ARCHIVED REPORTS XR0007969 - Laserfiche WebLink

Home Browse Search

' 16 December 2002 AGE-NC Project No 97-0300 ' Page 3 of 8 ' 4.0. SITE INVESTIGATIONS Based on analytical results of soil samples collected during the UST removals, a preliminary site ' investigation was required by the SJCEHD by letter dated 03 June 1999 (Appendix B) prior to obtaining a site closure for the former USTs.The following is a brief summary of the site assessment Investigations conducted at the site to date ' 31 August 1999 - Six soil borings (P-1 through P-6) were advanced at the site, soil boring P-3 was advanced vertically to a depth of 35 feet bsg, P-1, P-2, P-4, P-5 and P-6 were ' advanced to 30 feet bsg (See Figure 2), boring logs for P-1 through P-6 are Included with Appendix C Soil samples were collected at 5-foot intervals,beginning at 5 feet bsg, to total depth of each boring Total petroleum hydrocarbons quantified as gasoline (TPH-g) was ' detected in sof 1 samples collected from borings P-1, P-3 and P-4 at concentrations as high as 60 mg/kg, TPH-d was detected in the same borings at concentrations as high as 110 mg/kg 1BTEX compounds were detected in soil samples collected from P-3 and P-4 at ' concentrations as high as 4 4 mg/kg,1vlTBE was detected in soil samples collected from P-1, P-3,P-4 and P-5 at concentrations as high as 39 mg/kg dnnalytical results of soil samples are summarized in Table 2 -Field procedures and sample results were outlined in Preliminary 10 Investigation and Evaluation Report, dated 11 November 1999 • 05 and 06 June 2000- One soil boring (P-7) was advanced to 65 feet bsg and three ground I water monitoring wells (MW-1, MW-2 and MW-3) were installed at the site to maximum depths of 60 feet bsg utilizing 2-inch diameter PVC well casing (See Figure 2) As-built monitoring well diagrams for MW-1,MW-2 and MW-3 are depicted on Figures 3, 4 and 5, respectively,boring logs for P-7, MW-1, MW-2 and MW-3 are included with Appendix C Soil samples were collected at 5-foot intervals,beginning at 5 feet bsg,to total depth of each boring A total of seventeen soil samples were submitted to a DHS-certified laboratory for analysis of TPH-g,TPH-d,BTEX and fuel oxygenated compounds(MTBE,ETBE,TAME, DIPE, TBA, 1,2-DCA, EDB, methanol and ethanol) None of the above mentioned fuel components were detected by laboratory analysis The analytical results of selected soil Isamples are summarized in Table 2 Results of the June 2000 investigation were reported in Quarterly Report- 2"d Quarter 2000, dated 04 August 2000, prepared by AGE • 16 June 200,0Initial ground water levels were measured at wells MW-1,MW-2 and MW-3 between 39`and 42 feet below the tops of the well casings,ground water flow direction at the site was inferred to be flowing towards the southeast at an approximate gradient of 0 01 ftlft TPH-d and MTBE were detected in the water/sample collected from well MW-1 at concentrations of 68 p.g/l and 2 gg/l, respectively No other petroleum hydrocarbon or fuel oxygenated compounds were detected during the laboratory analysis Ground water elevations are summarized In Table 3, analytical results of ground water samples are . summarizedin Tables 4 and 5 Results of the June 2000 groundwater monitoring event were reported in Quarterly Report-2nd Quarter 2000, dated 04 August 2000 prepared by AGE I Advanced GcoEnvironmental,Inc f