ARCHIVED REPORTS_XR0001980 - Laserfiche WebLink

Home Browse Search

Mr Kyle Christie Project 0805-140 03 October 5, 1995 Page 2 During drilling of soil boring B-18, a product hne 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 hmrts 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 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]) was present Concentrations of volatile organic compounds, • senuvolatile organic compounds, and polychlorinated biphenyls (PCBs) were below detection limits Total metals were also below detection limits, with the exception of arsenic and banum, which were detected at concentrations of 0 0051 and 0 12 parts per million(ppm), 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 In May 1994, RESNA submitted a Problem Assessment Report (RESNA, May 11, 1994, Report No 30004-8) to the San Joaquin County Public Health Services (SJCPHS) and the California Regional Water Quality Control Board A Final Remediation Plan will be prepared by EMCON, and subsequent remediation will be implemented in the future PROPOSED WORK This work will be conducted in accordance with the Tri-Regional Guidelines and EMCON's field procedures Field procedures are presented in the attachment According to information supplied by ARCO, there are five USTs at the site two 4,000-gallon tanks, one 6,000-gallon tank, one 10,000-gallon tank that stored leaded gasoline, and one 280-gallon former waste oil tank Due to the location of the proposed tank cavity, well • MW-1 and possibly well MW-2 will need to be abandoned and two additional monitoring Q wells (MW-7 and MW-8) and one vapor extraction well (VW-5) will need to be installed at SACU URC0V05481DE51GW805t400 3AS-95 wpt 3