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• 6ETTLER-RYAN INC. 1.0 INTRODUCTION MONITORING WELL INSTALLATION REPORT for Former Chevron Service Station #9-5775 301 West Kettleman Lane Lodi, California Report No 346408 04-2 This report summarizes the results of a well installation performed at former Chevron Station #9-5775, located at 301 West Kettleman Lane in Lodi, California The work was performed at the request of Chevron Products Company (Chevron) to evaluate the extent of petroleum hydrocarbon impact to soil and groundwater beneath the subject site The scope of work included conducting a i/h-mile radius well survey, obtaining the required well installation and soil boring permit, drilling five on-site soil borings and installing groundwater monitoring wells in four of these borings, surveying wellhead elevations, developing . and sampling the wells, collecting and submitting soil and groundwater samples for chemical and physical analysis, arranging for Chevron's contractor to dispose of the waste materials, and preparing a report documenting the work This work was proposed in Gettler-Ryan Inc (GR) Report No 346408 04-1, Work Plan for Monitoring Well Installation, dated November 24, 1998, and approved by the San Joaquin County Public Health Services (SJCPHS) on December 4, 1998 (Appendix A) 2.0 SITE DESCRIPTION 2.1 General The subject site is situated on the northern side of West Kettleman Lane, between South Lee and South Pleasant Avenues in Lodi, California (Figure 1) The site was most recently developed as a service station with four service bays, three dispenser islands, one sale 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 former facilities are shown on Figure 2 2.2 Geology and Hydrogeology The subject site is located at the northern boundary of the San Joaquin Valley, approximately 25 miles east of the Sacramento/San Joaquin Rivers delta The San Joaquin Valley comprises the southern portion of the Central Valley which is a large (400 miles long and 50 miles wide) asymmetric trough, bounded by pre - Tertiary age granitic, metamorphic and marine sedimentary rocks of the Sierra Nevada (to the east) and . Coast Ranges (to the west) and filled with as much as 10 vertical miles of sediments ranging in age from Jurassic to Holocene (R W Page, 1986) The Central Valley is drained by the Sacramento River (flowing 6747 Sierra Court, Suite J • Dublin, California 94568 • (925) 551-7555