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Additional Site Assessment Work Plan <br /> COMFORT AIR,INC. <br /> 1607 Turnpike Road, Stockton, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr. Greg Gaut, Advanced GeoEnvironmental, Inc. (AGE) has prepared the <br /> enclosed work plan for the property at 1607 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 and vertical extent of <br /> petroleum hydrocarbon impact to ground water at the site. A copy of the EHD directive letter is <br /> included in Appendix A; site background information is included in Appendix B. The location of <br /> the site is illustrated on Figure 1; a plan of the site and surrounding properties is illustrated on <br /> Figure 2. <br /> The scope of work was designed to be performed in conjunction with the additional site assessment <br /> (soil boring and geotechnical soil sounding)proposed for the adjacent Lopez Property site located <br /> at 1601 Turnpike Road,Stockton,California.The work is proposed due to the co-mingled nature of <br /> the dissolved hydrocarbon plumes. <br /> This work plan provides a description of the scope of work and the procedures to be used for Cone <br /> Penetrometer Testing(CPT)soil boring advancement,monitoring well installation,soil and ground <br /> water sample collection and analysis,and boring abandonment.The plan was prepared in accordance <br /> with Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the <br /> investigation of underground storage tank(UST) sites. <br /> 2.0. SCOPE OF WORK <br /> Based on analytical data from on- and off-site monitoring wells,the lateral extent of hydrocarbon- <br /> impacted groundwater is undefined along the eastern boundaries of the site, south and southeast of <br /> the former UST area of the adjacent Lopez Property site. In addition, the vertical extent of <br /> hydrocarbon-impacted ground water is undefined on-site in the former UST area. The EHD has <br /> required further investigation to define and confirm the lateral and vertical extent of the dissolved <br /> 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 and sample collection; <br /> • Monitoring well installation and sampling; and <br /> • Report preparation. <br /> Advanced GeoEnvironmental,Inc. <br />