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Bank of Stockton - Cutter Lumber Site Page 5 <br /> Spring Quarter Groundwater Monitoring Report <br />' Project No 102 2 <br /> July 13, 1998 <br />' contaminated wells (MW-6, 7 & 8B) were about 30-50% lower than those <br /> measured during the initial sample collection in March of this year No diesel <br />' range petroleum hydrocarbons were detected in MW-6, 7 8A or 8B Low to non- <br /> detectable levels of gasoline and volatile organic range hydrocarbons were <br /> measured in samples from the three down gradient wells not adjacent to the <br />' release site The sample collected from MW-10, the most directly down gradient <br /> of the three wells, contained only 1 ppm total xylenes and 0 4 ethyl benzene and <br /> non-detectable levels of TPH-Gasoline range hydrocarbons <br />' 2.3 Field Data <br />' The field data for this groundwater monitoring event are summarized in <br /> Appendix B and Table 2 The level of groundwater has risen about two feet <br /> since the groundwater monitoring event completed in March of this year <br />' Groundwater gradient calculations for MW-6, 10 & 11 yield the following <br /> gradients and directions <br />' Table: Groundwater Gradient <br /> Date Gradient, Direction/Slope <br /> l <br /> ie March 13, 1998 N650E, 0 0004ft/ft <br /> April 17, 1998 N71-E, 0 0008ft/ft <br /> May 15, 1998 N62-E, 0 0014ft/ft <br />' June 16, 1998 N59-E, 0 0021ft/ft <br /> The groundwater in the area of MW-7, directly beneath the location of the <br />' former gasoline UST, while severely impacted by gasoline range hydrocarbons <br /> did not have measurable free phase product floating on the surface of the <br /> groundwater <br /> I <br /> I <br /> 1 <br /> • <br /> I2937 Veneman Ave,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br /> I <br />