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M <br /> k <br /> i <br /> PFE] <br /> E] GROUNDWATERTI❑ TECHNOLOGY, INC• 4057 Por Chicago Highway.Concord.CA945201415)671-2387 <br /> FAX:(415)685-9148 <br /> August 28, 1991 <br /> Nv k <br /> I <br /> l <br /> Mr. Steve Schneider t E � Y <br /> San Joaquin County Public Health Service t <br /> PO Box 2009 SEP <br /> 1601 East Hazelton Ave <br /> Stockton, CA 95201 �NVIRON%MEN TAL HEALTH <br /> PERM 11T/SERVICES <br /> RE: MANNA PRO FACILITY <br /> STOCKTON, CA <br /> Dear Mr. Schneider, <br /> The purpose of this letter is to provide an outline of the remedial strategy which we presently believe should <br /> be employed at the Manna Pro facility in Stockton, CA. This plan is intended to meet the cleanup <br /> requirements of the applicable regulatory agencies in a timely and cost-effective manner for Manna Pro,and <br /> is based on our current understanding of site conditions. The specific details of remediation system design <br /> are based on our past experience, and will be verified by field testing during the design process where <br /> appropriate. This strategy is subject to further refinement and revision as facts or circumstances arise which <br /> impact the site. This strategy is divided into four parts: <br /> - Treatment of above-ground soils <br /> - Definition and remediation of the groundwater contamination <br /> - Treatment of in place contaminated soils <br /> - Quarterly groundwater monitoring. <br /> TREATMENT OF ABOVE-GROUND SOILS <br /> Manna Pro proposes to treat the portion of stockpiled soils which are contaminated by using above-ground <br /> bioremediation/passive aeration. This technique will decrease the levels of remaining diesel contamination. <br /> Bioremediation is a natural process whereby indigenous micro organisms utilize hydrocarbons as an energy <br /> source. The microorganisms break down the hydrocarbons to carbon dioxide and water. This degradation <br /> will occur at an increased rate when oxygen and nutrients are supplied. <br /> Construction and operation of shallow-depth soils treatment cells serve two functions: 1) volatilization of <br /> light-end compounds, and 2) soils oxygenation. Manna Pro proposes to construct the treatment cells on- <br /> site; the exact location and dimensions of these cells will be determined during the preparation of the <br /> detailed work plan. Treatment cells will be lined with a synthetic material to prevent leachate from leaving <br /> the cells and contaminating the underlying soils. Nutrients will be applied during cell construction to supply <br /> nitrogen and phosphorus to the microbes. After cell construction, the most significant biodegradation will <br /> occur within 3-4 months;activity will continue after this time period at reduced rates. Upon final remediation <br /> of the soils, Manna Pro proposes to use the soil as backfill on site to fill the current excavation. The exact <br /> cleanup levels for this use will be proposed in the work plan, subject to review and approval by the various <br /> regulatory agencies. <br /> Offices throughout the U.S..Canada and Overseas <br />