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Emcon <br /> 1433 North Market Boulevard -Sacramento California 95834-1943- (916)928-3300- Fax(916)928-3341 <br /> January 24, 1996 <br /> Project 0805-144 02 <br /> W. Kyle Christie <br /> ARCO Products Company <br /> P O Box 612530 <br /> San Jose, California 95161 <br /> Re Fourth Quarter 1995 Status Report for ARCO Service Station No 2076, Located at <br /> 800 East Kettleman Lane, Lodi, California <br /> Dear Mr Christie <br /> At the request of ARCO Products Company (ARCO), EMCON is conducting an <br /> environmental investigation at the subject site (see Figure 1) We have prepared this status <br /> report on the work conducted during the fourth quarter 1995, which included measuring <br /> depths to groundwater, collecting groundwater samples from the wells for subjective and <br /> laboratory analyses, and calculating the groundwater gradient and direction of groundwater <br /> flow beneath the site. <br /> BACKGROUND <br /> Work performed prior to this quarter included drilling 19 soil borings and installing <br /> 4 groundwater monitoring wells (MW-1 through MW-4) and 7 vapor extraction wells <br /> (VW-1 through VW-7) (RESNA Industries, Inc., [RESNA], June 26, 1992, and RESNA, <br /> April 15, 1993) The locations of the soil borings, wells, and other site features are <br /> presented on Figure 2 Residual hydrocarbons were analytically identified in soil samples <br /> collected from borings near the tank cavity and dispenser island <br /> RESNA (formerly Applied GeoSystems) performed a vapor extraction test on July 30, <br /> 1991 (RESNA, September 12, 1991) In November 1991, RESNA observed the removal <br /> of five gasoline storage tanks and associated product lines, and excavation of a new tank <br /> cavity (RESNA, June 26, 1992) ARCO's contractors installed new tanks in the tank cavity <br /> east of the station building in November 1991 <br /> ARCO initiated groundwater monitoring in October 1992. Results have indicated that <br /> dissolved hydrocarbons have not been detected in groundwater, with the exception of total <br /> xylenes, which were detected in well MW-3 at a concentration of 0 7 part per billion (ppb) <br /> during the fourth quarter 1993 <br />• GROUNDWATER MONITORING. FOURTH QUARTER 1995 <br /> EMCON was contracted by ARCO to monitor the groundwater in the monitoring wells <br /> previously installed at the site. Field work included measuring depths to groundwater and <br /> SACW WM805\08051440 2DS-96\pas 1 <br />