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' Bank of Stockton - Cutter Lumber Site Page 4 Quarterly Groundwater Monitoring Report Project No 102 2 May 5, 2004 ' 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 ' 503018015(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 ' 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 about 3 feet since the groundwater monitoring event completed on December 12, 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 ' Table: Groundwater Gradient 2003 & 2004 Date Gradient, Direction/Slope ' March 24, 2003 N480E, 0 0040 ft/ft July 17, 2003 N8°W, 0 0037 ft/ft September 22, 2003 N46-E, 0 0044 ft/ft December 12, 2003 N50-E, 0 0036 ft/ft March 16, 2003 N37-E, 0 0047 ft/ft ' Calculation based on MW-7, 813 and 11 1 1 ' 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293 1