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Forward, Inc. - 2 - 17 May 2023 Forward Landfill The side slope liner components of WMU FU-23 consist of the following, from top to bottom: • 12-inches thick operations layer • Geocomposite drainage net • Primary 60-mil textured HDPE geomembrane liner • Geosynthetic clay liner (GCL) • Subgrade The slope stability analysis for FU-23 evaluated the eastern slope grades for a maximum refuse elevation of 110 ft MSL. This is the maximum elevation that will be achieved prior to the development of adjacent waste management units. A Construction Quality Assurance Report (CQA report) shall be submitted upon completion of WMU FU-23. The discharge of waste to the new unit shall not commence until the CQA report is approved by Central Valley Water Board staff. On 9 May 2023, Central Valley Water Board staff requested additional information and revisions via electronic mail. On 15 May 2023, Lewis Engineering submitted "WMU FU- 23 Construction Drawings Revision 1" and addressed staff comments. Based on the additional information received, Central Valley Water Board staff concur that WMU FU- 23 adheres to the WDRs and Title 27. At least 48 hours prior to construction, Forward shall notify Central Valley Water Board staff the construction start date via email. If you have any questions regarding this correspondence, please contact Stephani Gisi at stephani.gisi(a)-waterboards.ca.gov or Brad Shelton at brad.shelton(o-)_waterboards.ca.gov. Sincerely, �+ Digitally signed by Brad Brad Shelton Date:2023.05.17 15:18:43-07'00' Brad Shelton, P.G. Senior Engineering Geologist Title 27 Permitting and Mining Unit cc: Howard Hold, Central Valley Regional Water Board, Rancho Cordova Stephani Gisi, Central Valley Regional Water Board, Rancho Cordova Natalia Subbotnikova, San Joaquin County Environmental Health Department, Stockton Benjamin Wade, Area Manager, Republic Services Inc. Sangeeta Lewis, Lewis Engineering, Piedmont