Laserfiche WebLink
06 October 2008 <br /> AGE-NC Project No. 06- 1457 <br /> Page 2 of 7 <br /> 3.0. SCOPE OF WORK <br /> Based on analytical results from previous site assessment activities, the mass of hydrocarbon- <br /> impacted soil at the site appears to be within the saturated zone in the former UST area near wells <br /> EW- 1 and MW- 1 as shown in Figure 4. hnpact__ a _d soils remain in the saturated zone at the site�27 s� s <br /> feet below surface grade (bsg) yet above a depth of 70 feet bsQ. Impacted ground water is focused <br /> in the former UST area near well EW- 1 . <br /> ' �v' Based upon the results of the groundwater extraction well EW- Ion 20December <br /> 2006, ground water extraction well EW4 appears adequately developed. The conclusions and <br /> recommendations made in the AGE-prepared Ground Water Pump Test and Soil Vapor Extraction <br /> Pilot Test Report dated 20 March 2006 by remain valid: ground water extraction at the site does not <br /> appear feasible. The site hydrogeologic condition are ideal for dual-phase extraction (SVE/shallow <br /> ground water) and will allow for the remediation impacted hydrocarbon mass at depths below the <br /> current water table of approximately 25 feet below surface grade. The second benefit for DPE would <br /> be removal severely MTBE-impacted ground water. <br /> AGE proposes the performance ofa3 -daydualphasesoil-va of roundwater extraction (DPE) pilot <br /> study to evaluate the effectiveness of the DPE process and prepare for additional remediation of <br /> impacted soil and ground water at the site, should "full-scale" or "enhanced" remediation be <br /> necessary. The proposed scope of work will include the following tasks : <br /> • Pre-field work preparations; <br /> • DPE pilot study; and <br /> • Evaluation of the pilot study with preparation of a report of findings . <br /> 3 . 1 . PRE-FIELD WORK PREPARATIONS <br /> An update to the health and safety plan presently on-file will be prepared in accordance with <br /> Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National <br /> Institute for Occupational Safety and Health Administration, U. S . Coast Guard and U. S . <br /> Environmental Protection Agency, 1985). <br /> 3 .2, DPE PILOT STUDY <br /> The proposed remedial pilot study will utilize a high vacuum dual phase extraction system intended <br /> to remove hydrocarbons from the vadose, capillary fringe and upper saturated zones. AGE proposes <br /> Advanced GeoEnvironmental, Inc. <br />