The following information is taken directly from Caltrans document FHWA-CA-EIS-83-14-FS, State Clearinghouse No. 83051706, otherwise known as the FINAL SUPPLEMENTAL ENVIRONMENTAL IMPACT STATEMENT / SUPPLEMENTAL ENVIRONMENTAL IPMACT REPORT (FEIS). The entire document is very large. This section covers only the material from Section 9 -- INVESTIGATE TUNNEL OPTION.

Copies of the entire FEIS can be obtained from Caltrans. Include a check for $13.


The original FEIS presented three alternative alignments with various design options to provide a safe and dependable highway in a geologically stable area between the Half Moon Bay Airport and Linda Mar Boulevard in the City of Pacifica. From these alternatives, the Federal Highway Administration and Caltrans selected as the preferred alternative the Martini Creek Alignment, a two-lane facility with an uphill climbing lane in each direction where grades are 6% or greater, as well as traffic safety design features. As a result of the NEPA lawsuit referenced within this document, the impact of estimated future project-generated noise must be restudied. This new study has been completed, and the purpose of this supplement document is to present the results of that study.

These pages are available both as text and as scanned images.

Here's the full text (minus the cover sheet).

And here are the pages as scanned images:

Cover sheet (66K)

Page 30 (133K) Planning inconsistency. Funding.
Page 31 (45K) Design considerations, safety, and cost
Page 32 (37K) Other tunnel considerations and responses
Page 33 (149K) Bypass & Tunnel Option Cost Analysis
Page 34 (46K)
Page 35 (128K)
Page 36 (106K)
Page 37 (18K) Long Single Bore Tunnel typical cross section