ARCHIVED REPORTS_XR0003011 - Laserfiche WebLink

Home Browse Search

x » Ms Lori Duncan Project 20805-140 010 May 13, 1999 Page 2 (MW-6), and four vapor extraction wells (VW-1 through VW-4) (RESNA, June 26, 1992, Report No 30004-4, RESNA, June 21, 1993, Report No 30004-8, and RESNA, May 11, 1994, Report No 30004-8) The locations of soil borings, wells, and other site features are presented on Figure 2 Residual hydrocarbons were analytically identified in soil samples collected from the borings near the tank cavity Low concentrations of hydrocarbons were detected in soil samples collected from the borings near the dispenser islands During drilling of soil boring B-18, a product line was accidentally fractured and product leaked into the adjacent soil RESNA collected a soil sample from 6 feet below the product line (S-6-PL1), gasoline hydrocarbons were detected in this sample RESNA installed one vapor extraction well (VW-4) near the product release Total petroleum hydrocarbons as gasoline (TPHG), and benzene, toluene, ethylbenzene, and total xylenes (BTEX) were below laboratory detection limits in soil collected at 11 feet, 26 feet, and 46 feet below ground surface (bgs) RESNA began monitoring the groundwater in wells MW-1 through MW-4 on • October 30, 1991 (RESNA, June 26, 1991, Report No 30004-4) Wells MW-5 and MW- 6 were added to the monitoring program in March 1993 and December 1993, respectively Dissolved hydrocarbons have been detected in wells MW-1 and MW-5 since monitoring began Wells MW-2, MW-3, and MW-4 have intermittently contained low concentrations of TPHG and BTEX In March 1992, EA Engineering, Science and Technology (EA) observed removal of the oil-water separator/clarifier (EA, August 1992, Report No 80633 01) EA collected one soil sample from beneath the former oil-water separator and one sample from the concrete Analytical results from the soil samples indicated that oil and grease (quantified as total oil and grease [TOG]) were present Concentrations of volatile organic compounds, semivolatile organic compounds, and polychlorinated biphenyls (PCBs) were below detection limits Total metals were also below detection limits, with the exception of arsenic and barium, which were detected at concentrations of 0 0051 and 0 12 parts per million, respectively On March 2, 1992, RESNA conducted a vapor extraction test at the site (RESNA, June 15, 1992, Report No 30004-5) Results of the test indicated that soil beneath the site can be remediated by vapor extraction, and the evaluated radius of influence was 30 feet CP lE 1ARC010548\REP0RTS10548P201 DOC-981lsg 1 ;Vow{C& A-2