ARCHIVED REPORTS_2019 SOIL MGMT PLAN (JULY-REVISED)

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22 February 2019 AGE-Project No. 14-3154 Page 7 of 12 impact at Parcel B was prepared under a separate cover, titled Addendum to the Request for Exemption to Implement Construction Controls dated 12 July 2018 (Exemption Request). Additionally, soil-gas samples were collected monthly throughout 2018 from wells SGMW -1 and SGMW -2 located on Parcel B, adjacent to the remaining glass waste at the Cogen facility (Figure 2). The most recent soil gas sampling event was reported in the BAI-prepared, December 2018 Soil Gas Monitoring dated 27 December 2018 (Appendix E). Analytical results of soil gas samples are presented in Table 7. Based on monthly soil-gas sampling performed in 2018 and as described in the Exemption Request, soil-gas sampling has not indicated any soil-gas data of concern associated with the removed and remaining wastes within Disposal Site SWIS 39-CR- 0022. The EHD approved the exemption request for Parcel B based on the results of soil- gas sampling and the evaluation presented in the Exemption Request. An exemption is requested for onsite gas monitoring in the WU1 area on Parcel A following approval of the Clean Closure Plan. 6.5. GROUNDWATER IMPACTS Groundwater samples have not been collected beneath disposal area WU1 at Parcel A. However, groundwater samples were collected beneath WU1 at Parcel B. An evaluation of groundwater impacts was presented in the AGE-prepared Site Assessment Summary Report – Final dated 21 June 2018. The EHD and Regional Water Board concurred with clean closure for Parcel B based on the results of groundwater sampling and the evaluations presented in the Site Assessment Summary Report – Final and the Clean Closure Plan. It is anticipated that the small area of WU1 wastes beneath Parcel A is of similar character and composition as the wastes that were extensively characterized to the south beneath Parcel B. Therefore, groundwater characterization beneath the WU1 area on Parcel A is not warranted. 7.0. EXCAVATION AND MATERIAL MANAGEMENT PLAN [Section 21810(c)(3)] AGE proposes to excavate, remove, and properly dispose of the remaining waste materials from WU1 that extend on to Parcel A. The work will be performed in accordance with the approved BAI-prepared EMMP dated 09 March 2018 and Addendum to EMMP dated 22 March 2018. The EMMP was developed to excavate, remove, and manage solid waste materials and soil located in disposal area WU1 on Parcel B. The EMMP was approved by the Regional Water Board and EHD.