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Site Investigation Work Plan - September 1997 STOCKTON GOLF AND COUNTRY CLUB 3800 West Countiy Club Boulevard, Stockton, California 1.0. INTRODUCTION In accordance with the request of Mr. David Morris of the Stockton Golf and Country Club, Advcrncecl GeoEnvironmental, Inc. (AGE) has prepared this Site Investigation Work Plan for the collection of soil and ground water samples at 3800 West Country Club Boulevard, Stockton, California. The scope of work initially includes the advancement of six soil probe borings near the former underground storage tank(UST) excavations and collection of soil and "grab" ground water samples. The location of the site is illustrated in Figure 1 - Location Mai. A plan of the site is illustrated on Figure 2 - Site Plcm. This Work Plan is prepared in accordance with the San Joaquin County Public Health Services - Environmental Health Division (PHS-EKD) and Central Valley Regional Water Quality Control Board (RWQCB) guidelines for the investigation of UST sites. 2.0. BACKGROUND 2.1. SITE LOCATION AND DESCRIPTION The site is located in an area of low topographic relief in the city of Stockton, San Joaquin County, California, west of the intersection of Country Club Boulevard and Ranier Avenue. 'The site area is bordered to the north by the Calaveras River and to the south by the Stockton Deep Water Channel. The site area has been utilized as a golf course for at least twenty years. The site is currently occupied by one wood-frame warehouse-style structure. It is our understanding that one 1,000-gallon gasoline and one-1,000 gallon diesel USTs were removed from a maintenance shop area at the site in 1990. Furthermore, one 1,000-gallon gasoline UST was removed frons a golf cart storage area at the site in 1990. Following the removal of the USTs, soil samples were collected from beneath each UST and submitted for laboratory analysis. The results of the analysis indicated that an unauthorized release of hydrocarbons had occurred in both UST areas. 22. REGIONAL GEOLOGIC SETTING According to the Geologic Map of CaliforHia, published in 1977 by the State of California Department of Mines and Geology, the site area is within the Great Valley Geomorphic Province of California, a large, elongate, northwest trending structural trough. The Great Valley Province has been filled to its present elevation with thick sequences of sediment ranging in age from Jurassic to present day, creating a nearly flat lying alluvial plain extending from the Tehachapi Mountains in the Advanced GeoEnvironmental,Inc.