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GEOTHASE <br /> ENVIRONMENTAL <br /> Report <br /> Groundwater Monitoring Well Abandonment <br /> Former Karlson Trucking Property <br /> 9909 East Woodward Avenue <br /> Manteca, CA 95366 <br /> August 6, 2002 <br /> Project No. 191.2 <br /> 1.0 INTRODUCTION <br /> This report documents the final abandonment (destruction) of 6 former <br /> groundwater monitoring wells located on the Property. This work was <br /> completed on August 1, 2002. <br /> 1.1 Site History <br /> In 1998, Geo-Phase Environmental, Inc. determined that a release of <br /> petroleum hydrocarbons had impacted the soil and groundwater under the <br /> Property. Subsequently the California Regional Water Quality Control <br /> Board was notified of the release, and they directed that additional work be <br /> completed to investigate the extent of the contamination. To accomplish this, <br /> a number of soil borings were installed and a total of 7 groundwater <br /> monitoring wells were constructed, and several rounds of groundwater <br /> monitoring and sampling were completed. One of these wells (MW-5) was <br /> later destroyed, as it was no longer needed. The results of the investigation <br /> showed that the source of the release was a battery of former aboveground <br /> diesel storage tanks located between the shop and the pole barn. The lateral <br /> and vertical extent of the groundwater diesel plume was limited to a narrow <br /> band on the Property, and did not extend deeper than about 32 feet below <br /> grade. <br /> 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto, Ca 95356 Fax: (209) 569-0295 <br />