ARCHIVED REPORTS XR0009171 - Laserfiche WebLink

Home Browse Search

' 02 February 2000 AGE-NC Project No 97-0301 Page 6of7 analysis The analytical results of selected soil samples are summarized in Table 1 The laboratory reports(Castle Analytical Laboratory Reference No 2678 and McCampbell Analytical Inc Lab I D No 27874 through 27883) and chain-of-custody forms are included in Appendix D 3 5 ANALYTICAL RESULTS OF GROUND WATER SAMPLES ' Four ground water monitoring well samples were submitted to a DHS-certified laboratory in December 1999 TPH-g was detected in ground water samples collected from well MW-1 at a ' concentration of 47,000 micrograms per liter(µg11), TPH-d was detected in ground water samples collected from wells MW-1,MW-2 and MW-4 at concentrations ranging as high as 3,5 00µg/l,TPH- k was detected in ground water samples collected from wells MW-1 and MW-4 at concentrations ' of 12,000 and 62µg11, respectively BTEX compounds were detected in ground water samples collected from wells MW-1 and MW-4 ' at concentration ranging as high as 6,400 4g11, however, MTBE, DIPE, TBA, ETBE and TAME were not detected during laboratory analysis of the ground water samples • The analytical results of quarterly ground water samples are summarized in Table 3 The laboratory reports(Castle Analytical Laboratory Reference No 2701 and McCampbell Analytical Inc Lab I D No 28187 through 28190) and chain-of-custody forms are included in Appendix E 4.0. SUMMARY AND CONCLUSIONS The following conclusions were drawn from the results of this investigation ' - Saturated soil at the site was encountered at approximately 40 feet bsg The static water level was measured at approximately 30 feet below the tops of monitoring well casings ' - The prevailing ground water flow direction at the site is towards the east at a gradient of 0 003 - The lithology underlying the site is dominated by sandy silt and silty sand A poorly graded fine to medium sand layer was encountered from 25 feet to 30 feet and from 50 feet to 55 feet bsg A silty clay layer was encountered at 60 feet bsg - Ground water monitonng wells MW-1, MW-2, MW-3 and MW-4 are"properly screened" and should yield samples representative of shallow ground water conditions ' - The most intensely hydrocarbon-impacted soil was encountered in the area near the former . USTs and dispenser(MW-1) Soil contaminated with petroleum-hydrocarbons was limited ! Advanced GeaEnviranmental,Inc