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r' <br /> INTRODUCTION <br /> This work plan describes the proposed Phase II site assessment to be per- <br /> formed at the Alden Park Area in Tracy, California. The plan addresses the <br /> requirements called for in Chevron Pipe Line Company's Proposal Sheet No. <br /> SF-86084 and presented in our proposal of January 11 , 1987. The schedule for <br /> i' the work plan has been modified from our proposal to include plan review by the <br /> 4 Central Valley Regional Water Quality Control Board (RWQCB). <br /> F� The Alden Park area is located in thesouthwest region of Tracy, California <br /> (Plate 1) and was formerly the site of an oil storage reservoir facility. The <br /> 1, site is now occupied by a city park within a residential area. The former <br /> reservoir facility consisted of a concrete-lined circular tank. In the Spring <br /> ' of 1986, concrete and subsurface oil were uncovered adjacent to the eastern <br /> i <br /> perimeter of Alden Park. During a subsurface investigation by Kennedy/Jenks/ <br /> Chilton in October 1986, concrete was found under much of the Alden Park site . <br /> The approximate location of the concrete slab is shown on Plate 2. <br /> SITE INVESTIGATION <br /> 6 <br /> INTRODUCTION <br /> This work plan describes the approach that will be followed to accomplish <br /> the following scope of work: <br /> o Confirmation of the location of the original concrete perimeter; <br /> o Identification and sampling of suspected locations of former sump(s); <br /> o Evaluation of whether free oil is present beneath the reservoir slab <br /> and step-out as necessary to define extent; <br /> o Evaluation of the concentration of dissolved hydrocarbons just out- <br /> side the free oil plume (if present); <br /> E' <br /> o Evaluation of the groundwater flow direction and gradient; <br /> � o Sampling and analysis of soil from approximately 100 borings advanced <br /> a <br /> using portable equipment in residential backyards; <br /> �tJED2/H _1_ <br />