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' Bank of Stockton -Cutter Lumber Site Page 4 <br /> Quarterly Groundwater Monitoring Report <br />' Project No 102 2 <br /> . August 1,2003 <br />' <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 /> Environmental will remove this material prior to the next scheduled depth to <br /> water 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 /> 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 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 less than one foot <br /> since the groundwater monitoring event completed on March 24 of 2003 <br /> Normally, the bearing and gradient of groundwater flow is calculated using a 3- <br /> point solution for wells MW-6, 10 & 11 At the time of this current event, the <br /> recent pilot vapor extraction and sparge test was in the process of being <br /> completed As a result of these activities, the groundwater level in MW-6 was 3 <br />' feet shallower than normal and not representatives of normal conditions For <br /> this reason the MW-6 water level was not included in the groundwater gradient <br /> map (Figure 3), or in the 3-point solution Instead a 3-point solution based on <br /> MW-7, 8B and 11 was used The historical calculations of gradients and <br /> directions ate summarized in the following table <br /> I Table: Groundwater Gradient, 2001, 2002 & 2003 <br /> Date Gradient, Direction/Slope <br /> March 12, 2001 N490E, 0 0016 ft/ft <br /> June 7, 2001 N390E, 0 0035 ft/ft <br />' September 18, 2001 N48-E, 0 0042 ft/ft <br /> December 5, 2001 N680E, 0 0015 ft/ft <br /> March 20, 2002 N66-E, 0 0028 ft/ft <br />' June 17, 2002 N49-E, 0 0033 ft/ft <br /> September 12, 2002 N62-E, 0 0041 ft/ft <br /> December 20, 2002 N420E, 0 0030 ft/ft <br /> March 24, 2003 N48-E, 0 0040 ft/ft <br /> July 17, 2003 N80W, 0 0037 ft/ft <br /> 2937 veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br /> I <br />