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Stage 1A Partial Final Closure February 2006 <br /> Forward Landfill Project No.021605.06 <br /> 4.0 EARTHWORKS CONSTRUCTION <br /> As the earthworks construction was implemented, Vector performed CQA <br /> monitoring. This section describes the CQA tasks associated with the <br /> construction of the earthworks components of the Stage lA closure. The <br /> elements monitored by Vector and discussed within this section include <br /> subgrade preparation and earthfill placement as part of the final cover. <br /> The earthworks CQA activities performed by Vector for the Stage lA closure <br /> construction included: <br /> monitoring of subgrade preparation; <br /> collecting samples of the earthfill material; <br /> • monitoring and testing of earthfill placement; and <br /> ® reviewing geotechnical laboratory testing result for compliance with <br /> project specifications. <br /> 4.1 Clearing & Grubbing <br /> The existing interim cover area was stripped of existing vegetation in <br /> preparation of the compacted earthfill. The material stripped from the closure <br /> area was stockpiled for later use. Vector's CQA Monitor continuously observed <br /> the removal process to insure the removal of topsoil. Vector's CQA Monitor <br /> notified the Contractor when additional removal of material was needed. The <br /> existing cover thickness was previously verified by others prior to construction. <br /> Steel plates were place in several of the areas to mark "existing grade". The <br /> locations of the steel plates were surveyed to be able to locate after <br /> construction to verify the 4 foot thickness was achieved. <br /> Vector Engineering, Inc. • 143E Spring Hill Drive•Grass Valley,CA 95945•(530)272-2448 <br /> -8- <br />