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_ 1 SITE INVESTIGATION REPORT - UST No. 8 ` Former Chase Chevrolet (Madison) Facility 423 North Madison Street, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with the request of Mr. Jeffery Setness of Hartmann & Setness, Advanced GeoEnvironmental, Inc. (AGE)has prepared this report of site investigation activities performed at 423 North Madison Street, Stockton, California. Petroleum hydrocarbons were detected in samples collected during the removal of underground storage tank(UST)No. 8.Although hydrocarbons were not detected by laboratory analytical methods, hydrocarbon odors were detected in soil samples collected from soil probe borings advanced near the former UST location. Additional assessment was subsequently required by the PHS-EHD to determine the lateral and vertical extent of impacted soil and ground water in the vicinity of former UST No. 8. The current scope of work included advancement of three soil probe borings and collection of soil and grab ground water samples. The objective of this investigation was to determine the extent of impacted soil and ground water at the former location of UST No. 8. The site location is illustrated on Figure 1 -Location Map. Structures and soil probe boring locations are illustrated on Figure 2 - Site Plan. Field work was performed in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Regional Water Quality Control Board - Central Valley Region (RWQCB-CVR) guidelines for the investigation of UST sites. C 2.0. PROCEDURES 2.1. PROBING AND SAMPLING On 04 December 1997, three soil probe borings (probings) were advanced at the site using AGE's Geoprobe 5400 probing unit equipped with 1.25-inch diameter probe rods and a 2.15-inch diameter soil sampling assembly. Probings GP35, GP36 and GP37 were advance at the center, northeast and north of the former UST No. 8 location and were advanced to depths of 45, 35 and 60 feet below surface grade (bsg), respectively. Probing locations are shown on Figure 2. Soil samples were collected at five-foot intervals beginning at a depth of 15 feet bsg in GP35 and beginning at a depth of 10 feet bsg in GP36 and GP37. All samples were collected using the Geoprobe soil sampling assembly loaded with four 1.125-inch by 6-inch brass sleeves. After collection, the ends of the second brass sleeve were covered with aluminum sheets, capped and sealed with tape. The sleeves were labeled, placed in a chilled container and selected samples were .� transported to McCampbell Analytical, Inc. (MAI) in Pacheco, California, under chain-of-custody. e. ` Advanced GeoEnviron mental,Inc. Advanced GeoEm'ironmental,Inc.