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Revised Monitoring Well Installation Work Plan Former BLUE STAR GASOLINE 4040 East Main Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Khalid Anber,property owner,Advanced GeoEnvironmental,Inc. (AGE)has prepared this Revised Monitoring Well Installation Work Plan for the property located at 4040 East Main Street,Stockton,California.The location of the site is illustrated on Figure 1 and a plan of the site is illustrated on Figure 2. This work plan includes minor revisions to the Monitoring Well Installation Work Plan, dated 01 March 2004, as discussed by telephone and electronic mail. This work plan is prepared at the request of a San Joaquin County Environmental Health Department (SJCEHD).Procedures outlined within the work plan are described in accordance with the California Regional Water Quality Control Board - Central Valley Region (CVRWQCB) guidelines for the investigation of underground storage tanks (UST) sites. 2.0. BACKGROUND A gasoline station and mini-mart previously occupied the site. Three USTs operated on the site for approximately forty years and were removed from the site in March 2002 by AGE.The UST system also included two dispensers. 2.1. SITE DESCRIPTION The site is bounded on the north by Main Street and on the east by Oro Avenue. A single structure occupies the central portion of the site.Residential and/or commercial properties lies north beyond Main Street and south of the site. 2.2. REGIONAL GEOLOGIC/HYDROGEOLOGIC CONDITIONS The site is situated within the Great Valley Geomorphic Province of California, a large, elongate northwest tending, asymmetric structural trough. The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to recent, creating a nearly flat lying alluvial plain,which extends from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively. Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origin. The Great Valley Province has been subdivided into two major divisions identified as the Sacramento and San Joaquin Valleys. Advanced GeoEnvironmcntal.Inc.