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2 <br /> Teolo ical rechlaa Inc. <br /> 1101 7h Street .p <br /> Modesto,Califomia 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> a Report <br /> � n <br /> Revised Site Conceptual Model <br /> J.M. Equipment Company <br /> 3245 West Charter way <br /> Stockton, California <br /> �E <br /> Project No. 507.2 <br /> April 3, 2008 <br /> 1..0 INTRODUCTION <br /> J.M. Equipment Company received'a letter on November 1, 1996 from Mr. Joel Weiss of the <br /> California Regional Water <br /> gi Quality Control Board - Central Valley Region. The letter <br /> referenced a report prepared by William J. Hunter & Associates for Independent Trucking <br /> Facility located east of J. M. Equipment at 1145 West Charter Way, Stockton, CA. This <br /> report "Interim Report Covering Soil and Groundwater Investigation" dated October 21, <br /> 1996, included information from MW-9, a groundwater monitoring well placed on J. M. <br /> Equipment property for the purposes of defining the groundwater plume in an up gradient <br /> direction—see Figures 1 &2. <br /> Historical research was performed to determine possible sources of the gasoline range <br /> petroleum hydrocarbons found in MW-9. It was discovered that years ago this subject <br /> facility contained two underground storage tanks (UST's) and two aboveground fuel storage <br /> tanks (AST's)., These tanks contained both gasoline and diesel. The preliminary data from <br /> MW-9 suggested that only the gasoline tanks released fuel. <br /> Facility photographs document that these tanks were located near the southeast corner of the <br /> Hesston Shop. County assessor records show that this shop was constructed in 1988 and to <br /> the best of facility employees' recollection the UST's were removed in the early 1980's. For <br /> a period of several years J.M. Equipment used just AST's. The UST's were in the size range <br /> of 500 to 1,000 gallons and the AST's appeared to be less then 500 gallons each. <br /> . x <br />