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Environmental Site Assessment & Due Diligence
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Due Diligence for Real Estate Developer Portfolio in Washington, DC

Working in-house and on-call, Northgate provides environmental due diligence and management services to the largest developer in the Washington DC metropolitan area. Northgate works closely with senior management to advise company personnel regarding environmental conditions and environmental risk for their entire property portfolio and for prospective properties being evaluated during acquisition due-diligence. Services include defining work scope and/or performing environmental audits/assessments and remediation projects in connection with proposed acquisitions, dispositions, financing, leases, and current property holdings. Additional services include reviewing and analyzing environmental data and reports, monitoring environmental services performed by others, provide emergency response or crisis management for environmental issues (e.g. abandoned USTs, releases/spills, and/or asbestos containing materials) on behalf of property managers. Northgate also provides consulting services in connection with construction and redevelopment managers, insurance and litigation support managers, and provides environmental in-house training to staff as requested.

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MarketCenter Railyard Redevelopment

San Jose

Northgate performed rapid site assessment, site characterization studies, and remediation services during the redevelopment of a 40-acre former railyard in San Jose, California. The property was redeveloped as San Jose MarketCenter, a mixed-use shopping center. Northgate prepared a complete evaluation of options and associated costs for excavation and treatment or disposal of impacted soil. Northgate subsequently prepared a Risk Management Plan for the site with the ultimate goal of maximizing reuse of soil and minimizing offsite disposal. A sophisticated soil segregation and re-allocation technique enabled the successful reuse of a significant portion of site soils, thereby minimizing disposal volume, costs, and trucking impacts. Engineered caps and passive vapor mitigation systems were also incorporated into the construction design. Northgate developed an Operation and Maintenance Manual that currently serves as a guidance document for MarketCenter employees and tenants. Northgate successfully negotiated site closure and obtained a finding of No Further Action (NFA) for the site. In addition, the use of a risk-based mitigation program and integration of remediation with development ultimately reduced cleanup costs by over $30M.

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As-Needed Environmental Services

Santa Clara Valley Transportation Authority

Under contract with the Santa Clara Valley Transportation Authority (VTA), Northgate performs environmental investigations, serves as a regulatory liaison, provides construction monitoring and reporting services, and conducts remediation cost estimating in support of the BART extension from Fremont to San Jose. Northgate has completed Phase I and II Environmental Site Assessments (ESAs) conforming to ASTM standards on over 25 individual properties. The ESAs are used by the VTA to negotiate purchase prices for the properties that the VTA will acquire or lease as part of the extension and to prepare contingency plans for managing contaminated materials during construction. Individual projects have included extensive testing and analysis for lead and arsenic in shallow soil along existing rail line rights-of-way, evaluating onsite and offsite soil reuse and disposal options, and preparing engineering estimates of contaminated soil volumes based on historic investigations and documents. Other work has included soil quality testing for evaluation of potential contamination exposure to construction workers at the VTA bus maintenance facilities, evaluation of underground storage tank (UST) releases, and sediment and floodplain analysis.

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As-Needed Environmental Services

City of Oakland

Northgate provides the City of Oakland with environmental services under an as-needed contract. Northgate has provided a wide range of services under this contract, including environmental investigations in support of Brownfields redevelopment, storm water management and modeling, water quality planning and analysis, and energy efficiency consulting. Northgate also performs site surveys, environmental site assessments, restoration site prioritizing and planning, and design development services for waterway restoration.

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Former Almaden Air Force Station Redevelopment

Mt. Umunhum Open Space and Park

The Former Almaden Air Force Station, purchased from the Department of Defense in the 1980s, is currently undergoing environmental investigation and cleanup of contaminants in preparation of its transition to publically-accessible open space and park land. Located within the Sierra Azul Open Space Preserve, Mt. Umunhum is a prominent Bay Area landmark, and is envisioned to be a significant recreational destination. Northgate oversaw a series of engineering and hazardous materials studies to support the Midpeninsula Regional Open Space District's planning efforts and CEQA/NEPA requirements. Studies included hazardous materials surveys of several abandoned buildings, a structural survey of the five-story Radar Tower, a slope stability investigation at the Radar Tower site, a cultural and historical assessment survey of the former Air Force Station, and soil sampling and analysis to assess environmental contamination. Northgate reviewed the investigation and cleanup work being completed by the US Army Corps of Engineers and represented the District's interests in communications with the Corps and state regulatory agencies. Northgate also assisted the District with engineering studies including structural analysis, rock slope stability analysis, serpentinite geologic mapping, hazardous materials studies, and soil characterization for lead, asbestos, and pesticides. We leveraged our experience with environmental issues on lands being converted from military or industrial uses to parks and ecological preserves to support the District in its mission to acquire and manage land for wildlife habitat and to provide safe and educational public access to these lands.

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Hazardous Substance Liability Assessments

Santa Clara Valley Water District

Northgate has performed multiple Hazardous Substance Liability Assessments (HSLAs) for the Santa Clara Valley Water District. The purpose of a HSLA is to reasonably evaluate the potential for, or the actual impact of, past practices on a given property. The services provided by Northgate include reviewing readily available information regarding the site history, reviewing chain-of-title documents, reconnaissance of the site and vicinity, reviewing regulatory agency publications and files, and evaluating the Recognized Environmental Conditions. The HSLAs are used by the Santa Clara Valley Water District to evaluate sites for possible acquisition as part of its flood control projects.

