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Invitation to Bid. Hartmann do Setneu <br /> Stockton plating,Incorporated <br /> 632 South El Dorado Street <br /> Stockton,CA 95203-3407 <br /> Page 3 <br /> penetrations will be accomplished, one to each of the former tank. locations�thdraNxmand one <br /> approximately midway between. Begmrung at 10 feet BGS, soil samples <br /> wilevery 5 feet and sent for laboratory analyses for <br /> Total Petroleum Hydrocarbons as gasoline (TPHg) by Cal-DOHS Method, <br /> Tetraethyl Lead, <br /> Total Lead <br /> s <br /> Location und*r D awning JAW-4 <br /> O <br /> MW-3 <br /> r <br /> . ° TKI-90 I, <br /> I TKI-86 <br /> 0 X° O O i <br /> _ — —p—X—z <br /> x Solt sampung Only O <br /> to collect Pb conflrrnstlons <br /> 0 Son vapor sampling followed MW-2 <br /> by son confirrnatlon samples at discreet depths <br /> Figure.1. Lead Confirmation and Fuel Hydrocarbon Plume Deltneatton Test Locations <br /> The strategic reasons for this technical approach are as follows <br /> the three sampling runs will provide spatially similar data at each potential source (TKI-86 <br /> and TKI-90) from just below the probable former location of the tank inverts all the way to <br /> the water table surface TPHg samples will provide simple proof as to which potential source <br /> is the major or sole contributor The intermediate location will serve to provide a check as to <br /> spatial occurrence of TEL and TPHg with respect to the two tank, locations, <br /> iTEL analyses will provide essentially incontrovertible proof(assuming that only leaded and <br /> unleaded were used in TKI-86 and TKI-90, respectively) as to whether or not the fuel plume <br /> came from one potential source or the other, <br />