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6ETTLER-RYAN INC. WORK PLAN FOR MONITORING WELL INSTALLATION at Former Chevron Service Station #9-5775 301 West Kettleman Lane Lodi, California Report No. 346408.06 INTRODUCTION At the request of Chevron Products Company (Chevron), Gettler-Ryan Inc. (GR) has prepared this Work Plan to drill four on-site soil borings, install three off-site and one on-site groundwater monitoring wells, and install two on-site vapor extraction wells at the subject site. The purpose of this investigation is to evaluate the extent of petroleum hydrocarbons in the soil on-site and in the soil and groundwater south and west of the subject site, between the site and a municipal well located to the southwest (Figure 3). The proposed scope of work includes: obtaining the required well installation and encroachment permits; drilling four soil borings; installing four groundwater monitoring and two vapor extraction wells; collecting soil samples for possible chemical analysis; developing and sampling the newly installed wells; surveying all wells; analyzing selected soil and groundwater samples; and preparing a report presenting the findings of the investigation. The scope of work described in this Work Plan is intended to comply with the State of California Water Resources Control Board's Leaking Underground Fuel Tanks (LUFT) Manual and California Underground Storage Tank Regulations, 1994, the California Regional Water Quality Control Board's (CRWQCB) Tri -Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites, and San Joaquin County Public Health Services (SJCPHS) guidelines. SITE DESCRIPTION The subject site is located between South Lee Avenue and South Pleasant Avenue adjacent to Kettleman Lane in Lodi, California (Figure 1). The site was most recently developed as a service station with four service bays, three dispenser islands, one sales kiosk, three 10,000 -gallon gasoline underground storage tanks (USTs), one 1,000 -gallon waste oil UST, one 550 -gallon previously abandoned waste oil UST, and one in -ground hydraulic hoist. All aboveground and subsurface facilities have been removed. The site is currently an unpaved vacant lot. Locations of the previous facilities are shown on the Site Plan (Figure 2). PREVIOUS ENVIRONMENTAL WORK The five former USTs, former hydraulic hoist, former dispenser islands and associated product piping were removed on August 24, 1998. Soil samples were collected from beneath the USTs and product 6747 Sierra Court, Suite J • Dublin, California 94568 • (925) 551-7555