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M <br /> d :A �. ,3 3z—Yr;%. ° <br /> r k" <br /> . •_s, .l'�� xy -. � X � Y_: ,�' t^ <br /> 1 gpni should be <br /> recovery well and with a recovery rate of <br /> sufficient to capture the onsite hydrocarbon plume in less <br /> than 2 years, If a higher pumping rateis <br /> used, <br /> t heground <br /> hydrocarbon plume that appears to be present <br /> water beneath the Exxon site swell. Fd be iguresa4rand r5rshow the <br /> Boulevard toward the recovery <br /> FLOWPATH predicted TPHtG-ea <br /> ndoi3"a'EXfis°G°ncentrationgmagsgford <br /> on the August <br /> the site. Appendix B presents the results of the FLOWPAT <br /> sis, indicating the projected capture zone <br /> computer eaalof pumping as well as the hydraulic head <br /> after 1 y athlines for a pumping <br /> distribution and ground water flow p <br /> rate of 1 gPm- <br /> 5.0 pROpOSED REMEDIAL WORK PLAN <br /> Based on the previous work completed o dahydboc It on <br /> on <br /> Geoscience, it is apparent that petroleum <br /> constituents have impacted the ground waterpatthe sbe <br /> ite, <br /> ear while remediation of onsite sail does not a p <br /> warranted. This remedial work plan therefore <br /> water oonsite. <br /> only <br /> the hydrocarbon constituents in the ground <br /> A recovery/treatmenalsystem illration afefree�floatinq and alled to Ver and <br /> control the potential petroleum products in ground water ons3. <br /> disssystem will P <br /> hase <br /> The system will be designed fromto xthecgroundt the iwateriasewell as <br /> hydrocarbons (free product) round water. The <br /> treat dissolved-phase constituents in the grwell ound <br /> nrt Mwith <br /> recovery yswillconsist <br /> Oftoextracgroundwater and <br /> an air-displacementped <br /> roximately 1 gpm or less. This pumping <br /> free product at app capture free-product as well as <br /> rate will be sufficient to Cap the potential <br /> we <br /> recover the onsite plume while preventing lae the <br /> migration of the crossgradient hydrocarbon p <br /> beneath the Exxon Property towards the former <br /> ground watt-Ir <br /> mobil recovery rate will be adjusted accordingly <br /> obil site. Tthe hydrocarbon constituents in the ground water beneath <br /> if <br /> and in the vicinity <br /> recoverthe <br /> Exxon site is determined to be <br /> affected by the <br /> The product-water mixture will be pumped to re oil/water <br /> separator with the floating product transferred to a storage <br /> tank for later recycling or disposal to an approved facility. <br /> The underfloor will be pumped through an activated carbon <br /> adsorption system prior to discharging -to the storm sewer. <br /> adsorption of the proposed system is shown in Figure 6 <br /> _; 7 <br />