ARCHIVED REPORTS_XR0006084 - Laserfiche WebLink

Home Browse Search

Ile , 08 August 2005 AGE-NC Project No 98-0534 - ' Page 5 of 15 s ' A total of ten"grab"water samples were collected on the site Each sample was analyzed for TPH-g, TPH-d and BTEX, with analysis for MTBE, and each sample was analyzed for the suite of five fuel additives TPH-g was detected in seven of the ten "grab" ground water ' samples collected from the site at concentrations ranging from 74 µg/1 (P 1) to 11,000 Pg/l (P3) TPH-d was detected in all of grab ground water samples analyzed at concentrations ranging from 450 µg/1 to , µg11 4776-0 �jL/ab Benzene was detect din two of the water samples analyzed at concentrations as high as 3 1 pg/1 in sample Plater Toluene was detected In S,9N*n of the water samples analyzed ' at concentrations up to 16 µg/1 in sample P7-water Other BTEX compounds were also detected at concentrations as high as 1,100 µg/1 (xylenes In P3-water) MTBE (by EPA Method 8020) was detected in§i,5t of the water samples analyzed at concentrations ranging ' from 6 3 µg/1 in sample P8-watcr to 1,200 µg/1 In sample P9-water MTBE,ETBE and TBA were detected by EPA Method 8260 Modified in nine of the water samples analyzed at a maximum concentration of 1,600 µg/1 in sample P9-water(MTBE) The analytical results of the soil and ground water samples are summarized In Tables 1, 2 yt �' p . and 4 Field procedures and sample results for the June 1999 excavation were reported in Preliminary Investigation and Evaluation Report, dated 18 April 2000, prepared by AGE Y 20 and 21 July 2000, eight pilot borings were advanced to 30 feet bsg and completed as monitoring wells (MW-1 through MW-8) utilizing 2-inch diameter PVC well casing As- built monitoring well diagrams for MW-1 through MW-8 are shown on Figure 3,boring logs ' for wells are included with Appendix A Discrete soil samples were collected at 5-foot intervals, beginning at 5 feet bsg,to total depth of each boring with the exclusion of MW6 In boring MW6, soil samples were collected at two foot intervals, starting at 10 feet bsg ' A total of twenty soil samples were submitted to MAI for analysis of TPH-g,TPH-d,BTEX, nfa MTBE,ETBE, TAME,DIPE,TBA, 1,2-DCA and EDB None of the above mentioned fuel components were detected by laboratory analysis The analytical results of selected soil samples are summarized in Tables 1 and 2 Results of the July 2000 investigation were ► ' E reported in Quarterly Report-3rd Quarter 2000, dated 09 October 2000,prepared by AGE A MW6. ' 02 August 2000 - the casing elevation of each installed well was surveyed to the nearest V7V_ 0 01-foot, relative to well MW-1 assigned a relative, arbitrary elevation of 5 00 feet Initial ' ground water levels measured at MW-1 through MW-8 averaged 10 38 feet below the tops of the well casings, ground water was inferred to be flowing to the south and southwest with a nearly flat hydraulic gradient of 0 003 foot/foot (ft/ft) TPH-g was not detected ina a IL the ground water samples TPH-d was only detected in samplesprEN- 4 and MW-6 atR110 Vrn 1 µg/1 and 82 pg/l,respectively Ofthe BTEX compounds,only toluene was detected in sample y/4(ob MW-4 at 0 63µg/1 MTBE was detected in samples MW-3, MW-4, MW-6 and MW-7 at ' Advanced GeoEnvironmental,Inc