Featured Projects

PG&E Mokelumne River Water Quality/Water Temperature

S2S manages the water quality monitoring program for the Mokelumne River Hydroelectric Project, FERC Project No. 137/Condition No. 11. The water quality data are used, along with data from other resource investigations (water temperature, riparian zones, geomorphology, and fish, macroinvertebrate, and amphibian habitat), to determine the effect of project flow regimes on environmental resources. Collectively, data from these monitoring programs guide the regulatory agencies in setting appropriate flow regimes as specified under the continuous adaptive management program of the FERC license.

Project Details

Client: PG&E
Date: Ongoing
Location: Mokelumne River, Sierra Nevada Mountains

San Francisco-Oakland Bay Bridge Demolition Biological Monitoring

The California Department of Transportation replaced the eastern span of the San Francisco-Oakland Bay Bridge with a new bridge immediately to the north. S2S is providing biological monitoring support for the phased dismantling of the original span, which includes the implosion of submerged supporting piers. Monitoring includes bird and marine mammal surveys, including species of concern, and fish kill observation and collection.


Project Details

Date: Ongoing
Location: San Francisco-Oakland Bay Bridge

Moss Landing Stormwater Management

After PG&E built a 4.5-acre expansion of its Moss Landing facility to improve service and reliability, S2S was tasked with revising the company’s stormwater permit. We revised the risk calculation, which had been incorrectly assessed, ensuring that all future compliance tasks were in compliance with PG&E’s expectations and the requirements of the Construction General Permit. S2S took over BMP installation, maintenance, and removal services to ensure that the project would remain in compliance. BMPs installed on the site included check dams and fiber rolls.


Project Details

Client: PG&E
Date: Ongoing
Location: Moss Landing, CA

Carmel River Reroute and San Clemente Dam Removal Project

In its role as the principal project biologist firm, S2S permitted and agency-approved biologists conducted long‐term CRLF surveys, rescue and relocation of over 10,000 adult and larval CRLF and invasive bullfrog removals from the Carmel River Watershed, in association with the Carmel River Dam Removal Project in Monterey County‐ working under USFWS and National Oceanic and Atmospheric Administration (NOAA) guidelines and the project’s specific 10(a)(1)(A) recovery permit for CRLF.

The work included multiple years of nocturnal surveys from a canoe, kayak and on foot, capturing and handling of adult, sub‐adult, and young‐of‐the‐year CRLF, containment and relocations as per permit requirements, daytime surveys from water craft and on foot, CRLF egg mass surveys, habitat assessments, and extensive larval rescues and relocations to USFWS‐approved locations and associated reporting. 

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