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08/22/2080 16 18 2094671118 ACE STOCKTON PAGE 03/07 <br /> i • <br /> Ground Water Extraction Pilot Test <br /> Curtiss Pontiac Buick <br /> 2450 Toste Road, Tracy,California <br /> 1.0. INTRODUCTION <br /> At your request, Advanced GeoEnvixorimental, Inc has prepared the enclosed Work Plan for <br /> perfonxiance of a ground water extraction test at 2450 Toste Road in Tracy, California(the site) The <br /> location of the site is illustrated in Figure 1 A,plan of the site is illustrated on Figure 2 <br /> The enclosed work plata for remedial feasibility testing was prepared as required by the Public Health <br /> Services - Environmental Health Division (PHS-EHD) letter dated 12 July 2000 This Work flan <br /> is prepared in accordance with Central Valley Regional Water Quality Control Board (RWQCB) <br /> guidelines for the investigation of underground storage tanks (UST) Sites <br /> The purpose of this Work Plan is to evaluate feasibility and effectiveness of ground water extraction <br /> for remediation of hydrocarbon-impacted ground water at the site <br /> 2.0. BACKGROUND <br /> The following are milestone events in the soil and ground water investigation at the site <br /> • On 31 July 1991 three USTs, dispensers and piping were removed from the site, <br /> • On 24 June 1997, rune soil probe borings (B 1 through B9) were advanced at the site, <br /> • On 12 and 13 February 1998 five ground water morutoring wells were installed, <br /> • On 04 November 1999, six soil probe borings (PB1 through PB6)were advanced at the site, <br /> • On 18 and 19 November 1999 two ground water monitoring wells were installed on-site <br /> • Quarterly ground water sampling and reporting has been ongoing since February 1998 <br /> The approximate extent of impacted soil and ground water has been defined by the installation of <br /> soil borings and the current monitoring well network The vertical extent of dissolved hydrocarbons <br /> in the former UST area may required additional assessment or monitoring <br /> A, silt layer underlies the site at a depth of approximately 8 feet bsg, which is under lana by a salad <br /> silty sand depths between 10 to 15 feet bsg Ground water currently occurs at a depth of <br /> approximately 8 feet bsg <br /> Site background was summarized in the Initial Work Plan dated 15 January 1998,Revised Quarterly <br /> Report - March 1998, dated 18 September 1998, Quarterly Report - December 1999, dated 1.4 <br /> February 2-000, prepared by AGE <br /> i <br /> .Advanced GeoEnmonmental,Inc <br />