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Emergency Remediation 2480 Tracy Blvd., Tracy, CA. • Page 15 The last discharge to the sanitary sewer occurred on April 26, 1996 and the last Baker tank to be demobilized left the site, empty, on April 27, 1996. As measured by a flow totalizer in the discharge line, the total volume of treated water discharged amounted to 148,160 gallon. That total was released from the Baker tanks to the sanitary sewer in seven, separately-tested batches. I A copy of a certified report (with attached copies of the applicable certificates of analysis and chain-of-custody records for the samples of the discharged water) from the engineer of record to the City of Tracy that documents the quality and total volume of the water discharged to the sanitary sewer is presented in Appendix B. The sample numbers cited on the certificates of analysis correspond to the identification numbers on the Baker tanks holding the treated water to which the respective analytical results apply. Staging, Profiling and Disposal of Spent Carbon i On May 5 1996, following completion of the emergency remediation program, the treatment-system piping and instrumentation were dismantled and the GAC retorts were fully drained of liquid. The spent carbon was decanted into open-topped, 50-gallon drums which were closed by securely fastened lids. The drums were staged adjacent to the rear access to the site until the carbon could be classified according to the applicable Federal and California requirements for transport and disposal of regulated materials. At the time that the spent carbon was transferred to the 50-gallon drums, a representative, bulk sample of the material was obtained, labeled, entered into chain-of-custody control, and packed in a cooler for shipment to Wheelabrator Clean Air System Inc.'s laboratory in Los Angeles, California, where it was analyzed by the Zero Headspace Toxicity Characteristics Leaching Procedure (TCLP). On May 20, 1996, the laboratory reported that any volatile, purgable organic compounds detectable by EPA Method 601/602 in the spent carbon (if any were actually present) were at concentrations less than the MDL. This result demonstrated that the spent carbon was non-hazardous under either California or Federal regulations and could be shipped off site without regulatory permit. After the laboratory results were received, a Spent Carbon Profile Form was completed and submitted to Westates Carbon-Arizona Inc. (Westates). That company operates a spent carbon regeneration facility in Parker, Arizona. A copy of the completed form, together with the certificate of analyses for the sample of the carbon that was used for the TCLP test, is presented in Appendix C. After reviewing the form, Westates issued Profile Approval Number 960162NH to authorize acceptance of the spent carbon at their regeneration facility. i