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Bank of Stockton-Cutter Lumber Site Page 4 <br /> Quarterly Groundwater Monitoring Report <br /> Project No. 102.2 <br /> May 8,2006 <br /> ' labeled, inserted into foam holders and placed in an ice chest cooled to 4°C for <br /> transport to the laboratory. <br /> Gasoline contaminated purge & rinseate water generated during the activities <br /> described above was stored in poly drums located on the site. American Valley <br /> Waste Oil will remove this material prior to the next scheduled depth to water <br /> measuring event. <br /> ' 2.2 Groundwater Sample Analyses <br /> Groundwater samples were analyzed as follows: <br /> • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method <br /> ' 5030/8015(m). <br /> Benzene Toluene, Ethylbenzene and total Xylene (BTEX) and MTBE by EPA <br /> method 602 <br /> III ' The detection limits are included in the summary analytical data table(Table 2). <br /> Detectable levels of gasoline range petroleum hydrocarbons and/or BTEX <br /> ' compounds were found in 4 of the 5 water samples that were collected. <br /> 2.3 Field Data <br /> ' The field data for this groundwater monitoring event are summarized in <br /> Appendix B and Table 1. The level of groundwater has risen as much as 4 feet <br /> since the groundwater monitoring event completed on December 14, 2005. The <br /> ' bearing and gradient of groundwater flow was calculated based on a 3-point <br /> solution for wells MW-6, 10 & 11. The historical calculations of gradients and <br /> directions are summarized in the following table: <br /> Table: Groundwater Gradient Since 2004 <br /> Date Gradient; Direction/Slope <br /> ' March 16, 2004 N37-E, 0.0047 ft/ft <br /> June 7, 2004 N48-E, 0.0042 ft/ft <br /> September 1, 2004 N60°E, 0.0052 ft/ft <br /> December 23, 2004 N23-E, 0.0034 ft/ft <br /> March 17, 2005 N391E, 0.0047 ft/ft <br /> June 14, 2005 N760E, 0.0111 ft/ft <br /> ' September 19, 2005 N470E, 0.0046 ft/ft <br /> December 14, 2005 N42-E, 0.0039 ft/ft <br /> March 20, 2006 N52-E, 0.0034 ft/ft <br /> ' 2.4 Waste Disposal <br /> Purge water from this monitoring event was temporarily stored in 55-gallon <br /> drums on the site- The waste water will be removed for recycling prior to the <br /> next monitoring event. American Valley Waste Oil removed water from the <br /> I ' 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br />