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� s.. Additional Site Assessment Report - December 2003 CHAPIN BROTHERS INVESTMENTS,INC. 1766 Monte Diablo Avenue, Stockton, California 10. INTRODUCTION At the request of Me Russell Chapin of Chapin Brothers Investments, Inc , Advanced GeoEnvironmental,Inc (AGE)has prepared this Additional Site Assessment Report of field activities conducted at 1766 Monte Diablo Avenue, Stockton, California The site setting is illustrated in Figure 1 Structures and well locations on or near the site are illustrated in Figure 2 Soil samples were collected in November and December 2003 to determine the effectiveness of site corrective action and to aid in determination of the remaining hydrocarbon mass impacting soil beneath the on-site garage building Site history and findings from previous investigations and monitoring events at the site are summarized in Problem Assessment Report (PAR) prepared by Science&Engineering Analysis Corporation(SEACOR)dated 22 July 1994,and in Appendix A of this report 2.0. PROCEDURES On 21 November, 24 November and 01 December 2003, soil probe borings were advanced beneath the on-site garage building, an area that had not been sampled during previously site investigations Soil sampling activities were perfonned in accordance with guidelines established by Central Valley Regional Water Quality Control Board (CVRWQCB) and were performed in accordance with the Additional Site Assessment Work Plan, dated 17 November 2003, which was approved by the San Joaquin County-Environmental Health Department (EHD) by letter dated 20 November 2003 A drilling pen-nit (SR0036126) was issued by the EHD on 20 November 2003, and Mr Harlin Knoll of the EHD provided on-site inspections 2 1 PROBE BORINGS AND SAMPLING Five soil probe borings(CBG through CB 10)were advanced at a 30 degree angle beneath the on-site garage building, to a vertical depth of 34 feet below surface grade (bsg), utilizing a van-mounted Geoprobe 5400 direct-push probing unit equipped with 1 25-inch diameter probing rods Probe soil borings CB6 and CB7 were advanced under the north face of the building, and borings CB8, CB9 and CB 10 were advanced under the west face of the building, locations of the soil probe borings are illustrated on Figure 2 I Continuous soil samples were retrieved using a Geoprobe four-foot macro core barrel loaded with one four-foot acetate sleeve Soil samples were preserved by covering both ends of a separated, • approximately 6-inch portion of the acetate sleeve with oil probe boring location, depth, time,date and sampler's initials Advanced GeoEnvironmental,Inc