WSP-CA-Landfill Gas Services

Projects

RECOLOGY HAY ROAD

Project Location: Vacaville, CA WSP has provided comprehensive landfill engineering services to Recology Hay Road for most of its disposal cell developments and operations. These services include landfill disposal cell and gas collection system (LGCS) design and construction quality assurance (CQA). Landfill Gas System Design: WSP designed a LGCS Master Plan to address future lateral expansion of Recology Hay Road through final closure grading. WSP also designs and implements multiple yearly LGCS construction phases to maintain continuous LFG emission and migration regulatory compliance for the existing Landfill footprint. These LGCS design phases typically include re-sizing or realigning LFG headers and subheaders to address operational requirements, adding vertical extraction wells and laterals, and leachate and condensate sump connections. WSP also designs and implements perimeter gas collection trenches adjacent to each cell liner to mitigate emissions from the slope leachate collection layers.

CQA and Construction Engineering Services: WSP provides construction engineering support and CQA services to Recology Hay Road for the periodic construction of both landfill disposal modules, LGCS expansions and other ancillary site works. Our services included: Agency plan checks of the construction documents; Solicit bids for construction, recommend award, and work with Recology’s procurement department to get contracts in place. Review construction staking and confirm the construction documents match the existing pre-construction conditions. Provide geosynthetics and earthworks inspection and laboratory services, and represent Recology as engineer-of-record during site construction.

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