Field Biologist; On-Call

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Bancroft Construction Services (BCS) provides environmental compliance, biological monitoring, and construction support services for public and private infrastructure projects throughout Los Angeles, Orange, and San Diego Counties. Our team works closely with construction managers, contractors, and regulatory agencies to ensure projects are completed efficiently while maintaining full compliance with environmental permits and regulations.

We are seeking an On-Call Field Biologist to support a variety of construction and infrastructure projects. This position is ideal for a motivated biologist who enjoys fieldwork, problem-solving in active construction environments, and working collaboratively with multidisciplinary teams.

This is an on-call, project-based position with variable hours depending on project needs.

The On-Call Field Biologist will be responsible for biological surveys, construction monitoring, and environmental compliance activities in accordance with federal, state, and local regulations. Responsibilities may include general and focused biological surveys, nesting bird surveys and monitoring, sensitive species monitoring, habitat assessments, and preparation of field documentation and reports.

The position requires the ability to work independently in the field, communicate effectively with construction personnel and project managers, and make sound, real-time decisions to maintain regulatory compliance.

• Conduct general biological reconnaissance surveys, habitat assessments, and focused (including protocol-level) surveys for special status plant and wildlife species (e.g., CA gnatcatcher, least Bell’s vireo, burrowing owl, San Diego cactus wren, Quino checker spot butterfly, Stephen’s kangaroo rat, arroyo toad, fairy shrimp, bats, etc.)
• Perform nesting bird surveys and monitoring; identify species and nesting behaviors by sight and sound in compliance with applicable buffer requirements and permit conditions
• Conduct biological and environmental compliance monitoring during active construction activities
• Coordinate with construction crews, superintendents, and project managers to ensure compliance with biological permit conditions and environmental commitments
• Complete pre-construction surveys and daily monitoring documentation
• Provide environmental awareness and sensitive species education to construction personnel
• Accurately collect field data, photographs, GPS points, and monitoring observations and submit daily reports
• Assist with data entry, organization, and management of biological records
• Interpret and apply biological permit conditions, regulatory documents, and agency approvals
• Communicate field observations, compliance concerns, and schedule availability to project managers and senior biologists
• Perform other field or office support tasks as assigned

• Bachelor’s degree in Biology, Ecology, Environmental Science, or a closely related field
• Minimum of 3+ years of professional experience in biological surveys, biological consulting, or construction/environmental monitoring
• Valid driver’s license with a satisfactory driving record and access to a reliable vehicle

• Strong familiarity with Los Angeles, Orange, and San Diego County wildlife and plant species
• Experience working with special-status species (federal or state listed, candidate, or sensitive species)
• Familiarity with CEQA, NEPA, CESA, and FESA requirements
• Experience using GPS units, Survey
  123, ArcGIS, Arc Collector, or similar field data collection tools
• USFWS 10(a)(1)(A) permit or similar authorizations (preferred, not required)

• Long hours in outdoor environments and temperature extremes
• Walking or hiking on uneven terrain while carrying field equipment
• Working in active construction sites around heavy equipment
• Occasional travel throughout Los Angeles, Orange, and San Diego Counties
• Candidates must be physically capable of performing required field duties safely.

• Hourly…