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i � Bank of Stockton- Cutter Lumber Site Page 4 Quarterly Groundwater Monitoring Report Project No. 102.2 February 6,2004 I labeled, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory. Gasoline contaminated purge & rinseate water generated during the activities described above was stored in poly drums located on the site. American Valley Waste Oil 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 (TPH-G) by EPA method 5030/8015(m). Benzene Toluene, Ethylbenzene and total Xylene (BTEX) and MTBE 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 1 compounds were found in 5 of 6 water samples that were collected. 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 risen very slightly since the groundwater monitoring event completed on September 22, 2003. The ' bearing and gradient of groundwater flow was calculated using a 3-point solution for wells MW-6, 10 & 11. The historical calculations of gradients and directions ate summarized in the following table: 1 Table: Groundwater Gradient, 2002 & 2003 Date Gradient, Direction/Slope ' March 20, 2002 N66-E, 0.0028 ft/ft June 17, 2002 N490E, 0.0033 ft/ft September 1.2, 2002 N620E, 0.0041 ft/ft ' December 20, 2002 N4211E, 0.0030 £t/ft March 24, 2003 N48-E, 0.0040 ft/ft July 17, 2003 N80W, 0.0037 ft/ft 1 September 22, 2003 N460E, 0.0044 ft/ft December 12, 2003 N500E, 0.0036 ft/ft ' * Calculation based on MW-7, SB and 11. 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 Modesto, CA 11111 Fax (209) 569-0293