ARCHIVED REPORTS_XR0007087 - Laserfiche WebLink

Home Browse Search

1 The results of the Iaboratory analysis indicate that the soil samples collected from MW-I contain TPHg concentrations of 3 4, 680 and 1 6 ppm at depths of 36, 46 and 101 feet bgs respectively Soil boring samples generated from MW-2 through MW-4 submitted to the laboratory for TPHg analysis had concentrations <1 0 ppm for all depths analyzed Soil samples analyzed from MW- 5 (SB-11) contain TPHg concentrations <0 005 ppm (or not detected) for all depths analyzed ' Benzene was detected in soil samples collected from MW-1 with a maximum concentration of 0 036 ppm at 83 feet bgs A maximum concentration of 0 011 ppm for benzene was detected in ' MW-2 at 46 feet bgs and 0 006 ppm at 71 5 feet bgs for SB-I I MW-3 and MW-4 had benzene concentrations <0 005 ppm for all depths analyzed The laboratory analytical reports and chain- of-custody forms for the soil analyses are included in Appendix C The soil results are summarized in Table 3 42 Groundwater ' Depth to groundwater at the site ranged between 75 96 and 86 92 feet bgs Groundwater elevations at the site are referenced to an assumed 100 foot elevation (Table 2) The groundwater flows in a southeastern direction with a hydraulic gradient of 0 13 ft/ft ' A groundwater sample from each monitor well was analyzed for TPHg by EPA Method 602 and ' BTEX by modified EPA Method 8015 The results of the laboratory analysis indicated TPHg in MW-1 (5,200 ppb), MW-2 (460 ppb), MW-3 (430 ppb) and MW-4 (100 ppb) Toluene was ' detected in the various wells at concentrations ranging from<0 5 to 1,100 ppb, benzene ranging from 2 3 ppb to 200 ppb, ethylbenzene ranging from <0 5 ppb to 160 ppb and total xylenes ranging from 0 6 ppb to 620 ppb The groundwater laboratory analysis results are summarized in �I 1 Table 3 Copies of the laboratory analytical reports and chain-of-custody forms are included in Appendix C i lob N,, NUN0)01 /11 SF C(1R 1