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J.H.RLEINFELDER&ASSOCIATES <br /> res Ming Lha ,,Dora emitted from the soil. The PID measutotal _ <br /> 1 a <br /> an <br /> gable ompam. in af, in par cs pe[ million by volwnclmw)11 <br /> relation to a ealect at 4,rd. The standard used for this invascigatien <br /> was a 29 ppm benrene calibration gaa. Calihratlon wee performed prior to <br /> In the field. Volatile concentrations were deteoted free two of the <br /> I1 sailsamples collected from sail boring .-l. Soil sample S-8102, <br /> eellected at a depth of 14 feet,had a PID reedit&of 296 pp=,and sample <br /> t S-Elul,collected at a depth It 19 feet,had a PID reading,t 896 ppmv. <br /> j <br /> Ae a 1­10. end safety precaution ter Lhe fieldw <br /> cr , the BID was ala, <br /> used meas to the total volatile c n centrations In the 4renthing e - <br /> prior to andJrdurins the drilling ofthe soil borings. Na wl-11a <br /> •j conoentralions,—r.detected abavo 1 ppmv in the breathing rens. <br /> 4d F <br /> it + <br /> 4.4 mlINSrALIATIDR, <br /> A vapor exkra { well(EF-1)and three piezometer we12e (P-1,p-d,P-]) <br /> were constructed in the four soil baring,at the completion of drilling <br /> E; and logging of h oil boring. The ,spat....... <br /> xtras tion wall and the <br /> 1 p[eroma ter ,all constructed in Lhe sass anner, to the <br /> specifimatfons. Construet[on details of,the vapor extraction well and the <br /> 1� Irr1l pictometer walls ora shown an Plates and 5. <br /> Tho wall, vers completed with Faur Ind,inside diameter, Eluah-[hread,d - <br /> 1j <br /> joi t schedule- 4D PVC pip Tefl,n tape was used to B 1 all j i c, <br /> reduce tie pot ti 1 fur air leakage. Well cti... to + <br /> ' <br /> yerfarat,d.with'0 920-inch t tory-tut slot,. Th d ea tion MOI i <br /> 'set f— approximately to to 15 feet below the ground surface. The <br /> Beriaraced eeetion w a set above the ground water table. The PVC pipe was. +i <br /> ste_.I.enod prior to installation Ta form a sand pack, the annular <br /> .i } space.between the pipe and the well of the horin8 was backfilled with <br /> {� clean lona SLex Industries /7 nont.ray. sand to,pprwmimataly two feet <br /> dboye the'top of the perfoxa t¢d eco Cleo. A three-foot h--ft,plug was <br /> placed above the gond pack t provide ,eel against surface water <br /> U infiltca tis., The remaining annular <br /> ut a fiL led with cement grout to _ <br /> 29-789 .. '7 <br /> +1 <br />