ARCHIVED REPORTS XR0000472 - Laserfiche WebLink

Home Browse Search

7 The air spar-ma wells will be screened entirely below the groundwater and the surface vapor extraction wells will be screened from 2 feet below the groundwater surface to within 5 feet of the ground surface The dual-completion SVE and AS (V-9/S-7 and V-10/S-8) wells are designed for soil vapor extraction and sparging of groundwater in a single borehole - - Groundwater is currently estimated at 15 to 18 feet below ground surface (bgs) The two - dual-completion wells will be dnlled using a truck-mounted drilling rig equipped with 10-inch-outside-diameter hollow-stem augers Each borehole will be advanced to approximately 25 feet bas Single-completion SVE and AS wells will be drilled using 8-inch-outside-diameter augers Each single-completion SVE well borehole will be advanced to approximately 20 feet be Each single-completion AS well borehole will be advanced to 25 feet bgs Standard drilling procedures are described in Appendix A Borehole cuttings will be temporarily placed on plastic sheeting and covered with plastic The disposal of these cuttings is the responsibility of ARCO Soil Sampling Soil samples for Iithologic classification will be collected every 5 feet from all boreholes to the total depth of each borehole Soil samples for laboratory analysis will be collected from 5, 10, and 15 feet below ground surface from boreholes V-10/S-8. V-9/S-7, and V-12 and from 15 foot bgs from borehole S-9 Soil samples were collected from 5 and 10 feet in borehole AS-5 (next to proposed borehole S-9) during a previous investigation Due to the adequate characterization of the soil from previous investigations, soil samples from boreholes V-1I and V-8 will not be collected for laboratory analysis Field readings of soil vapors (using a PID or FID) will be monitored and noted from each sample A Iithologic log of each borehole will be completed according to the Unified Soil CIassification System The boreholes will be loafed by a professional geologist working under the direct supervision of a registered geologist Standard soil sampling procedures are described in Appendix A Soil samples will be analyzed for benzene, toluene, ethylbenzene, total xylenes (BTEX) and total petroleum hydrocarbons as gasoline (TPH-G) by U S Environmental Protection Agency (EPA) Methods 8020 and 8015 Modified, respectively Stockpiled soil will be sampled for disposal purposes on a I-week turnaround In addition to the above constituents, the stockpile soil samples will be analyzed for reactive sulfides and cyanides by EPA Method 9010, corrosivity (pH) by EPA Method 9045, Ignitability (flash point) by EPA Method 1010, and Soluble Threshold Limit Concentration lead by EPA Method 6010/7000 series Use or disclosure of data contained on this sheet is subject to the restriciton specified at the beginning of this document 15061iLEPORTSSWORKPCAAI �r