ARCHIVED REPORTS_XR0012693 - Laserfiche WebLink

Home Browse Search

i MR Vn i+O The advantage of this system is the elimination of the waste stream handling associated with GAC. Disadvantages include reduced reliability and higher cost. Capital cost for this system totals $370,000; operation and maintenance adds about $63,000 per year. Aiderrtative 3— M Peroxide Treatment This method destroys the hydrocarbon compounds by oxidation. Hydrogen peroxide is added to the groundwater, which is then subjected to ultraviolet (UV) light. This creates hydroxyl radicals, which oxidize the hydrocarbons. The products are carbon dioxide and water. Advantages to this system are lower maintenance and elimination of contaminated residual. Problems associated with scale fouling, common to air strippers, are largely eliminated. Disadvantages include high power consumption and the need for pilot testing. This method is also not as flexible; the system is less adaptable-to different influent concentrations or flow rates. There are vendors who will lease these systems, providing some flexibility for change. Capital cost for a UV-peroxide system would be about $265,000, assuming Del Monte purchases the system at startup. O&M costs are estimated at about $59,000 per year: about half of this is for electric power, Summary Costs for Alternatives 1 and 3 are essentially equal. Alternative 2 is substantially higher and is not recommended for this site. The O&M for Alternative 1 can be expected to decrease with time as influent concentrations drop; sinre carbon replacement is the largest component of the cost, this may have a substantiai effect on long-term cost. Alternative 2 can be obtained by lease,with service as part of the contract. This can ,M reduce the initial cost and incidental expense to Del Monte. The UV-peroxide system is not, however, as adaptable to changing conditions; O&M cost is largely unrelated to influent concentration. Because the influent stream to the treatment process is not well-defined and is expected to change with time, Alternative 1 is recommended for this site. Recommended Remedial Action Pian Implementing a remedy in phases will allow remediation of the Disco location to begin E as soon as possibleand provides an opportunity to "fine tune" the proposed remediation system, This Remedial Action Plan (RAP) describes_actions-for. a _ . "Phase P to address the near-source area. This will allow for timely action'in the area of greatest concern and will prevent migration of the most highly contaminated SF0316W RFV07.51 4-8