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M <br /> n Manna Pro Corp. = 3 - 4,August 16,.2011 <br /> �o <br /> Remediation Summary tL;{+ r , <br /> •�' Free Product: No free product was documented throughout the life'of this case. <br /> •' Soil Excavation: Ari estimated 4;000 cubic yards of impacted soil were"removed and -T 't' <br /> disposed offsite in 1990. Consultant estimates 1,543'pounds of TPHd and;55 pounds of <br /> TPHg were removed by excavation.` i. `' �` ° a=► <br /> + r In=Situ Soil/ Groundwater Remediation: Soil.vapor extraction and air sparging,-'. <br /> conducted from September 2003 through present, has removed approximately <br /> 15,000 pounds of TPHg. In''April 2009, the rate of removal was less than 1 pound+of ,a <br /> TPHg/day. °; �, . ' .. " i ... l . . <br /> F i y <br /> General Site Conditions <br /> • Geology and Hydro'geologyJ The Site is underlain by intermixed sand, silt and clay. The <br /> depth to groundwater varies seasonally between 23 to 31 feet,bgs and -the groundwater <br /> E gradient is northerly at apprgximately 0.0012 feetlfoot. <br /> • 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;. <br /> BENZENE Results for MW-7 <br /> I. 30000-1i <br /> E! <br /> 20000 A <br /> {. zlsnovjR'` ILI \ ' <br /> r� �4 5000 <br /> , <br /> SII ' r -BENZENE — <br /> y] F I <br /> �{ BENZENE Results for MW-6 <br /> WDO <br /> 13 I <br /> � 3000 <br /> w2000 <br /> 3 , <br /> - d 1500o <br /> 11:elf.m - ..-- -•t -"--e _ , - `.. <br /> Sao <br /> r01 <br /> 'I I BENZENE -r Md ! " f <br /> Risk Evaluation <br /> As a result of removal of approximately 1,600 pounds of TPH by excavation and 15,400 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 WQG. The;'Site is currently a lumber <br /> yard with;no nearby enclosed buildings, and there is little potential for,hydrocarbon vapors to l <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. 4 <br /> A III`5 <br /> � F <br />