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SITE CLOSURE EVALUATION REPORT <br /> BEACON STATION NO. 502 D <br /> 35 NORTH CHEROKEE LANE <br /> LODI, CALIFORNIA JUN 0J <br /> IDELTA PROJECT NO. D093-907 V� 8 1995PF�"MENt <br /> 1.0 INTRODUCTION <br />' Delta Environmental Consultants,Inc. (Delta), has been authorized by Ultramar Inc. (Ultramar)to review <br /> remedial actions conducted at Beacon Station No. 502, located at 35 North Cherokee Lane, Lodi, San <br />' Joaquin County, California, and to evaluate whether these remedial actions have reduced concentrations <br /> of petroleum hydrocarbons in the subsurface to levels which would warrant regulatory closure of this site. <br /> This report summarizes work conducted at the site and presents our findings. This report has been <br /> prepared in accordance with Appendix B of the Tri-Regional Board Staff Recommendations for <br /> Preliminary Investigation and Evaluation of Underground Tank Sites dated March 1, 1994, by the <br /> California Regional Water Quality Control Board, Central Valley Region (CRWQCB). <br /> 1 <br /> 2.0 PROTECT BACKGROUND INFORMATION <br /> 2.1 Site Description <br /> The site is a retail gasoline station located at the southwest corner of Cherokee Lane and Elm Street in <br /> Lodi, California. The location of the site is shown in Figure 1. The site is paved with asphalt and <br /> concrete and is occupied by a cashier office/convenience market, two gasoline dispenser islands, and a <br />' canopy. There are three double-walled underground storage tanks at the site which contain regular <br /> unleaded, unleaded plus, and supreme unleaded gasoline. The elevation of the ground surface at the site <br />' is approximately 53 feet above mean sea level and the topography in the vicinity of the site is virtually <br /> flat. A site map is shown in Figure 2. <br /> The surrounding area includes retail stores along Cherokee Lane and to the east of the site, and residential <br /> neighborhoods north, south, and west of the site. <br /> 2.2 Site History <br /> The presence of petroleum hydrocarbons in soil and ground water beneath the site was detected during <br /> removal of a 10,000 gallon diesel fuel tank in September 1986, and installation of monitoring wells <br /> MW-1, MW-2, and MW-3 in October 1986. Monitoring wells MW-4 and MW-5 were installed in <br /> November 1986 and March 1987, respectively, and vapor extraction wells VW-6 through VW-9 were <br /> RPT139.SJS <br />