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1 r r Excavation and Sampling Report VOLPI Property 14210 West State Route Four, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with the request Herum,Crabtree,Dyer,Zolezzi and Terpstra,LLP and Nancee Volpi, Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed report regarding the characterization and removal of soil from the property at 14210 West State Route Four, Stockton, California (the site). Soil and water samples were collected in accordance with AGE proposal 98- 1545. The location of the site is illustrated in Figure 1 -Location Map. A layout of the maintenance compound on the property is illustrated in Figure 2 -Site Plan. The sampling requirements were performed in accordance with guidelines for investigation of underground storage tank(UST)sites established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water Quality Control Board (CVRWQCB). 2.0. BACKGROUND 2.1. SITE DESCRIPTION The site is located approximately thirteen miles west of Stockton in an agricultural area(Figure 1) and is east of the Middle River Bridge on Highway Four. Two buildings and one metal storage shed located in the maintenance compound area are shown in Figure 2. AGE has been informed that the property was operated as a ranch since the 1950s. 2.2. ABOVEGROUND STORAGE TANK Based on the information currently at AGE's disposal, two separate aboveground storage tanks (ASTs)have been operated at the site: one 7,500 gallon diesel AST and one 1,000-gallon gasoline AST. The diesel AST is located on the eastern edge of the maintenance compound on the property and the gasoline AST is located near the center of the maintenance compound. 2.3. ON-SITE RECONNAISSANCE In June 1998, AGE personnel visited the site at the request of Herum, Crabtree et al, to identify locations on the property that potentially have subsurface impacts resulting from past and current site usage and related activities. Three area of concern were noted: a large(7,500-gallon)diesel AST which appeared to be leaking fuel from the dispensing location onto the dispenser pad; a smaller Advanced GeoEnviron mental,Inc.