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a M C 0 n <br /> 1433 North Market Boulevard • Sacramento California 95834-1943• (916)92800+ Fax(916)928-3341 <br /> lie <br /> January 24, 1996 <br /> Project 0805-142 003 <br /> Mr Kyle Christie <br /> ARCO Products Company <br /> P 0 Box 612530 <br /> San Jose, California 95161 <br /> Re Fourth Quarter 1995 Status Report for ARCO Service Station No 760, Located at <br /> 225 South Cherokee Lane, Lodi, California <br /> Dear Mr Christie <br /> At the request of ARCO Products Company (ARCO), EMCON is conducting an environmental <br /> investigation at the subject site (see Figure 1) We have prepared this status report based on the <br /> work conducted during the fourth quarter 1995, which included measuring depths to groundwater, <br /> collecting groundwater salripIes from the wells for subjective and laboratory analyses, and <br /> calculating the groundwater gradient and direction of groundwater flow beneath the site. <br /> BACKGROUND <br /> In September 1988, RESNA Industries (RESNA [formerly 'Applied GeoSystems]) observed the <br /> removal of an underground waste-oil storage tank located to the east of the station building In June <br /> and July 1991, RESNA obser%ed the removal of three gasoline storage tanks and associated <br /> product piping and two additional waste-oil tanks Analytical results indicated that hydrocarbons <br /> were present at the lulu of the former underground gasoline tank and waste-oil tank cavities <br /> (RESNA, June 25, 1991, Report No 38048-4) <br /> Between May 1990 and January 1994, RESNA investigated the impact of hydrocarbons to the <br /> soil beneath and lust north of the site and the impact to the groundwater beneath the site. A <br /> total of 22 soil borings were drilled on site and 2 soil borings were drilled off site, 3 monitormg <br /> wells, 10 vapor extraction wells, and 1 off-site vapor extraction Vvell were installed at the site. <br /> Boring and well locations are presented on Figure 2. Residual gasoline and diesel hydrocarbons <br /> were detected in the soil beneath the site (RESNA, January 7, 1993, Report No 38048-7; and <br /> RESNA, June 8, 1994, Report No. 38048-11). Dissolved hydrocarbons as gasoline were <br /> detected at relatively low concentrations in all monitoring wells. However, dissolved <br /> hydrocarbons as diesel and oil and grease were below laboratory detection limits <br /> On June 14, 1991, RESNA conducted a vapor extraction test. The results of the test indicated <br /> that vapor extraction is a feasible method of remediating soil at the site. An effective radius of <br /> influence of 22 feet was estimated for the site (RESNA, April 7, 1992, Report No. 38048-5) <br /> 5AC1M PJUA80M805I420.3AS-9SVas i <br />