ARCHIVED REPORTS_XR0007549 - Laserfiche WebLink

Home Browse Search

I ' 24 January 2003 AGE-NC Project No 99-0657 ' Page 5 of 7 I A reddish-brown clayey fine to coarse sand was encountered from approximately 20 feet to 30 feet bsg Brownish-gray silty fine to medium sand was encountered from approximately 40 feet bsg to the total depth of the borings, Inter-beded with this sand were laterally discontinuous thin layers of ' brown clay in the areas of borings MW7 and MW8, a thick layer of brown coarse sand in the area of boring MW8, a thin layer of tan coarse sand in the area of boring MW5 and a thin layer of gravelly clayey sand was encountered In the area of boring MW6 IOrganic vapor was detected in the soil samples collected at a maximum concentration of 10 parts per million(ppm)in soil sample MW5-35 No hydrocarbon-like odor was detected in any of the soil samples taken Lines of cross section are Illustrated on Figure 2 and stratigraphic cross sections are depicted in Figures 7 and 8 The soil boring logs are provided in Appendix B, organic vapor field measurements are included on the boring logs I 32 ANALYTICAL RESULTS OF SOIL SAMPLES A total of 20 soil samples were analyzed for the constituents listed in section 2 4 no p Y � analytes were detected at or above laboratory reporting limits in the soil samples Analytical results of soil samples are summarized on Table 2 The laboratory reports (CTEL Lab I Project No CT214-0210025), quality assurance and quality control (QA/QC)report and chain-of- custody hain-ofcustody forms are included in Appendix F I3 3 GROUND WATER GRADIENT AND FLOW DIRECTION At the time of the October 2002 sampling event, depths to ground water ranged from 34 28 feet to 36 38 feet below the tops of the well casings Ground water elevations at the site ranged from 5 77 feet above mean sea level(MSL)in well MW6 to 6 44 feet above MSL in well MW2(Table 1) During this monitoring event, the ground water levels in the wells were at least five feet below the tops of the well screens, indicating that the wells are screened properly to yield representative shallow ground water samples The ground water elevation at the site remained fairly stable with a nominal average increase of 0 08 feet between the July 2002 and October 2002 monitoring events Ground water flow was inferred to be radially outward, ranging between a southwesterly flow Idirection on the west side of the site to a southeasterly direction on the east side of the site, the average ground water gradient was 0 005 feet/feet Figure 3 illustrates the contoured ground water Ielevations as measured on 04 October 2002 Advanced GeoEnvironmental,Inc