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Environmental Compliance Review Report H.M. Holloway Landfill December 2017 with biosolid waste during disposal of biosolid wastes in authorized disposal pits (Pit G and Pit F/G connection area). • Per the approved CUP, six inches of clean soil will be placed over the stabilized biosolid waste on a daily basis. • The Holloway facility is currently using fly ash from other facilities to stabilize biosolid wastes. The pH level of the fly ash transported from other facilities is below 12.5. • Biosolid waste is stabilized with fly ash at a volumetric ratio of 1:1, spread in six inch to two foot thick layers, and compacted. • Dry fly ash samples, collected from the DTE Stockton and Mt. Poso facilities, were analyzed for pH. Reported pH levels were 12.54 for the DTE Stockton generated ash and 11.64 for the Mt. Poso generated ash. DTE Stockton and Mt. Poso generated ash was blended with the biosolid wastes at a volumetric ratio of 1:1 and analyzed for pH. The pH level for the fly ash stabilized biosolid was 8.89 pH unit. • Title 22 California Assessment Metals (CAM 17) test was performed on the Mt. Poso fly ash. Reported concentrations of CAM 17 metals were below the total threshold limit concentration (TTLC) and soluble threshold limit concentration(STLC) regulatory limits. Refer to Appendix F for the summary of bench test analytical results. • The Holloway facility plans to perform random pH sampling during stabilization of biosolid wastes with fly ash to ensure pH levels remain below 12.5 pH units. Photographs are included in Appendix E- Site Visit Photo Log. 6.0 COMPLIANCE EVALUATION FINDINGS TRC completed the limited compliance evaluation of the Holliday facility in accordance with the evaluation criteria agreed upon with DTE, and methodology outlined in Section 2.0. The compliance findings are as follows: EDR AuditcheckTM Facility Report • None of these database listings indicate a pending environmental compliance enforcement action or violation associated with the Holloway facility operating permits or conditions. EDR AuditcheckTM Facility Report • None of the included database listings indicate pending or active environmental compliance enforcement action or violation associated with Holloway operating permits or conditions. Air • The facility operates under the permit number 5-7754-1-1, issued by the San Joaquin Valley Air Pollution Control District that expires in May 2020. The facility can only receive the following materials to be placed into their landfill: Class A biosolids, Class B biosolids, lime cake, fly-ash, spent abrasive blasting material and treated nonhazardous auto shredder waste. 9