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Bank of Stockton-Cutter Lumber Site Page 4 Quarterly Groundwater Monitoring Report Protect No t022 January 24,2001 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 2.2 Groundwater Sample Analyses Groundwater were samples p e e analyzed as follows • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(m) • Benzene Toluene, Ethylbenzene and total Xylene (BTEX) by EPA method 602 The detection limits are included in the summary analytical data table(Table 2) ' Detectable levels of gasoline range petroleum hydrocarbons and/or BTEX compounds were found in water samples from all but one of the wells that 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 about 1 Meet since the groundwater monitoring event completed in July of 2000 The bearing of the groundwater flow has remained generally consistent Groundwater gradient calculations for MW-6, 10 & 11 yield the following gradients and directions ' Table: Groundwater Gradient, 1999 & 2000 ' Date Gradient, Direction/Slope January 19, 1999 N43-E, 0 0024 ft/ft March 2, 1999 N54-E,0 0017 ft/ft March 24, 1999 N45-E,0 0023 ft/ft ' July 7, 1999 N40-E,0 0038 ft/ft October 10, 1999 N48-E, 0 0046 ft/ft January 20,2000 N40-E,0 0021 ft/ft I April 25, 2000 N53-E,0 0018 ft/ft July 19,2000 N49-E,0 0044 ft/ft December 5,2000 N56-E,0 0023 ft/ft 2.4 Waste Disposal tPurge water temporarily stored in drums will be collected by American Valley Waste 011, a licensed hazardous waste hauler, for recycling prior to the next monitoring event • 2937 Veneman Ave,NB240 Geo-Phase Environmental Inc. Phone(209)569-0293 Modesto,CA 95356 Fax(209)569-0293