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LUSH GEOSCIENCES GEOLOGICAL AND ENVIRONMENTAL SERVICES June 21, 1996 ' 530-001 Mr Russell Chapin 1203 North Carlton Ave Stockton, CA 95203 tSubject Executive Summary of Interim Report Underground Storage Tank Site Investigation Chapin Brothers Automotive 1766 Monte Diablo Ave, Stockton, California Dear Mr Chapin i Lush Geosciences is pleased to present the attached report describing a subsurface environmental investigation performed at the Chapin Brothers Automotive site The site is located on the southeast corner of the intersection of Buena Vista and Monte Diablo Avenues in Stockton, California The report summarizes previous work performed at this site, describes methods and procedures used during of drilling 3 soil borings, installing two 4-m diameter vapor extraction wells and one 2-in diameter groundwater monitoring well in the bonngs, and collecting soil and groundwater samples for laboratory analysis The vapor well locations were selected in accordance with an approved remedial action plan, while the location of the monitoring well was selected to delineate the boundary of the contamination plume The report also presents our conclusions and recommendations based on the data and information generated by the ' contamination assessment and the previous work performed The results of analyses of the soil samples collected at the site detected gasoline (TPHg) and volatile gasoline constituents (BTEX) in two of the borings (LB2, onsite, and LB3, offsite), most prominently in the water bearing zone and in saturated soil from 15 to 20 ft below the ground surface The groundwater surface has been between approximately 17 and 19 ft below grade during this period of activity Groundwater flow was found to be generally to northwest (N65° W) with a gradient of 0 0019 ft/ft 530-001 3560 BUSINESS DRIVE, SUITE 120 0 SACRAIMENTO, CA 95820 * (916) 737-9294 e FAX (916) 737-9298