Supplemental Report: Archaeological Survey and Geotechnical Test Monitoring ofthe International Wastewater Treatment Plant Ocean Outfall Tunnel

摘要

Mariah Associates, Inc. continued archaeological survey and monitoring for theInternational Boundary and Water Commission, U.S. Section, for the location of the International Wastewater Treatment Plant and associated feeder pipeline alignments proposed for construction in the Tijuana River Valley in San Diego County, California. The following supplemental report involves the cultural resource survey and monitoring investigation of the on-land segment of the proposed Ocean Outfall tunnel which will connect with the International Water Treatment Plant and Land Outfall pipeline. The Ocean Outfall tunnel, designed to transport treated wastewater approximately 5 mi (8 km) out into the Pacific Ocean, will be excavated 165 to 185 ft (50 to 56 m) below the surface beginning at the end of the Land Outfall pipeline at the mouth of Goat Canyon. The geotechnical tests included air rotary drilling and hammer drop tests. No further archaeological work is recommended for this site.