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Additional Site Assessment Work Plan <br /> LOPEZPROPERTY <br /> 1601 Turnpike Road, Stockton,California <br /> 1.0. INTRODUCTION <br /> At the request of Ms. Mabel Keir, Advanced GeoEnvironmental, Inc. (AGE) has prepared the <br /> enclosed work plan for the property at 1601 Turnpike Road, Stockton, California(site). The work <br /> plan was prepared as required by the San Joaquin County Environmental Health Department(EHD) <br /> by letter dated 07 February 2008, to continue delineation of the lateral extent of petroleum <br /> hydrocarbon-impact to ground water at the site, specifically to investigate intermediate and deep <br /> water-bearing zones.A copy of the EHD directive letter is included in Appendix A.Site background <br /> information is included in Appendix B. The location of the site is illustrated on Figure 1; a plan of <br /> the site and surrounding properties is illustrated on Figure 2. <br /> The scope of work was designed to be conducted in conjunction with the additional site assessment <br /> proposed,soil boring and geotechnical soil sounding for 1607 Turnpike Road,Stockton,California <br /> (adjacent-site) (Comfort Air site). The work is proposed due to the co-mingled nature of the <br /> dissolved plumes. Mr. Greg Gaut of Comfort Air, Inc. will receive a copy of the work plan. <br /> This work plan provides a description of the scope of work and procedures to be used for Cone <br /> Penetrometer Testing(CPT)soil boring advancement,ground water sample collection and analysis, <br /> and boring destructions.The plan was prepared in accordance with Central Valley Regional Water <br /> Quality Control Board(CVRWQCB) guidelines for the investigation of underground storage tank <br /> (UST) sites. <br /> 2.0. SCOPE OF WORK <br /> i <br /> Based on analytical data from monitor�ig wells MW-8 (screened from 55-65 feet below surface <br /> grade; bsg), MW-9 (110-120 feet bsg), MW-10 (50-60 feet bsg)and MW-11(55-65 feet bsg),'the <br /> lateral extent of hydrocarbon-impacted intermediate and deep ground water zones are not defined. <br /> The EHD has required further investigation to define and confirm the lateral and vertical extent of <br /> the dissolved petroleum hydrocarbon impacts to ground water. <br /> The proposed scope of work will include the following tasks: <br /> • Permitting and pre-field work activities; <br /> • CPT soil boring advancement; <br /> • Soil boring (hydropunch) and ground water sample collection advancement; <br /> • Analysis of ground water samples; and <br /> • Report preparation. <br /> Advanced GeoEnvironmental,Inc. <br />