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Additional Site Assessment Report - August 2008 <br /> RALPH SQUARE-BUI <br /> 2122 South Airport Way, Stockton, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr. Peter Minh Bui,Advanced GeoEnvironmental, Inc. (AGE)has prepared the <br /> enclosed Additional Site Assessment Report for the property located at 2122 South Airport Way, <br /> Stockton, California (site). The scope of work included the installation of four additional ground <br /> water monitoring wells and one deep screened ground water monitoring well on site,advancement <br /> of one soil probe boring off-site, collection of soil samples and one grab ground water sample,and <br /> preparation of this report. The location of the site is illustrated in Figure 1. A plan of the site is <br /> illustrated in Figure 2. Site background information is summarized in Appendix A. <br /> The work was performed as directed by the San Joaquin County Environmental Health Department <br /> (EHD) by letter dated 22 October 2007 (Appendix B) and is in accordance with Central Valley <br /> Regional Water Quality Control Board(CVRWQCB) guidelines for investigation of UST sites. <br /> 2.0. PROCEDURES <br /> Field work was performed in accordance with guidelines issued by the CVRWQCB for the <br /> investigation of UST sites. Monitoring well installation and CPT soil boring advancement <br /> procedures were outlined in the AGE-prepared Additional Site Assessment Work Plan -December <br /> 2007, dated 21 December 2007, and approved by EHD in a letter dated 02 January 2008. <br /> 2.1. WELL INSTALLATION <br /> Five ground water monitoring wells(MW-7 through MW-11)were installed at the site on 19 March, <br /> 20 March and 21 March 2008,and were surveyed on 29 April 2008.Well locations are depicted on <br /> Figure 2. <br /> 2.1.1. Drilling and Sampling <br /> On 19 March, 20 March, and 21 March 2008, five soil borings (MW7 through MW11) were <br /> advanced at the site using a CME-75 truck mounted drill rig to advance 8.25-inch diameter <br /> hollow-stem augers to depths of 50 feet below surface grade(bsg)(MW7 through MW 10)and 110.5 <br /> feet bsg (MW 11). The drill rig and four-person crew were supplied by Mitchell Drilling <br /> Environmental, Inc. of Eureka, California. Auger returns generated by drilling were containerized <br /> in properly labeled Department of Transportation(DOT)-approved model 17H 55-gallon drums and <br /> were stored on-site. <br /> Advanced GeoEvironmental,Inc. <br />