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• • 6ETTLER-RYAN INC. MONITORING WELL INSTALLATION REPORT at Chevron Station 49-5775 301 West Kettleman Lane Lodi, California Report No 346405 06-1 INTRODUCTION This report presents the results of a subsurface investigation performed by Gettler-Ryan Inc (GR) at the above referenced site The work was performed at the request of Chevron Products Company (Chevron) to further 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 municipal well #12 located to the southwest (Figure 3) The scope of work performed included obtaining the required well installation permits from San Joaquin County Environmental Health Division (SJCEHD) and encroachment permits from the City of Lodi and Caltrans, updating the site safety plan, installing five groundwater monitoring wells, one groundwater extraction well, four vapor extraction wells, and two soil borings, collecting soil samples, developing and collecting groundwater samples from the wells, analyzing selected soil and groundwater samples, surveying well head elevations, and preparing a report documenting the work performed This work was initiated by Chevron, and was not requested by SJCEHD or the Regional Water Quality Control Board Work performed was originally proposed in GR's Work Plan For Monitoring Well Installation (report #346408 06, dated November 11, 1999) and GR's Addendum to GR Report No 346408 06 (report #346408 07, dated February 9, 2000), and approved by SJCEHD (Appendix B) 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 piping Very Iow to non-detectable concentrations of petroleum hydrocarbons were detected in all the soil samples from beneath the waste oil USTs, the product lines, the hydraulic hoist, and five of the six samples from the gasoline UST pit The sample from 14 5 feet below ground surface (bgs) beneath the eastern end of the middle gasoline UST contained 14,000 parts per million (ppm) of Total Petroleum _, 6747 Sierra Court, Suite J - Dublin, California 94568 - (925) 551 -7555