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t <br /> L <br /> l <br /> p 23 September 1997 <br /> AGE-NC Project No 95-0184 <br /> Page 6 of 8 <br />' per liter, equivalent to parts per billion, ppb) Benzene was detected at concentrations as high as <br /> 44,000 ppb TPH-d was detected in the sample from MW-4 at a'concentration of 4,100 ppb <br /> Chloroform, 1,2-dichloroethane and di-isopropyl ether (DIPS) were detected in the sample from <br />' - r MW-3 at concentrations of 7 7 ppb, 21 ppb and 9 7 ppb, respectively 1,2-Dichloroethane was <br /> detected in the sample from VW-213 at a concentration of 2,500 ppb Analytical results are <br /> summarized on Tables 2 and 3 The laboratory report(MAI sample Nos 79090-79099)and chain-of- <br /> custody form are included in Appendix B - <br />' 43 SOIL PROFILE <br /> r <br /> Primanly silty clay and clayey silt were encountered during drilling Silty fine sand was encountered <br />' from approximately 14 feet to 20 feet in borings VW-2 through VW-5 Thinner intervals of silty <br /> sand were encountered in boring MW-7 at 40 feet and 60 feet bsg and in boring VW-1 at 50 feet bsg <br />' Description of soils encountered in each boring are included in the boring logs in Appendix C <br /> 44 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> i <br /> Organic vapor was detected in each boring at concentrations as high as 1,698 ppm(VW-2 at 30 feet) <br />' Organic vapor was detected beginning at a depth of 15 feet bsg in boring VW-5 Organic vapor was <br /> not detected between surface grade and 25 to 40 feet bsg in borings VW-1 through VW-4 and MW- <br /> 7 <br />' Petroleum hydrocarbons were detected in each boring at concentrations as high as 23,000 mg/kg <br /> (milligrams per kilogram,equivalent to parts per million, ppm, VW5 at,I5 feet ) Analytical results <br />' are summarized on Table 4� The laboratory report (MAI sample Nos 61877-61893) and chain-of- <br /> custody <br /> hain-ofcustody form are included in Appendix D <br />' Sample VW3-40 and VW5-30 were analyzed for bioenumeration and physicochemical properties <br /> Very low populations of both-general and selective microbial populations were observed Nitrogen <br />' concentrations were below optimal for biodegradation of hydrocarbons The laboratory report <br /> (Kaufman March 4, 1996), including a discussion of the findings, and chain-of-custody form are <br /> included in Appendix D <br /> 5.0. SUMMARY AND CONCLUSIONS <br />' Based upon data collected from the site, AGE concludes the following <br /> Advanced GeoEn4ironmenial,Inc <br />