ARCHIVED REPORTS XR0009446 - Laserfiche WebLink

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Work Plan for Charactenzation and Remediation of Stockpiled Sods July 30, 1992 Manna Pro Facility, 4004 EI Dorado Street, Stockton, CA 6 Task 3 Soil Remediation Based on analytical results from previous stockpile sampling performed by ERM in November 1990 (Table 3-3, Appendix A), and the target concentrations set forth under Task 1 of this work plan, we have estimated that approximately 1,000 cubic yards of sod will require remediation before it can be used as backfill matenal A remediation area will be prepared on the fenced open space of the property to the north of the tank pit excavation and stockpiles (Figure 2) Clean soil from a recent excavation on the northern property boundary will be used to form a continuous berm around the remediation area A 10-mil polyethylene liner will be place within the bermed area to prevent leachate or impacted soils from Icontacting the clean soil and the surface under and around the remediation area Impacted sods will be transferred to the remediation area using earth moving equipment The sods will be spread over the remediation area, within the clean soil berm, to form a cell approximately 1 foot high It is estimated that the cell will encompass an area of approximately 27,000 square feet, based on an assumed total soil volume of 1,000 cubic yards Remediation will be accomplished by uncontrolled aeration, assisted by enhanced biodegradation Inorganic nutrients will be applied to the soil at the start of remediation to accelerate the natural biodegradation that will be occurring within the soils The soil will also be tilled periodically to facilitate aeration of volatile hydrocarbons, to assist in the mixing of the inorganic nutrients, and to ' provide an enriched source of oxygen for the microbial community within the impacted soil Additional applications of nutrients may be used d deemed appropriate It is assumed that the remediation process will require a maximum of approximately four months to achieve target concentrations Task 4: Soil Confirmation Sampling A confirmation sampling will be performed to document completion of the remediation process Sampling will be performed as described under Task 1 for the characterization of the impacted stockpiled soil The proposed density of sample collection for the confirmation sampling is one four- part composite for each 200 yards of remedlated soil It is estimated that approximately 5 soil samples will be analyzed during the confirmation round, based on an assumed soil volume of 1,000 (moi GROUNDWATER TECHNOLOGY INC f