Alameda County Natural Gas Transmission Pipeline Projects

R649, R700, and R707 Natural Gas Transmission Pipeline 131 Replacement Projects

PG&E replaced several segments of existing gas pipeline in Alameda County, spanning approximately 6 linear miles. The gas line replacement project areas (including access routes and staging areas) traversed sensitive habitats including alkali grassland, drainages, and rare plant habitat. Nomad conducted rare plant surveys and prepared a Vegetation Restoration Plan for the project.  Rare plants that were impacted include Livermore tarplant (Deinandra bacigalupii; State Endangered and CRPR 1B.1), Congdon’s tarplant (Centromadia parryi subsp. congdonii, CRPR 1B.1), and hogwallow starfish (Hesperevax caulescens, CRPR 4.2).

Rare plant surveys were conducted over 4 seasons. Rare plants in the project area include Livermore tarplant (Deinandra bacigalupii; State Endangered and CRPR 1B.1), Congdon’s tarplant (Centromadia parryi subsp. congdonii, CRPR 1B.1), San Joaquin spearscale (Extriplex joaquiniana. CRPR 1B.2) and hogwallow starfish (Hesperevax caulescens, CRPR 4.2).

Nomad coordinated with CDFW for approval of the Vegetation Restoration Plan and secured a Scientific Permit for seed collection. The Vegetation Restoration Plans included rigorous baseline studies and success criteria for restoration of alkali grassland habitats and rare plant populations. Nomad oversaw restoration implementation including seed collection of three annual species: Livermore tarplant, Congdon’s tarplant, and hogwallow starfish. A portion of the collected Livermore tarplant was seed banked at UC Berkeley Botanic Garden per the plan. Livermore tarplant seed was seeded directly on-site following project construction. Congdon’s tarplant, and hogwallow starfish were amplified at Hedgerow Farms and amplified seed was seeded on site.

Nomad is currently conducting post-construction annual monitoring the projects and providing recommendations as needed. Annual monitoring includes collecting vegetation cover data, mapping weeds, and surveying, counting, and mapping rare plant populations. Nomad prepares annual monitoring reports for submittal to CDFW that present data and identify if sites have met success criteria and can be closed out.


Project Location: North Livermore, Alameda County
Client: Pacific Gas & Electric

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