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Preliminary Investigation and Evaluation Report AD ART SIGN CORPORATION 3133 North Ad Art Road, Stockton, California 16- 1.4. INTRODUCTION In accordance with the request of Mr. Paul Bischofberger of Ad Art Sign Corporation, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Preliminary Investigation and Evaluation Report (PIER) for the property located at 3133 North Ad Art Road, Stockton, California. The scope of work included the advancement of three soil probe borings and collection and analysis of soil samples. Background information for the site was summarized in UST Removal Report, dated 06 April 1999 and prepared by AGE. Ground water is currently approximately 50 feet below surface grade (bsg) 169 in monitoring wells located approximately 1,000 feet northwest of the subject property. The location of the site and the immediately surrounding area are illustrated on Figure 1. The structures and soil probe boring locations are depicted on Figure 2, W 2.0. PROCEDURES Field work was performed as proposed in the approved work plan Site Assessment Work Plan dated 03 January 2000 and prepared by AGE in accordance with San Joaquin County Public Health +� Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites. V 2.1. PROBING AND SAMPLING On I I April 2000, three soil probe borings (probings) were advanced at the site using AGE's Geoprobe 5400 soil probing unit equipped with 1.25-inch diameter probe rods and a 1.5-inch diameter soil sampling assembly. Probings B 1, B2 and B3 were advanced to depths of 30 feet below surface grade (bsg). The probe boring locations are shown on Figure 2. Soil samples were collected at 5-foot intervals, beginning at a depth of 5 feet bsg, 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 Teflon sheets, capped and sealed with tape. The sleeves were labeled and placed in a chilled container and selected samples were transported under chain-of-custody to Alpha Analytical Laboratories, Inc. (AAL) in Ukiah, California,a State of California Department of Health Services(DHS)-certified analytical laboratory. All probe rods and sampling tools used for sample collection were thoroughly rinsed with clean water after washing with a solution of Alconox between each sampling run. All probings were backfilled over their entire depth with portland cement. Adrarrced CeoLm-ironmental,Inc.