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Well Installation Report FORMER OCAMPO PROPERTY 821 South Wilson Way, Stockton, California 1.0. INTRODUCTION At the request of Mr. Victor Aranda, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Well Installation Report for the property located at 821 South Wilson Way, Stockton, California. (site). The scope of work included installation, development and survey of three on and off-site ground water monitoring wells, two soil vapor wells and preparation of this report. The location of the site and the surrounding area are illustrated on Figure 1; structures, former underground storage tank (UST) locations, and soil boring and monitoring well locations are illustrated on Figure 2. Additional site background information is provided in Appendix A. Three ground water monitoring wells and two soil-vapor wells were advanced for vertical and lateral delineation of petroleum hydrocarbon contamination in the area of the former eastern underground storage tank (UST), south, and west of the former UST. 2.0. PROCEDURES On 24, 25, 26 June 2008 two ground water monitoring wells and two soil vapor wells were installed on-site near the former UST location. On 26 August 2008 one off-site ground water monitoring well was installed in the city sidewalk approximately 180 feet south of the intersection of East Taylor Street and Wilson Way Frontage Road. Field work was conducted in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of UST sites. Well installation procedures were outlined in the AGE-prepared Additional Site Assessment Work Plan dated 18 February 2008 and approved by EHD letter dated 12 March 2008. 2.1. MONITORING WELL INSTALLATIONS Between 24 and 26 June 2008, four soil borings (MW5, MW6, VW1, and VW2) were advanced at the site using a CME-75HT Limited Access truck mounted drill rig to advance 8.25 or 10-inch diameter hollow-stem augers to total depths of 55 feet (MW5) below surface grade (bsg), 75 feet bsg (MW6) and 35 feet bsg (VW1 and VW2); on 26 August 2008, soil boring MW4 was advanced off-site to a total depth of 55 feet bsg. The drill rig and three-man crew were supplied by Cascade Drilling, Inc. of Rancho Cordova, California. Auger returns generated by the drilling were containerized in properly labeled, Department of Transportation (DOT)-approved 55-gallon drums and stored on-site pending proper disposal. Soil samples were collected ahead of the drill bit using a California modified split-spoon sampler loaded with three pre-cleaned, 2-inch by 6-inch brass sleeves. The samples were collected from the Advanced GeoEnvironmental, Inc.