Elkhorn Environmental Solutions
    Soil samples
    Closure Corner

    Proven Pathways to Site Closure

    At Elkhorn Environmental, we don't just investigate contamination—we close sites.

    "Closure Corner" showcases our success in achieving regulatory closure at complex environmental sites. Whether under RWQCB, DTSC, or local agency oversight, we specialize in developing efficient, data-driven strategies that move projects from uncertainty to resolution.

    1

    Understand the Site

    Characterize conditions and build the conceptual site model.

    2

    Define the Pathway

    Develop a practical path to cleanup and closure.

    3

    Obtain Stakeholder Buy-In

    Align clients, regulators, and project objectives.

    4

    Execute Efficiently

    Implement data-driven remediation strategies.

    5

    Achieve Closure

    Verify results and secure regulatory sign-off.

    What Sets Us Apart

    Most environmental projects stall due to unclear strategies, over-collection of unnecessary data, or misalignment with regulatory expectations. We focus on:

    Early identification of closure pathways

    (Low-Threat Closure Policy, risk-based closure, Land Use Covenant)

    Targeted data collection

    That eliminates uncertainty

    Regulatory alignment

    From day one

    Cost-effective remediation strategies

    That support closure

    Strong communication

    With agencies and stakeholders

    Representative Closures & Outcomes

    Dry Cleaner Sites — Chlorinated VOCs (PCE/TCE)

    Managed commingled PCE plumes from multiple source areas
    Implemented vapor mitigation, groundwater monitoring, and risk evaluation
    Achieved site closures under RWQCB oversight
    Reduced long-term liability and enabled property reuse

    Petroleum Hydrocarbon Sites (UST & Spill Releases)

    Managed gasoline releases including large-scale spills and leaking USTs
    Designed and implemented SVE and air sparging systems
    Removed thousands of pounds of petroleum hydrocarbons
    Achieved closure under Low-Threat UST Case Closure Policy

    Bay Area Commercial Site — Vapor Intrusion

    Led investigation and mitigation of chlorinated VOC impacts
    Designed and installed vapor mitigation system
    Coordinated with San Mateo County
    Achieved No Further Action (NFA) with deed restriction

    Alameda County Gasoline Spill (3,600+ Gallons)

    Directed full site characterization from surface release to bedrock
    Managed remediation strategy and regulatory coordination
    Advanced site to closure through the RWQCB regulatory process

    SCAP & Orphan Fund Projects

    Secured state funding for clients lacking resources
    Led full lifecycle: investigation → remediation → closure strategy
    Delivered meaningful environmental and community impact
    Environmental site work

    Our Closure Philosophy

    We approach every site with closure in mind from the beginning—not as an afterthought.

    What We Avoid

    ✕No unnecessary sampling events
    ✕No over-designed remediation systems
    ✕No wasted time or budget

    What We Deliver

    Data that supports decisions
    Strategies regulators will approve
    Solutions that align with your end goal

    Why Closure Matters

    Environmental closure isn't just a regulatory milestone—it's a business outcome.

    Unlock property value

    Remove liability

    Enable transactions and redevelopment

    Provide peace of mind

    Let's Close Your Site

    If you have a site that feels "stuck," we can help define a clear path forward. Contact us to discuss your project, review your data, and identify a realistic closure strategy.

    Discuss Your Site