ARCHIVED REPORTS_XR0002919 - Laserfiche WebLink

Home Browse Search

. Ms Margaret Lagorio Project 880-040 1 August 29, 2002 Page 3 coordinated with the Blaine Tech Environmental who monitors the 76 Station east of the subject site Groundwater samples were analyzed for the presence of total petroleum hydrocarbons as gasoline (TPH-g), benzene, toluene, ethylbenzene, xylenes (BTEX), and for five gasoline oxygenates (MtBE, di-isopropy ether [DIPE], ethyl tert-butyl ether [ETBE], tert-amyl methyl ether [TAME] and tert-butyl alcohol [TBA]) using U S Environmental Protection Agency (EPA) Methods 8015 Modified, 602 and 8260B, respectively Field and laboratory procedures are presented as Attachment A Certified analytical reports, chain-of-custody documentation, and field data sheets are presented as Attachment B Third Quarter Groundwater Monitoring Results Depth to groundwater at the site has decreased approximately 10 foot since the previous sampling event conducted on April 23, 2002 During the third quarter groundwater flow was generally to the northeast at an average gradient of 0 002 ft/ft, which is consistent with the previous sampling events Groundwater elevation data are presented in Table 1 A groundwater elevation contour map based on the July 23, 2002 data is shown on Figure t TPH- was detected in wells MW-1 and MW-3 at concentrations of 10,000 micrograms g g per liter (µg/1), and 170 gg/1, respectively Benzene was detected in wells MW-1, MW-3 Y and MW-4 at concentrations of 850 gg/1, 0 39 gg/l and 1 1 gg/l, respectively MtBE was detected in all wells sampled at concentrations ranging between 300 µg/1 in MW-3, and 18,000 gg/1 in MW-5 TAME was detected in all wells sampled at concentrations ranging between 10 gg/1 in MW-3, and 160 gg/1 in MW-4 TBA was reported in wells MW-1, MW-2 and MW-5 at concentrations of 1,600 gg/l, 61 µg/1 and 5,700 gg/l, respectively Groundwater analytical data are presented in Table 1 A TPH-g, benzene, and MtBE concentration map based on the July 23, 2002 data is shown on Figure 2 Shaw Environmental&infrastructure,Inc SAC W 1sacDP120021PR11P18188018800401A tab doc-021ms 1 (01070000)