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Bank of Stockton Cutter Lumber Site <br /> Page 7 <br /> Spring Quarter Groundwater Monitoring Report <br />' Project No 102 2 <br /> July 13, 1998 <br />' of 80 feet or more Since the conductor casing in this well extends to a depth of <br /> 49 feet, while detectable contamination exists in the soil to depths of at least 55 <br />' feet it was previously postulated that the drilling equipment may have carried <br /> low levels of hydrocarbon contamination to these deeper zone and cross- <br /> contaminated it This current sampling event makes the possibility appear less <br /> likely <br /> No diesel range petroleum hydrocarbons were detected in any of the <br /> t groundwater samples It now seems clear that diesel range hydrocarbons which <br /> were apparently released in the vicinity of the former "oil supply" building have <br /> not had any substantial impact to the groundwater <br />' 3.2 Future Work Schedule <br />' Based on the data collected during the course of this investigation, Geo-Phase <br /> Environmental Inc anticipates the following work be completed in the future <br />' Quarterly groundwater monitoring and sampling should continue The depth to <br /> groundwater should be checked monthly for at least the next two quarters Only <br />' after monitoring has been performed several times will it be possible to <br /> intelligently consider the possibilities for future action It is possible that two to <br /> three additional monitoring wells will be needed to adequately characterize this <br />' release <br /> The existing well purge water will be disposed of during the next depth to water <br /> measuring event <br /> I <br /> I <br /> 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br />