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San Joaquin County PHS/EHD <br /> December 27 , 1989 <br /> Work Plan Proposal <br /> Page 2 <br /> VIII . ESTIMATES OF LIQUID QUANTITY RELEASED: <br /> There is no known estimate of liquid quantity released at <br /> this point and no test data to indicate contamination <br /> exists. Some overspill has occurred prior to the <br /> overspill bucket being installed in April of 1988 which <br /> leads us to believe contamination may be present. <br /> IX. LOCAL TOPOGRAPHY: <br /> Refer to figure 1 for local topography. Depth to ground <br /> water at this location is below 100 feet as determined by <br /> the depth of water in our wells at the facility. <br /> X. HISTORY OF SITE AND TANK USE: <br /> RMC Lonestar took over control of this plant in January of <br /> 1987 , the site is used for mining and processing aggregate and <br /> for production and sales of paving asphalts. It is unknown <br /> when the tank was installed at this location and is being <br /> removed as part of RMC Lonestar's plan to upgrade this <br /> facility and remove equipment which is no longer essential for <br /> operation. <br /> XI . PROPOSED WORK PLAN: <br /> The amount and levels of contaminated soil which may be <br /> present from this tank are unknown. This plan is being <br /> submitted in order that RMC Lonestar may begin lZmedlate <br /> exca n , s ou i e necessary after <br /> the tank is removed, to prevent the possibility of having the <br /> pit remain open for an extended period of time. Should <br /> contamination levels indicate remediation of the soil is <br /> necessary, RMC Lonestar proposes the following work plan: <br /> RMC Lonestar proposes to hire the services of Pratt Consulting <br /> Company (PCC) to continue excavation of the diesel tank pit <br /> where any contamination is found. A Photovac 1OS50 , which is <br /> capable of detecting petroleum constituents to parts per <br /> million, will be utilized, under the direction of Dr. Lew <br /> Schalit Ph.D. , for the initial analysis of the soil . After <br /> PCC has determined the extent of contamination PCC will take <br /> soil samples from the pit and send them to a state certified <br /> laboratory for analysis using chain of custody. No less than <br /> four samples shall be taken from each wall and floor of the <br /> pit. Each of these set of four samples will be composited <br />