ARCHIVED REPORTS_XR0008889 - Laserfiche WebLink

Home Browse Search

FARR ASSOCIATES 3 3 1 Groundwater Monitoring Wells and Soil Borings After removal of the underground storage tanks, a number of soil borings and monitoring wells were installed to further assess the impact of potential releases from the underground storage tanks at the Site In January of 1992, borings B-1 and MW-1 were drilled and MW-1 was completed as a monitoring well (Appendix B contains logs for all borings installed at the Site) In June of 1993, WHF Environmental Consultants installed three additional groundwater monitoring wells (MW-2 through MW-4) The wells were drilled to depths of 80 feet below ground surface (bgs), and groundwater was encountered at approximately 65 feet bgs in each well Soil samples were collected at approximate 5-foot intervals beginning at different starting depths in each of the wells (Analytical results for soil samples are included in Appendix C, Table C-1) The soil samples were submitted to a laboratory for analysis of extractable petroleum hydrocarbons, and purgeable aromatics None of the compounds analyzed for were detected in the samples collected In October 1994, ICF Kaiser (ICF Kaiser 1994) drilled three additional borings (V13O1, SBO1 and MW-5) and completed one of these as monitoring well MW-5 MW-5 was drilled to a depth of 80 feet bgs Section-5- _ provides information on this investigation �r3.3 1 3 3 2 Soil Gas Survey and Soil Sampling A soil gas survey and soil sampling investigation was conducted in September 1996 to further investigate the lateral and vertical extent of petroleum hydrocarbon affected soil and soil gas at the former Union Ice facility (Darr Associates and ICF Kai sei 1997) 1 he soil gas investigation consisted of collecting soil gas samples from 8 locations (Appendix E contains a figures depicting the soil gas sampling locations and a summary of the analytical results, as well as the results of soil physical properties analysis) Soil gas samples were attempted to be collected at depths of 15, 30, and 45 feet bgs from each sampling locations The only contaminants detected in soil gas were in the vicinity of Tank No 3, and were very low Eight confirmation soil samples were also collected and analyzed for petroleum hydrocarbons by Methods 8020, 3550 extraction, and TCLP extraction (Appendix C) The only detections by Methods 8020 and 3550 extraction were 10 mg/kg TPHk in sample SV135-45 6 0 xylenes in sample SVB1-30, and 0 8 mg/kg TPHg and 6 0 ug/kg xylenes in sample SVB6-30 These are all acceptably low concentrations for residual soils Finally-, the soil sample with the highest detected petroleum hydrocarbon concentration (SVB5-45) was analyzed by TCLP extraction, and no petroleum hydrocarbons were detected (Appendix C) vel Monitoring and Groundwater Quality Sampling 3 3 3 Historical Groundwater I e g Groundwater level monitoring and sampling for laboratory an-ilyses has occurred at the Site since 1992 The results of the sampling from the monitoring events ftoln 1992 thrZe!ctio 1997 are Z summarized in the quarterly groundwater monitoring report, ,uinmarized inn 1 ne additional groundwater monitoring event occurred in Septem16ei 1998, as summarized in the • following section C 1M%FileslAnnelwpwmNprojecisluntan\C.losuuRpl wpd 3