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Preliminary Site Assessment Work Plan PREM DOR 433 Scotts Avenue, Stockton, California 1.0. INTRODUCTION At the request of Dr. Sonya F. Olbrantz of Masonite International / Prem Dor, Advanced GeoEnvironmental,Inc.(AGE)has prepared the enclosed preliminary site assessment work plan for 433 West Scotts Avenue, Stockton, California(site). The scope of work includes the advancement of three soil borings for the collection of soil and ground water samples. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. The San Joaquin County Environmental Health Department (EHD) has directed by letter dated 18 April 2002 that a work plan be prepared to investigate the extent of contamination in the soil and ground water at the site(Appendix A).This work plan has been prepared in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tanks (UST) sites. 2.0. BACKGROUND The site is on West Scotts Avenue approximately 250 feet east of the intersection with Lincoln Street, in an industrial/commercial area of West Stockton(Figure 2). The site is situated in an area of low topographic relief at an estimated elevation of 13 feet above sea level(Figure 1).The property is currently occupied by the Prem Dor Corporation. 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is located within the northern San Joaquin Valley which comprises part of the Great Valley geomorphic province of California. The San Joaquin Valley is formed by the Great Valley geosyncline,which is a large, elongate,northwest-trending asymmetrical structural trough(basin). It is bordered by the Coast Ranges to the west, the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east. This trough has been filled with sediments derived from both marine and continental sources. Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than 20,000 feet in the south central portion of the valley. The sedimentary formations range in age with the older deposits being primarily marine in origin and the younger deposits being primarily continental. Continental-derived sediments were primarily deposited in lacustrine,fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the valley(Olmsted and Davis, 1961).The site is located on unconsolidated and semi-consolidated alluvium,lake,playa and terrace deposits of Quaternary age(California Division of Mines and Geology, 1977). Advanced GeoEnviron mental,Inc.