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Bank of Stockton Cutter Lumber Site Page 4 <br /> Quarterly Groundwater Monitoring Report <br /> Ile Project No 102 2 <br /> November 12,2002 <br /> I <br /> the analytical laboratory) All samples were checked for head space bubbles, <br /> labeled, inserted into foam holders and placed in an ice chest cooled to 4'C for <br /> transport to the laboratory <br /> 1 Gasoline contaminated purge & rinseate waterurin enerated dthe activities <br /> g g <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) by EPA method 602 <br />' The detection hmxts 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 about three feet <br />' since the groundwater monitoring event completed on June 17 of 2002 The <br /> bearing of the groundwater flow has remained generally consistent <br />' Groundwater gradient calculations for MW-6, 10 & 11 yield the following <br /> gradients and directions <br /> Table: Groundwater Gradient, 2000, 2001 & 2002 <br />' Date Gradient, Direction/Slope <br /> January 20, 2000 N40-E, 0 0021 ft/ft <br /> April 25, 2000 N53-E, 0 0018 ft/ft <br />' July 19, 2000 N49-E, 0 0044 ft/ft <br /> December 5, 2000 N56-E, 0 0023 ft/ft <br /> March 12, 2001 N4911E, 0 0016 ft/ft <br />' June 7, 2001 N39-E, 0 0035 ft/ft <br /> September 18, 2001 N48-E, 0 0042 ft/ft <br /> December 5, 2001 N68-E, 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 />' 2937 Veneman Ave,#11240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br /> I <br />