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P <br /> � kn KLEINFELDER <br /> File No. 20-1008-52.A01 <br /> May 16, 1994 <br /> PROPOSAL/WORKPLAN <br /> SITE ASSESSMENT <br /> DIESEL UNDERGROUND STORAGE TANKS <br /> 444 SOUTH WILSON WAY <br /> SAN JOAQUIN COUNTY MOTOR POOL <br /> STOCKTON, CALIFORNIA <br /> INTRODUCTION <br /> Kleinfelder is pleased to present this proposal to San Joaquin County This proposal was <br /> developed after discussions with Mr. Gabriel E. Karam, using Kleinfelder's current <br /> understanding of the site conditions, and is a preliminary understanding of the San Joaquin <br /> County Environmental Health Division's desires and requirements. We prepared this proposal <br /> based on information usually requested in a workplan by the San Joaquin County Public Health <br /> Services, Environmental Health Division (SJCEHD). <br /> Kleinfelder is committed to providing a high level of service to its clients, commensurate with <br /> their wants and needs. If a portion of this proposal does not meet the needs of the client, or if <br /> those needs have changed, Kleinfelder stands ready to consider appropriate modifications, <br /> subject to the standards of care to which we adhere as professionals. Modifications such as <br /> changes in scope, methodology, scheduling, and contract terms and conditions may result in <br /> changes to the risks assumed by the client, as well as adjustments to our fees. We look forward <br /> to the opportunity to serve you. <br /> BACKGROUND <br /> The site is located at 444 South Wilson Way in Stockton, California. Two underground diesel <br /> storage tanks and the associated dispensers were excavated and removed from the site on <br /> November 5, 1993. Analysis of a soil sample obtained from 3 feet beneath the former <br /> dispenser location revealed concentrations of 0.01 mg/kg ethylbenzene, 0.011 mg/kg toluene, <br /> 0.075 mg/kg total xylenes, and 3,200 mg/kg Total Petroleum Hydrocarbons as referenced to <br /> Diesel (TPH-D). <br /> In a March 3, 1994 letter, Mr. Doug Wilson of the SJCEHD indicated that the County will not <br /> recommend "final closure without further investigation to determine the full extent of the soil <br /> and/or groundwater problem." Currently, groundwater is approximately 70 to 80 feet below <br /> the ground surface, as indicated on the Fall 1993 Groundwater Depth Map published by the <br /> San Joaquin County Flood Control and Water Conservation District. <br /> At the request of San Joaquin County Environmental Health Division (SJCEHD), additional <br /> soil was removed from beneath the former dispenser on April 26, 1994. At that time a soil <br /> sample was obtained from the bottom of the excavation at a depth of 10 feet below ground <br /> ETH:md 1E/94 <br /> Copyright 1994 Kleinfelder, Inc. Page 1 of 5 <br />