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t umber Site Pa <br /> Bank of Stockton - Cut Cutter L e 4 g <br /> Quarterly Groundwater Monitoring Report <br /> Project No. 102.2 <br /> . September 14, 2004 <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 /> I ' 5030/8015(m). <br /> • Benzene Toluene, Ethylbenzene and total Xylene (BTEX) and MTBE by EPA <br /> method 602 <br /> 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 5 of 6 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 fallen about 3 feet since <br /> the groundwater monitoring event completed on June 7, 2004. The bearing and <br /> ' gradient of groundwater flow was calculated using a 3-paint solution for wells <br /> MW-6, 10 & 11. The historical calculations of gradients and directions are <br /> summarized in the following table: <br /> Table: Groundwater Gradient, 2003 & 2004 <br /> Date Gradient; Direction/Slope <br /> ' March 24, 2003 N480E, 0.0040 ft/ft <br /> July 17, 2003 N80W, 0.0037 ft/ft <br /> September 22, 2003 N4611E, 0.0044 ft/ft <br /> December 12, 2003 N50°E2 0.0036 ft/ft <br /> March 16, 2003 N37-E, 0.0047 ft/ft <br /> June 7, 2004 N480E, 0.0042 Mt. <br /> September 1, 2004 N60-E, 0.0052 ft/ft <br /> Calculation based on MW-7, 813 and 11. <br /> 1 <br /> 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax(209) 569-0293 <br /> 1 <br />