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i • 16 January 1997 . AGE-NC Project No 97-0290 Page 2 of 5 the excavation However, laboratory analysis of soil samples are not available According the PHS- EHD, the UST excavation was then backfilled with imported"clean" soil prior to March 1989 24 ADVANCEMENT OF SOIL BORING,NOVEMBER 1989 One soil boring was advanced to a depth of 40 feet at the site in November 1989 Hydrocarbons odors were noted in the boring, however no soil samples analysis were performed Drilling was aborted and the boring was backfilled with grout 25 GROUND WATER DEPTH AND FLOW DIRECTION Ground water depth at the site is considered to be approximately 50 to 55 feet below surface grade, based upon data obtained from ground water wells in the area of the site and the map entitled Lines of Equal Depth to Ground bI ater in well - Fall 1993, prepared by the San Joaqui:z County Flood Control and Water Conservation District Regional ground water flow direction in Lodi is south- southwest However, flow direction can vary seasonally and due to localized conditions 3 0. SCOPE OF WORK 3 1 DRILLING AND SAMPLING AGE proposes to initially advance five soil borings to a depths up to 65 feet below surface grade (bsg) Borings may be advanced to greater depths or additional probings installed based upon field observations Borings will be advanced using a truck-mounted drill rig and hollow-stem augers Three of the borings will be completed as ground water monitoring wells Boring locations are illustrated on Figure 3 3 2 EQUIPMENT DECONTAMINATION All sampling tools and sample liners used for sample collection will be thoroughly rinsed with clean water after washing with a solution of Alconox Augers will be steam-cleaned between borings 3 3 LABORATORY ANALYSIS Selected soil samples will transmitted to a State-certified laboratory for analysis Samples collected i