ARCHIVED REPORTS XR0002747 - Laserfiche WebLink

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it .. • i � and 23 8 ppb (MW-1), respectively Tert-butyl alcohol TBA was reported in wells MW-2 (215 ppb) and MW-4 (26,100 ppb) Ethyl tert- - butyl ether (EtBE) was reported in well MW-4 at a concentration of 2 22 ppb On February 12-16, 2001, SECOR performed multi-phase extraction (MPE) feasibility testing at the site to evaluate whether MPE technology is a feasible remedial alternative for mitigating hydrocarbon-impacted soil The results of the feasibility test are as follows • The MPE test was conducted at maximum vapor extraction flow rates ranging between 32 7 to 99 2 standard cubic feet per minute (scfm) (MW-4/SVE-1), and at vacuum pressures ranging between 5 5 to 25 inches of water column (MW-4/SVE-1) • Induced vacuum readings were observed in observation wells up to 89 feet away from the extraction well Based on the responding induced vacuums, the radii of influence for the test ranged between 46 7 feet and 89 2 feet Field FID readings of total hydrocarbons in the vapor stream extracted from the test wells consistently exceeded 10,000 parts per million by volume (ppmv) During the test approximately 544 3 pounds of TPHg, 19 5 pounds of benzene, and 440 pounds of MtBE were extracted from the soil beneath the site From July 9 to July 16, 2001, West Hazmat Drilling of Rancho Cordova, California drilled two soil bonngs and five groundwater monitoring wells at the site Soil borings SB-1 and SB-2 were drilled to 80 feet and 78 feet bgs, respectively Monitoring wells MW-5, MW-6, MW-7, MW-8, and MW-9 were installed at 40 feet bgs SPH is present in wells MW-4 and SVE-1 Weekly gauging and bailing was initiated in October 2001 3.0 Client Safety Procedures Follow standard ARCO safety procedures SECOR International Incorporated 2 Genene HASP