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-2- <br /> WASTE DISCHARGE REQUIREMENTS FOR <br /> CITY OF TRACY <br /> CLASS 11 LAND TREATMENT FACILITY <br /> SAN JOAQUIN COUNTY <br /> WASTES AND THEIR CLASSIFICATION <br /> 5. Since 1991, the Discharger has used this unpermitted facility for storage of untreated <br /> nonhazardous petroleum hydrocarbon contaminated soils f�inated soilslar Presently <br /> operations. Approximately 6000 cubic yards (cy) Oject in <br /> GO 0 <br /> st�cularthprojects known as the S h to Road extenssite. These sos originated from Citysiion and the 11th Streetrproject. <br /> P Phve <br /> Other wastes, including concreteoils oriwastes a the facility but only toed <br /> er <br /> does not propose o placeeanyyadditional s <br /> and store, for use or disposal, the soils that are already there. <br /> 6. Of the soils presently stored at the facility, approximately 5,000 cy are contaminated <br /> with heavy petroleum fractions consisting primarily of Bunker oil. These soils were <br /> at the <br /> removed in 1991 rom soils Schulte <br /> ulte y�stored at the facility are ent r�onntamnatedwith gasoline <br /> subject facility. Other <br /> and oil. <br /> 7. The Schulte Road soils originally comprised approximately 12,000 cy. Approximately <br /> 6,000 cy of those soils were re-used in construction projects, specifically as road base. <br /> This was allowed by agreement with the Regional Board, as stated in a staff letter dated <br /> 17 May 1991, on the condition that the re-use projects involve encapsulation of the <br /> contaminated soils, and based on chemical analyses showing that the soils contained <br /> hydrocarbon contamination levels of 800 mg/kg or less, with no volatile components. <br /> 8. The 800 mg/kg value was suggested by the consultant to the Discharger based on a <br /> December 1990 determination by the California Department of Health Services (now <br /> Department of Toxic Substances Control) for a nearby project site with similar <br /> hydrogeologic conditions and similar contaminants. The level was agreed upon by <br /> Regional Board staff for the Schulte Road soils only. <br /> 9. The Discharger has proposed bioremediation to treat the remaining soils, and then to <br /> reuse them in specified City construction projects, subject to approval from the Regional <br /> Board. <br /> 10. All of the stored soils contain petroleum fractions, which could pose a threat to water <br /> quality if discharged in an uncontrolled manner, and therefore the soils are classified as <br /> designated wastes using the criteria set forth in Title 23, California Code of Regulations, <br /> Division 3, Chapter 15 (hereafter Chapter 15). The treated soils also may be classified <br />