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CONESTOGA-ROVERSCEIVEL <br /> &ASSOCIATES <br /> 1 20 - <br /> 110 <br /> July 16,2010W <br /> ��TbT1 F1 <br /> -2- PERMIT/SERVICE <br /> Historical. Most Recent <br /> COPC Maximum Maximum SFB-RWQCB <br /> Concentration Concentration Commercial ESL(a) . <br /> (AWL) <br /> TPH --490,000. 3,900 NA <br /> g (MW-4;11/22/93) (MW-2;5/24/10) <br /> 27,0 37 <br /> Benzene (MW 1/3/91) (MM-9;5/24/10) 1;800 <br /> 27,000 2.6 <br /> Toluene - (MW-9;10/30/91) (MW-9;5/24/10) 530,000 - <br /> 4,700 3.3 <br /> Ethylbenzene - (MW-9;2/10/93) (MW-9;.5/24/10) 170,000 <br /> ' 36,000 9.1 <br /> Xylenes (MW-9;2/10/93) _ (MW-9;5/24/10) 160,000 <br /> 23,000 10 <br /> MTBE (MW-8;11/3/03) (MW-9;5/24/10) 80,000 <br /> 7,300 130 <br /> TBA _(MW-8;11/3/03) (MW-9;5/24/10) NA. <br /> Notes: <br /> (a)Table E-1"Groundwater Screening Levels for Evaluation of Potential Vapor Intrusion Concerns' <br /> 1§4L=micrograms per liter - <br /> ND=Not detected above laboratory detection limit- <br /> NA=.No ESL provided <br /> The only.constituent in groundwater that has previously exceeded the Tier 1 ESLs for vapor <br /> intrusion is benzene. This benzene detection,however,-is nearly 20 years old. The most current <br /> concentrations detected at the site are well below the ESL for this constituent. <br /> There are currently no ESLs for risks of vapor intrusion from COPC impacted soil. The highest <br /> COPC in soil are presented in the table below. A complete table of soffresults is attached. <br /> -- Worldwide Engineering,Environmental.Construction,and IT Services <br />