 & 11 yield the following gradients and directions 2937 Veneman Ave ,#13240 Geo-Phase Environmental Inc Phone (209) 569-0293 Modesto, CA 95356 Fax(209) 569-0293 I