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iQuarter yRe ort - Fourth Quarter 2002 <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 this <br /> quarterly report of environmental activities conducted at Comfort Air, Inc , 1607 Turnpike Road, <br /> Stockton,California(site) The scope of work included cone penetrometer testing(CPT),monitoring <br />' well installation and abandonment, and a quarterly ground water monitoring event The objective <br /> of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground water and <br /> to characterize ground water flow direction and gradient on the site The location of the site is <br />' illustrated in Figure 1, a plan of the site is illustrated in Figure 2 <br /> This report is prepared in accordance with guidelines issued by the Central Valley Regional Water <br />' Quality Control Board (CVRWQCB) for investigation of underground storage tank(UST)sites A <br /> summary ofprevious investigations at the site was included in the AGE-prepared Quarterly Report- <br /> February 1997,dated 18 April 1997,and Monitoring Well Installation Work Plan-July 1998, dated <br />' 23 July 1998 A summary of environmental assessment activities is included in Appendix A <br />' 2 0 PROCEDURES <br /> Field activities were performed in accordance with guidelines for investigation of underground <br />' storage tank(UST) sites and sampling ground water monitoring wells issued by the Central Valley <br /> Regional Water Quality Control Board(CVRWQCB)and by the S an Joaquin County Environmental <br /> Health Department (EHD),respectively <br /> 21 CONE PENETROMETER TEST INVESTIGATION <br />' On 10 October 2002, a soil boring (CPT-01) was advanced vertically on-site to a total depth of <br /> approximately 147 feet below surface grade (bsg), utilizing CPT technology to characterize the <br />' geological and hydrogeological framework and to identify potential contaminant-migration pathways <br /> beneath the site Based on the CPT lithologic sounding data, depth-discrete "grab" ground water <br /> samples and a soil sample were collected in a "twin" soil boring placed immediately adjacent to <br /> t CPT-01,the water samples collected were assigned the boring designation of the initial CPT boring <br /> (CPT-1) However,the twin boring could only achieve a maximum sampling depth of approximately <br /> 117 feet bsg before encountering refusal. <br /> 1 <br /> 2 1 1 Cone Penetrometer Test Lithologic Sounding <br />' The CPT investigation utilized a 25-ton truck-mounted CPT dnll rig equipped with 1 50-inch <br /> • diameter h ollow-stem rods A h ydraulic ram w as u tilized t o advance a c one p enetrometer tip <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />