COMPLIANCE INFO_FINAL WMU FU-23 DESIGN RPT & CONCURRENCE LTRS

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Page 1 1 INTRODUCTION 1.1 Purpose This Construction Quality Assurance (CQA) Manual has been prepared for Forward, Inc. (Forward) by a Registered Civil Engineer in accordance with Title 27, California Code of Regulations (CCR), Division 2, Sections 20323 and 20324, titled "CQA Plan and CQA Requirements." This manual describes CQA procedures for construction of the liner and leachate collection and removal system (LCRS) for Waste Management Unit FU-23 (WMU FU-23). WMU FU-23 is designed to comply with the construction standards of Title 27 by using a composite liner and blanket LCRS. The CQA Manual outlines the specific field and laboratory testing and monitoring procedures required to demonstrate that WMU FU-23 is constructed in accordance with Title 27 requirements. Following the completion of the work for WMU FU-23, the Quality Assurance/ Quality Control (QA/QC) Consultant will prepare a final CQA Report. The CQA Report shall be submitted to the Owner within 20 days of construction completion. The purpose of the CQA Report is to document that the materials and construction processes comply with the WMU FU-23 design and regulatory requirements. As-built drawings and a discussion on the refuse fill stability of WMU FU-23 based on the actual interface shear strength test results obtained during the CQA testing program shall also be included. 1.2 Project Description Lewis Engineering designed WMU FU-23 in accordance with Forward's Waste Discharge Requirements (WDR Order No. R5-2014-0006), as well as applicable state and federal regulations. The provisions of particular importance regarding the design are: • The WMU FU-23 lining and leachate collection and removal system (LCRS) design shall conform to construction standards of Title 27 by using a composite liner and blanket LCRS. • Leak location testing will be performed on the geomembrane on the base of the cell following placement of the operations layer WMU FU-23 will be constructed east of WMUs FU-17 and FU-19 and will consolidate the existing refuse mass eastwards (see Design and Construction Documents, Waste Management Unit FU-23, Forward Landfill, Lewis Engineering, February 2023). The liner will encompass approximately 4.5- acres and will extend approximately 200 feet in the east-west dimension, although the southern portion of WMU FU-23 connects with WMU FU-19 and is approximately 540-ft. The north-south dimension is approximately 680 feet. The top of clay liner on the base of WMU FU-23 will be at approximately elevation 1-foot to 6-feet, which is about 36 to 41-feet below the native ground surface on the south side of the WMU. A composite lining system consisting of a 2-foot-thick clay liner overlain by a 60-mil, high-density polyethylene (HDPE) geomembrane, and LCRS consisting of 1 foot of granular drainage material