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SITE CHARACTERIZATION WORK PLAN <br /> CITY OF STOC TON <br /> �e <br /> FIRE STATION NUMBER ONE <br /> r 1701 WEST WASHINGTON STREET <br /> STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> This work plan outlines a proposed work scope o characterize the extent of petroleum <br /> r product constituent (PPC) migration in sub-surface soil and groundwater at the City of <br /> i Stockton, Fire Station Number One (site), in Stockton, California. The source of the PPCs <br /> ` is an apparent release from an underground storag tank (UST) maintained at the site until <br /> r„ December, 1992. <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 /> 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 hydrolo is characteristics, and the project history <br /> are summarized in the following subsections. <br /> 2.1 Site Description: Fire Station Number O ae is located at 1701 West Washington <br /> Street, at the northwest corner of Fresno and est Washington Streets in the city of <br /> Stockton, California (Drawing 1). A site plan oft e site depicting existing features and the <br /> ;�. former UST location is shown on Drawing 2. <br /> 2.2 Geologic and Hydrologic Characteristics: The following subsections summarize the <br /> 3 geology and hydrology of the Stockton area. <br /> 2.2.1 Geolo : The site is in the northern portion of the San Joaquin Valley within the <br /> 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 fi led with a sequence of older to younger <br /> alluvium of Pliocene to Holocene age which overlie sedimentary rocks of Cretaceous to <br /> F, Tertiary age. These sedimentary units., in turn, overlie a crystalline basement of Paleozoic <br />