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M2 <br /> ,..a'.. � a�w 'a"�1rx;�,_ <br /> a ,,roc "mrRa <br /> s ! c��u��± ti;lniticant contontrAtlung Of TP11 vnrer faatns# In sol# 3t <br /> rlot,tha rrt up to 31 "Ot b*10v VrOund ourfaca, anri 1rracauco tc'0 <br /> vAi+ l table van ro than 33 taut 6'01Cry Oround curfnco, 111-41to <br /> rOMtdiatIon of thea hydrocarbon contaminat�l coil was ro1ortcd for <br /> thin aito. During tho veek of 7 ltovambor 19Bo, flvu mall vapor <br /> extracLlor► vR110 tVt-'.tS, F"Ure 2# vera lac.alled ih and 4roun€1 <br /> the former tank field (Fl9ors 2) for the purpose of onalte, in- <br /> #=1sce oxtrActlon And trlS4eft4pt Of c0titaminatod coil qjr., vith the <br /> ultimata goal. of uignificantly reducing the hydre*.ar bon conc*n- <br /> tr,atlona in the coil. T1:04o tivo v,111n were ocrooned bolow the+ <br /> tank excavation backfill (about 15 feet dopth# to a total cl�rpth <br /> of afafart►xsr Moly 34 toot. The toil boring logo and the vall <br /> co:srlotlon diaclranc for the five vapor extraction wallet aro <br /> included 4►o Appandix A. <br /> On .S April 1909' pilot-cealo touting LO datermino docIgn para- <br /> Mara for A vapor extraction syctam at the alto vat snit€atad by <br /> EA. A vacuum compreguor Capable of pumping 30 cubic toot per <br /> OlAutc (Cim) was attached to vapor extraction valla V2, V4, and <br /> VS, 311 located outside the baekfillod tank excavation. Sa#plas <br /> Of th* vacuum discharge wore collected and analyrad onsite using <br /> 1rA'a nobilo HIM qac chrom*tograph. Vapor comples fro= V2 Can- <br /> talned up to 4,500 pp2l total petroleum hydrocarbons tTPft#1 V4 <br /> Contained TP11 in concentratlona ranging from 40,000 to 63,500 <br /> tepns and aetaples fry VS averaged Approximately 16,000 Pia TP#t. <br /> In additicn to vapor concentration c4acuror-ontea, the vapor trans- <br /> nisaiv,lty of the soil was tasted the same day. To that and, coil <br /> vapor probes gore dr#van to d+aptha of approxia,toly <br /> 15 teat and <br /> 25 .feat below ground surface at 5 and 10 foot from yell V3 in the <br /> direction of well V4. Thaw probes were slatted the bottea six <br /> Inches of length and equips on the aurfacOvith aenatttva <br /> 9neh0lic gaugst to sraaaura vscvuem pressure in the soli <br /> resulting frame the Vacuum appl.tead to veil Vl. in addition,, a <br /> gnehelic gauge rat cortnerctad to well V#, 22 feet from the veil <br /> Vl. A VACuuX llov of about 23 to 30 rift vas then agplled to veil <br /> C52/919111/taut <br />