COMPLIANCE INFO_REV.4TH QTR-ANNUAL REPORT 6/26/2025

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3 LY-E2A, LY-E2B, and D93B to be removed from the MRP in the next revision.  Soil pore gas samples from all lysimeter locations listed in Table 6 of the MRP and on Figures 2 and 3 of the enclosed report were not screened for VOCs and methane as required by Table 7 of the MRP. The corrective action will be to include soil pore gas sampling and screening for VOCs at these locations beginning in second quarter 2025.  Suction lysimeter FU-10 is included in Table 18 of the MRP and shown on Figure 2 of the enclosed report; however, no historical data exist for this location and it is not included in the previous Waste Discharge Requirements Order No. R5-2014-0006. The inclusion of this sampling location is a typographical error; therefore, the proposed corrective action is for this location to be removed from the MRP in the next revision.  Groundwater extraction well CDCR-EW-1 is included in Table 19 of the MRP and shown on Figure 6 of the enclosed report; however, this location on the offsite CDCR property was not sampled during the fourth quarter 2024 sampling event. The corrective action will be to add this location to the quarterly monitoring program beginning in second quarter 2025.  Sump FU-17, listed in Table 25 of the MRP, consists of two temporary sumps, TS-3 and TS-4. These locations were inaccessible and then were relocated during the construction of WMU FU-24. Temporary sumps TS-3 and TS-4 are now sumps for WMU FU-24 (see locations on Figure 4 of the enclosed report). The proposed corrective action is to add these temporary sumps to Table 25 of the MRP in the next revision.  Sump D-89 is included in Table 25 of the MRP and shown on Figure 4 of the enclosed report; however, this sump was not sampled during the fourth quarter 2024 sampling event because the sump needs to be repaired. The corrective action will be to repair the sump and sample during second quarter 2025.  Sump FU-23 is listed in Table 25 of the MRP; however, this location does not exist for WMU FU-23. Two temporary sumps, TS-1 and TS-2, as shown on Figure 4 of the enclosed report, are the sump monitoring points for WMU FU-23. The proposed corrective action is to add these temporary sumps to Table 25 of the MRP in the next revision.  Sump D-93/94 for WMU D-93/94, listed in Table 25 of the MRP, was improperly labeled in the field as D- 93/95 and has been labeled as D-93/95 since May 13, 2020 (see location on Figure 4 of the enclosed report). The corrective action will be to resume referencing the appropriate nomenclature beginning in second quarter 2025.  MRP Section E.2.g requires a waste fill map, which was not included in the first submittal of the enclosed report. A waste fill map has been included in Appendix F of the enclosed report and the corrective action will be to include this map in all future annual reports. Proposed Additions to the MRP The following locations are not currently part of the MRP and will need to be incorporated in the next revision of the MRP:  Eight monitoring wells (AMW-60S, AMW-60M, AMW-61S, AMW-61M, AMW-54R, AMW-62, AMW-63, and AMW-64), as shown on Figure 1 of the enclosed report, were added to the monitoring well network in fourth quarter 2024 and fill the data gap on the northeast corner of the site as required by section B.1.a of the MRP. These locations should be added to Table 19 of the MRP in the next revision.  Two pan lysimeters and sumps (pan lysimeters TS-1 and TS-2 and sumps TS-1 and TS-2) associated with WMU FU-23 are shown on Figure 4 of the enclosed report. Sumps TS-1 and TS-2 were added to the quarterly monitoring program in fourth quarter 2024 and pan lysimeters TS-1 and TS-2 will be added to the quarterly monitoring program in second quarter 2025. These locations should be added to Tables 6 and 25 of the MRP in the next revision.