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La SITE CHARACTERIZATION WORK PLAN <br /> CITY OF STOCKTON <br /> FIRE STATION NUMBER NINE <br /> 550 EAST HARDING WAY <br /> STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> This work plan outlines a proposed work scope to characterize the extent of petroleum <br /> product constituent (PPC) migration in sub-surface soil and groundwater at the City of <br /> Stockton, Fire Station Number Nine (site), in Stockton, California. The source of the PPCs <br /> 'r is an apparent release from an underground storage tank (UST) maintained at the site until <br /> November 1990. <br /> This work plan was commissioned by Mr. Robert Murdock of the City of Stockton, Public <br /> Works Department, Solid Waste Division on April 5, 1996 with the issuance of the City of <br /> Stockton Purchase Order Number 079283. Mr. Murdock can be contacted at the City of <br /> Stockton's Public Works Department at 425 El Dorado Street, Stockton, California, <br /> telephone number (209) 937 - 8829. <br /> ti.. <br /> This work plan was prepared by The Twining Laboratories, Inc. (Twining), Environmental <br /> Service Division. <br /> 2.0 BACKGROUND <br /> A description of the site, the geologic and hydrologic characteristics, and the project history <br /> are summarized in the following subsections. <br /> i... 2.1 Site Description: Fire Station Number Nine is located at 550 East Harding Way <br /> between California Avenue and Cemetery Lane in the city of Stockton, California (Drawing <br /> 1). A site plan of the site depicting existing features and the former UST location is shown <br /> on Drawing 2. <br /> 2.2 Geologic and Hydrologic Characteristics: The following subsections summarize the <br /> geology and hydrology of the Stockton area. <br /> 2.2.1 Geology: The site is in the northern portion of the San Joaquin Valley within the <br /> 'r southern portion of the Great Valley geomorphic province of California. The Great Valley <br /> is a nearly flat northwest to southeast trending structural basin approximately 450 miles long <br /> by 50 miles wide. The Great Valley has been filled with a sequence of older to younger <br /> alluvium of Pliocene to Holocene age which overlie sedimentary rocks of Cretaceous to <br /> Tertiary age. These sedimentary units, in turn, overlie a crystalline basement of Paleozoic <br />