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Manna Pro Corp. <br /> - 3 -. August 16, 2011 <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case. <br /> • Soil Excavation: An estimated 4,000 cubic yards of impacted soil were removed and <br /> nsultant estimates 1,543 pounds of TPHd and 55 pounds of <br /> disposed offsite m 1990. Co P , <br /> . T.PHg were removed by excavation. ! !p t <br /> • <br /> In-Situ Soil/ Groundwater Rlemediation: Soil vapor extraction and air sparging, - <br /> conducted from September.i2003 through present, has removed approximately <br /> 15,000 pounds of TPHg. In April 2009, the rate of removal was less than 1 pound of <br /> 'I TPHglday. <br /> General Site Conditions m . <br /> Geology and Hydrogeology: The Site is underlain by intermixed sand,silt and clay. The <br /> 4 depth to groundwater varies seasonally between 23 to 31 feet bgs`and the groundwater <br /> gradient is northerly at approximately 0.0012 feet/foot. <br /> 1 • Groundwater Trends: There are more than 19 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, near down gradient (MW-1) and far down <br /> gradient (MW-6) <br /> b4E _ <br /> E� t} 1 BENZENE Results for MW-1 „ p <br /> .+ <br /> 30000 <br /> 250001E <br /> f si - ..20000 <br /> 011 <br /> I __,....... <br /> _-1 <br /> gyp !I <br /> SOOO�I <br /> 4171 <br /> q�v <br /> i <br /> BENZENE Results for MW-6 I <br /> 3500 .Ijli <br /> 3000 "'^ � •-^—'i��� <br /> 7000 ... ..._._.:_ } _.,.... -._. ............ <br /> of <br /> h <br /> f t 5a0 <br /> C. 1000 <br /> 0 ..r <br /> 'Ilet <br /> I w•.w.BENZENE ..TrenA.� - r. - <br /> { <br /> { <br /> Risk Evaluation <br /> a As a result of removal of approximately 1,600 pounds of TPH by excavation and 15,000 pounds <br /> of TPH'by soil vapor extraction, there is little residual petroleum hydrocarbon in soil at the Site <br /> that would pose a threat to groundwater resources, human health, or the environment. <br /> Constituents of concern in the source area remain above WQO. The Site is currently a lumber <br /> yard with no nearby enclosed buildings, and there is little potential for hydrocarbon vapors to <br /> migrate-or pose a threat to human'�health or the environment. There are no water supply wells <br /> or surface water receptors present within 1,,700 feet of the Site. <br />