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' Bank of Stockton- Cutter Lumber Site Page 4 Quarterly Groundwater Monitoring Report lieProject No 102 2 December 19, 2001 Extreme care was exercised while collecting samples tc prevent agitation of the water contained in the bailer Water samples were transferred from the bailer ' into 40 ml VOA vials preserved with hydrochloric acid (provided by the analytical laboratory) All samples were checked for he,- d space bubbles, labeled, inserted into foam holders and placed in an ice chest cooled to 4°C for transport ' to the laboratory Gasoline contaminated purge & rznseate 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 samples were analyzed as follows • Total Petroleum Hydrocarbons as Gasoline (TF'H-G) by EPA method ' 5030/8015(m) • Benzene Toluene, Ethylbenzene and total Xylene (B"EX) by EPA method 602 ' The detection limits are included in the summary analytical data table (Table 2) Detectable levels of gasoline range petroleum hyd •ocarbons and/or BTEX ' compounds were found in four (4) of the six (6) water samples that were collected ' 2.3 Field Data The field data for this groundwater monitoring ev 2nt are summarized in ' Appendix B and Table 1 The level of groundwater haE fallen about 3 feet since the groundwater monitoring event completed in June of 2001 The bearing of the groundwater flow has remained generally consister t Groundwater gradient ' calculations for MW-6, 10 & 11 yield the following gradients and directions Table: Groundwater Gradient, 2000 & 2001 Date Gradient, Dire.tion/Slope January 20, 2000 N40°E, 0 0021 ft/ft April 25, 2000 N530E, 0 0018 ft/ft ' July 19, 2000 N49-E, 0 0044 ft/ft December 5, 2000 N56-E, 0 0023 ft/ft March 12, 2001 N49-E, 0 0016 ft/ft I June 7, 2001 N39-E, 0 0035 ft/ft September 18, 2001 N48-E, 0 0042 ft/ft 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293 I