ARCHIVED REPORTS_2015 - Laserfiche WebLink

Home Browse Search

As-Built CQA Report for the Construction of Area 2A at the Foothill Sanitary Landfill San Joaquin County,California • The AES' CQA team was led by Michael Raub, C.E.G. as the CQA Manager, and was supported by Earthworks and Geosynthetics CQA Monitors. The overall CQA program was performed under the technical review of Kris Khilnani, PE, GE,the AES Principal-In-Charge for the project. The daily field reports of CQA activities are included in Appendix A.Selected photographs of various construction activities are included in Appendix B. 1.4 PROJECT DOCUMENTS The following project documents were used to implement the construction and CQA services for the Area 2A composite liner construction: ■ "Specifications (Including Special Provisions, Notices to Bidders, Bid and Contract) for the Construction of Area 2A at the Foothill Sanitary Landfill," prepared by the County, dated December 10, 2014,and Addendum 1 dated January 30, 2015. ■ Construction Drawings prepared by Geosyntec,dated December 10, 2014. ■ Construction Quality Assurance Manual prepared by Geosyntec,dated November, 2014. ■ Standard Specifications, Department of Transportation,State of California,dated 2010. ■ Standard Plans, Department of Transportation, State of California, dated 2010. • In addition, some modifications to Specifications, Construction Drawings and design details were implemented based on the exposed site conditions and requests for variances from the Contractor, as reviewed and approved by the County and the Design A-E firm, Geosyntec. The major revisions are listed in the following section. 1.5 CONSTRUCTION SPECIFICATION AND DESIGN VARIANCES A few specification revisions were made during Area 2A liner construction based on the material availability and exposed site conditions.These revisions are listed below: a. Foundation Layer Particle Size: The maximum particle size for the foundation layer was specified at 3/s-inch and the CQA Manual further defined the maximum clod size of 1-inch. During the placement of the foundation layer,the Contractor made repeated passes with the compaction equipment to reduce clod size; however, sampling of the foundation layer during placement revealed minor amount of(approximately 3 to 5 percent) clods between 1-inch and 2-inch size. Laboratory gradation analysis of samples of the placed foundation layer soil indicated that when subject to normal laboratory procedure for sieve analysis per ASTM D422, the maximum particle size was less than 3/s inch (see Appendix E.2). Based on this data, it was concluded that the presence of this small amount of clods would not affect the performance of the foundation layer and the foundation layer material was deemed • acceptable. PA14 Projects114-101(SJCDPW North County and Foothillffoothill CQA1Report\Final ReportToothill CQA Rport-Final.docx 4