The Project: TL 698C Relocation for Palomar College Campus Housing Development

Location
San Diego County, CA

Project Aim
Relocating an existing transmission line around a housing development.

Our Role
NWB monitored for cultural resources in the project area to support SDG&E, ensuring avoidance and minimization of impacts to cultural resources. A Native American monitor was present for all construction activities.

San Diego Gas & Electric (SDG&E)

The Project: TL 6975 Escondido to San Marcos New 69kV TL Environmental Constraints Field Surveys

Location
San Diego County, CA

Project Aim
Preliminary design phase of a proposed project to construct and operate an approximately 12-mile 69 kV transmission line (TL 6975) between the existing SDG&E Escondido and San Marcos Substations.

Our Role
NWB conducted a cultural resources constraints survey and archaeological survey of the proposed project area to support SDG&E in the preliminary engineering design process, offering monitoring and access route recommendations that ensure avoidance and minimization of impacts to cultural resources.

The Project: San Diego Gas & Electric (SDG&E) Fire Management program (FiRM)

Location
Multiple locations throughout San Diego County, California

Project Aim
SDG&E’s project aim is to replace existing wood utility poles with new steel poles, enhancing the safety and reliability of the distribution system while reducing costs and environmental impacts for future maintenance activities.

Our Role
NWB assists SDG&E in avoiding negative impacts to cultural resources near pole locations by monitoring ground disturbance activities and surveying the area of potential effects (APE) prior to construction. NWB produces cultural assessments based on archaeological surveys or monitoring activities.

The Project: Mid-Coast Trolley Project

Location
San Diego County, California

Project Aim
SANDAG Mid-Coast Trolley Expansion project to extend the existing trolley line north from Old Town San Diego to the University Town Center residential and commercial area north of CA-52. Extensive utility work will take place during the course of this project, including maintenance, installation, and operation of electric transmission, electric distribution, gas lines, and staging areas.

Our Role
NWB produces cultural assessments with the results of archaeological surveys or monitoring activities. We assist in avoiding negative impacts to cultural resources near utility work locations by monitoring ground disturbance activities and surveying the area of potential effects (APE) prior to construction. Our archaeologists have MTS San Diego and North County Transit District (NCTD) railroad safety certifications.

The Project: Ocean Ranch Substation Installation

Location
San Diego County, California

Project Aim
Construction of a new SDG&E substation to improve substation and circuit reliability, support customer growth, and decrease service disruption to existing customers in the Oceanside and North Vista service territory.

Our Role
NWB conducted a cultural record search, analysis, survey, technical report preparation, tribal and agency consultation, construction monitoring, and further measures for California Environmental Quality Act (CEQA) and Section 106 compliance. Site development included topographical survey and aerial of the project site, geotechnical engineering support, approximately 2 acres of site development for a 69/12KV pad, minimal retaining walls as needed, a storm drain system and connection to existing detention basin, 1,100 linear feet of masonry block screening walls, and 27,100 square feet of access roads.

The Project: SDG&E—C221 FiRM Volcan Mountain

Location
San Diego County, California

Project Aim
Installation of 5 new metal utility poles, retirement of 4 existing poles, and replacement of 91 wood poles with new metal poles. The process consisted of excavating new pole holes with hand tools including shovels and hydraulic jackhammers. Replacement steel poles were placed into new holes, and a new conductor was strung between the poles.

Our Role
NWB performed construction monitoring and produced a cultural assessment to assist SDG&E in avoiding impacts to cultural resources.

Unique Challenges
During this project, we faced several delays due to weather and a high fire danger. We also navigated previously unknown vertical deposition and the presence of recorded sacred sites in the area of potential impact. A Native American monitor was present for construction activities.

The Project: Archaeological Monitoring and Mechanically Excavated Trench (MET) Testing for SDG&E's Poway Substation Rebuild

Location
Poway, San Diego County, California

Project Aim
Project work included installation of a fence, excavation of geotechnical borings using a portable drilling/boring rig, and the excavation of numerous METs and percolation pits.

Our Role
NWB performed archaeological monitoring, testing, and cultural assessment to assist SDG&E in avoiding impacts to cultural resources. NWB custom-made a mechanical screener used for testing 15 mechanically excavated trenches. A Native American monitor was present for all construction activities.