ARCHIVED REPORTS_2014 - Laserfiche WebLink

Home Browse Search

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 lined compost facility retention basin at the Forward Landfill. The CQA Manual outlines the specific field and laboratory testing and monitoring procedures required to demonstrate that the compost facility retention basin is constructed in accordance with Title 27 requirements. Following the completion of the work for the compost facility retention basin,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 design and regulatory requirements. As-built drawings shall also be included. 1.2 Project Description Lewis Engineering designed the compost facility retention basin in accordance with Forward's Waste Discharge Requirements (WDR Order No.R5-2014-0006) and applicable state and federal regulations. The provisions of particular importance regarding the design are: • The retention basin was sized for all runoff and direct precipitation from the 25-year, 24 hour storm and maintain a 2-ft freeboard. • The retention basin is equipped with a synthetic liner and designed and operated to minimize the downward percolation of constituents. The compost facility retention basin will be located in the current sedimentation pond area,directly west of the compost facility. The retention basin will be lined with a 60-mil single sided textured HDPE geomembrane underlain by a geosynthetic clay liner. The retention basin will encompass approximately 2-acres and will extend approximately 240 feet in the north-south dimension and 460 feet in the east-west dimension.The crest of the retention basin is at elevation 35-ft. The base of the retention basin ranges from elevation 21-ft in the southern corner to 26-ft in the northeast. A pan lysimeter is located under the lining system in the southwest corner of the basin. The basin has a total capacity of 760,600 cf(approx. 5.7 million gallons)and 598,700 cf(approx.4.5 million gallons)not including the 2-ft freeboard. Compost runoff water sheet flows to perimeter v- ditches which direct the runoff to two pond inlet pipes/culverts. The inverts of the pipe inlets at the pond are at elevations 31.71 and 32.66-ft for the north and south inlets, respectively. The pond is designed to have sufficient storage capacity to maintain the runoff from the 25-yr,24 hr storm below Page I