NORS Tunnel, Los Angeles, CA
Excavation by means of a digger shield TBM and EPB machine for the 48,000 ft of main line and diversion sewer tunnels and accompanying structures included tunneling through two areas of contaminated ground where special mining techniques and environmental precautions were necessary.

Our responsibilities included evaluation of claims, monitoring of excavation and construction, negotiation of change orders, design and inspection of chemical grouting for contaminated ground water, working with state and local agencies to obtain permits to excavate through contaminated ground, review of contractors' submittals and assistance to the owner.

MUNI Metro Turnback Project, San Francisco, CA
This project involved the excavation of two 840 foot, 18-foot diameter transit tunnels using compressed air, through fill material composed of sand and soft clay, with four zones that were chemically grouted.

We provided tunnel engineering and construction management, the responsibilities of which included all facets of tunnel, shaft, and chemical grouting: constructability review, submittal review, evaluation of claims, daily inspections, daily interface with contractor's project manager and superintendent, monitoring work progress, instrumentation monitoring and evaluation, safety, negotiation of change orders, verifying contractors, monthly progress invoices, monitoring and revising schedule, and preparing final as-built report.

Brushy Creek Interceptor, Round Rock, TX
Brushy Creek Regional Interceptor consists of approximately 7,000 feet of 110-inch initial diameter machine bored tunnel. The tunnel will be constructed in a stiff, expansive clay and a competent limestone. A complex fault zone marking the contact between the two formations will be crossed.

Brierley Associates and PBS&J designed the tunnel alignment and grade. Brierley Associates performed the geotechnical evaluation, prepared the Geotechnical Baseline Report, assisted in preparing the contract specifications, and prepared the initial tunnel support design, in addition to providing Construction Management services during the project construction.

South Austin Regional Wastewater Treatment Plant, Austin, TX
The Lift Station Interconnect Tunnel Project, part of a plan to expand and improve the South Austin Regional Wastewater Treatment Plant, consists of two tunnels and associated access shafts, the first of which is a 1,270-foot long, 60-inch diameter conduit that will allow water to flow between two lift stations, and the second is approximately 526 feet long with a finished diameter of 60 inches.

The owner, the City of Austin, contracted Turner Collie & Braden as the prime design firm, with Fugro South Inc. and Brierley Associates as sub-contractors to prepare the GBR, assist with the preparation of other contract documents, and provide on-site technical support during tunnel construction.