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217M <br /> I N_ <br /> Ems-@ <br /> Stewart's Beacon <br /> Remedial Action Plan <br /> Page: 2 <br /> by_Western Meter Service of Stockton,California on 20 December 1988 Soil and ground <br /> water samples were collected by California Water Labs,Inc.at the direction of <br /> Cynthia Wagner of San Joaquin Local Health Department. That data has been <br /> summarized in Table 2. <br /> 3.0 PROPOSED REMEDIAL ACTION <br /> 3.1 Excavation of Contaminated Soil <br /> The area around the former location of the fuel tanks is ca <br /> concrete. This covering will be removed and disposed of i -1 p o al landfill. <br /> with ether asphalt or <br /> The pocket of contaminated Soil surrounding the tank will be excavated down to the <br /> r first saturated zone. Ground water in this area is at about 12 feet. Once the water table <br /> has been encountered, the vertical extent of excavation vZill terminate <br /> Information obtained during the <br /> gasoline,motor oil,and BTX occur ta radius of about 20 feet frgation om the cates teenteat r ofthe <br /> levels of <br /> excavation(Figure 2). Since the lateral extent of contamination was not fully defined <br /> during the preliminary investigation,the exact boundary of the excavation cannot be <br /> stated at this time. Therefore,it is proposed to extend the excavation laterally as. <br /> needed to remove the contaminated soil. Calculations have <br /> volume of sediments that should be rer roved. been made to estimate the <br /> The tank removal project left a hole that is roughly 34 x 36 <br /> tank removal and 11 feet deep. During the <br /> approximately 300 cubic yards of soil was also excavated and stockpiled <br /> in two locations on-site. An additional MAO or 600 cubic yards may need to be excavated <br /> to finish removing the contaminated soil <br /> The latcraI extent(f excavation will be determined in the field at the time of <br /> ' excavation. This decision will be r de by Usingthe following <br /> observations of soil discoloration and presence oh drocarsn, Criteria: 1)field <br /> �. measurements of head s a y odor, 2)field <br /> correlation of this data o data calicy ted dugring the prelimiand organic nary investigation.r meter and 3) <br /> Confirmation of this field decision will be made by collecting soil samples from the <br /> sidewall of the excavation and analyzing them for total petrole <br /> (TPH). um hydrocarbons <br /> TPH include volatile(gasoline)extractable <br /> [ petroleum.(diesel-&-motor oil)and the - <br /> ------ ------- -aromatic Petroleum hydrocaibons(benzene,.ethyl benzene,toluene,and total xylenes; ----- ------- <br /> BTX&E). The samples will be collected from about S Fcet of depth and will b4 <br /> y: <br /> if:, <br />