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site History <br /> T Me C)"P aPerty Na 04-049' GA <br /> 1 Advancing 4 borings to a depth of 40 feet (or to 10 fee <br /> 2 Callecting sort Samples based an visual metes from each bo Past any Indications of coria <br /> obsa?Iyatian and field I�9 at 5-foot trite mrnatron} <br /> 3 Installing rumentation re reals and Submitting <br /> 9 two 2-inch diameter v adrngs 9 therm for anal <br /> apor extraction inlet yses <br /> Authorization to proceed with the assessment wells use in <br /> a future remediation system <br /> nt was received from the PHS/f<Hp on November <br /> 7-6'anal Soil lnvestI <br /> On becember atron - Dece 26, 1sg3 <br /> 2 and 3, ?993, tuber 1993 <br /> vaPor extraction wells in the vrcimobite drit! ri <br /> consist of fine silt 9 was used to advance three soil Bonn s <br /> strata Y sands, sand Y of the for <br /> Y sifts mer tank system punn <br /> vy a underlain by fine to or cls g held 9 and install two <br /> generally encountered coarse YeY silts to approxi aCtrvrtreS, <br /> the extent of the borings <br /> 30 feet to Sands to aPpro 15 feet below sorts were found to <br /> orings Groundwater was while a depth of aPAroximatet ground surfac <br /> fine to coarse sands y 30 feet e, this <br /> Barings SB-6 and SB_ not encountered duan wefe encountered from 35 silt <br /> was <br /> advanced to 56 7 were advanced to 9 field activitiesfeet <br /> to <br /> With 2-Inch feet 5 feet Watts a depth of 41 5 <br /> depth of 25 meter PVC W-7 and W_g Were installed !fleet below ground <br /> feet below casing and 0 020 Inch a total de surface, <br /> ground surface to the extent slotted well screen depth of 56 6 while 56-9 was <br /> Based on nt of the Soth wells feet, and constructed <br /> Submitted to rsauat Inspection and we were screened from <br /> anal laboratory field in Its <br /> 3 to m $ <br /> analyzed for total and ED@ zed for rume 4 Sall samples <br /> concentrations lead and 9 and STEX Ales from <br /> PAM at 45 feet of rp 9, with the exce�one sort samples One SamAle from each ash baring were <br /> }-l- of the <br /> Xylenes , and 1,700 ppm of SS feet) <br /> of those Ales were fou h boring was <br /> Of 13T (up to 7t?D ppm) were Toluene colJected from found to contain also <br /> EX and total lead also present in the s3muP to 120 W-g f7,900 PPM at 2g feetactable <br /> however, these were Peed o Ylbenzene , 1,400 <br /> of the Samples did nota Present in severs! SamplesSamples collected from VV-8 (up to 110 <br /> mples appear to be Present at cancan ato collected from S $ Residual co PPM), and <br /> ns of concern 13-7, W-7 S ncea�ttrations <br /> copy of S <br /> ECOR s EDB was not rand sated In an <br /> appropriate regulatory and y <br /> a reed gulatory a enGles Site Assessment Report <br /> 9 with the Ponclusro on June 22 dated <br /> soil borings and/or va ns of the re 7994 In their reply"lune 14, 1994, was fa <br /> Por extraction Port and requested that a dated July 7 rhe PH to the <br /> n wefts be submitted Work [a the instal9jaon of P <br /> P n far HS/EHD <br /> rk 1 n for Additional additional <br /> Based sort Invests atron <br /> hydrocarbonhm data coilectel Au ust 7994 <br /> southwest Pacted during previous Inv <br /> (bY SB- soil had been asti9ations <br /> It was not defined to W 7} s°uth defined to the northwest It appeared <br /> (by W-6 that the lateral extent of <br /> Environmental Invests north and northeast?, and east (by W 5 and <br /> Proposed these 9atian" Was On August B-�} of the former tank), west (by 88_4) <br /> actrwtieS forwarded td the 1994, SECO system However' <br /> 1 approPrrate regulato R s "Workplan for Addit ona! <br /> Three borings would be rY agencies <br /> contamination} advanced to The workplan <br /> a depth of 55 feet (or to 10 <br /> feet past any indications of <br /> 3 <br />