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REMOVING OIL SEEPS <br /> Purpose <br /> The purpose of this task is to remove all active oil seeps. The <br /> active seeps are located in three areas: Palm Circle due east of <br /> Alden Park, the front yard of 788 Sequoia Blvd, and the southeast <br /> corner of Alden Park. Plate 10 shows the areas of the active seeps <br /> and an inactive (shaded) seep north of the park. Appropriate <br /> action will be taken to ensure that the active seeps stop flowing <br /> to the ground surface. <br /> Each seep will be treated in one of two ways. First, for seeps <br /> that will stop flowing if a small amount of saturated soil is <br /> excavated, the surface seep and ground beneath it will be excavated <br /> and backfilled. Second, for seeps that may return once excavated, <br /> a collection vault will be installed to prevent the seep from <br /> reaching the surface. <br /> Specifically: <br /> o Palm Circle and Sequoia Blvd seeps: Soil cores (1-inch <br /> diameter) will be taken near each of the seeps to investigate <br /> subsurface conditions (samples from 2 , 4, and 8 feet will be <br /> retrieved, visually inspected, and saved for possible future <br /> analysis) . At seeps where soil cores show oil saturation <br /> below 4 feet (indicating a deeper source of oil) , a seep <br /> collection vault (see below) will be installed. I£ the deep <br /> soil cores do not show saturation the seep will only be <br /> excavated and backfilled as described below. <br /> o Alden Park seep: A seep collection vault will be installed <br /> to stop the surface seepage. <br /> Any deep sources of oil seeps will be treated by the system <br /> designed for the entire site. <br /> Excavation <br /> Excavation will be accomplished by an operator trained in the <br /> excavation of oily soils. The following procedure will be <br /> followed: <br /> o Appropriate permits will be obtained from the City of Tracy. <br /> o General procedures given earlier will be followed. <br /> o The area affected will be barricaded until all work is <br /> completed. <br /> o The surface seep and the ground beneath it will be excavated <br /> to a 4 foot depth (maximum, shallower if a shallow source is <br /> discovered) . During excavation the site will be monitored for <br /> organic vapors to ensure personnel or public safety is not <br /> endangered. Based on the Dames and Moore vapor assessment we <br /> 10 <br />