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Environmental Investigation & Characterization
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ESA and Voluntary Cleanup for Portfolio of Shopping Centers

Northgate performed Voluntary Cleanup Program (VCP) environmental site assessments and subsurface investigations for the anchor tenant at three shopping centers in connection with property acquisitions in Maryland and Virginia. Each case consisted of a multi-tenant commercial shopping center developed with numerous commercial buildings. Each Phase I ESA revealed several recognized environmental conditions (RECs) associated with historical operations, such as dry cleaning, printing operations, medical offices, restaurants, automotive services, and gas stations. Offsite releases had contributed additional impacts to soil, soil vapor, and groundwater at all properties. To qualify for the VCP program, Northgate performed indoor air and soil vapor studies to evaluate the potential for vapor intrusion. A sub-slab depressurization system was installed at one shopping center in Maryland. Investigations were performed to the satisfaction of regulators, including Maryland Department of the Environment (MDE) and Virginia Department of Environmental Quality (VDEQ).

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Future Hospital Site Brownfields Redevelopment

Working within the framework of an Environmental Agreement with the prior and future property owners and a Prospective Purchaser Agreement with the San Francisco Bay Regional Water Quality Control Board, Northgate led the investigation, demolition, and remediation of an 18-acre former electronics research and manufacturing facility. The property was impacted with organic solvents, heavy metals, and petroleum hydrocarbons. Northgate provided oversight for the hazardous materials closure of the former manufacturing facilities, including the RCRA-permitted wastewater treatment plant and chemical storage areas. Demolition work included the removal of all underground utilities and abatement of more than 200 tons of asbestos-containing material and lead-based paint from four buildings encompassing 330,000 square feet. Stringent oversight and segregation practices resulted in approximately 99% of the building demolition debris being recycled. Northgate also prepared the Remedial Action Plan for the property, and conducted the cleanup of contaminated soil gas, soil, and groundwater. Northgate was able to segregate and reuse 80% of the 100,000 cubic yards of affected material at the site as a result of detailed characterization and onsite treatment processes. Northgate successfully remediated the site to unrestricted use standards, facilitating the property's redevelopment as a hospital and medical center.

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Fort Pickett Range Cleanup and Renovation

Blackstone, Virginia

Northgate investigated and removed munitions and explosives of concern (MEC) from a 2,000-acre area as part of the renovation of Range 15 at Fort Pickett in Blackstone, Virginia. Northgate conducted an environmental site assessment of the facility in preparation for remediation activity. The assessment included records review, personnel interviews, and field surveys for MEC and chemical agents. Northgate mapped the property and conducted surface sweeps of the 730-acre construction area, and cleared the surface and subsurface of the 156-acre cut/fill construction area to a depth of 4 feet. The clearance area included munitions disposal sites and target placement areas. Northgate removed several target backstop berms and mobile target rail track systems. We safely recovered and disposed more than 1,500 hazardous MEC items ranging in size from 20 mm to 106 mm. Munitions clearance activities were accomplished without compromise to either planned construction activities or explosive safety standards.

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Upper Guadalupe River Environmental Remedial Action Plan

Santa Clara Valley Water District

This three-acre property was acquired by the Santa Clara Valley Water District to construct a flood control ch...

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Upper Guadalupe River Environmental Remedial Action Plan

Santa Clara Valley Water District

This three-acre property was acquired by the Santa Clara Valley Water District to construct a flood control channel for the Guadalupe River. On behalf of the District, Northgate identified and confirmed the appropriate lead regulatory agency for the site, and facilitated enrollment in a Voluntary Cleanup Program. Northgate also prepared a Site Investigation Summary Report, researching and synthesizing historical soil and groundwater analytical results, and a Risk Analysis and Assessment Report, evaluating the risk to human health from residual soil and groundwater contamination. Additional evaluations and reports to be completed include a Remedial Action Plan, Plans and Specifications for remedial actions, and a Remedial Construction Completion Report.

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Wetlands Restoration

Yosemite Slough, Candlestick Point

The Yosemite Slough wetland restoration is the centerpiece of a long-term project to clean up contamination, restore tidal wetlands on filled lands, and improve habitat quality of associated transitional and upland areas on Candlestick Point in San Francisco. The restoration design provides public shoreline access, wetlands and wildlife habitat, bird nesting islands, transitional and upland buffer areas for sensitive habitats, interpretive trails, and an education center. Northgate conducted a remedial investigation and feasibility study, mapped the distribution of contamination using soil sampling combined with a geographic information system (GIS), and developed an environmental model. Detailed data visualizations facilitated negotiation of risk-based cleanup levels with the San Francisco Bay Regional Water Quality Control Board. The remedial strategy relies on detailed characterization and excavation of over 230,000 cubic yards of fill, and careful segregation, management, and reuse of onsite soil to reduce chemical concentrations in wetland cover soils to near-ambient sediment concentrations. While most of the soil met action goals, the soil associated with an underground storage tank and former metals fabrication facility exceeded the action goals for total lead for onsite reuse. Northgate stabilized this stream with onsite treatment to reduce lead solubility to below toxicity characteristic leaching procedure (TCLP) levels, tested the soil to confirm waste characterization, and disposed of the material offsite at a licensed landfill. Northgate also provided geotechnical engineering analysis, developed bid specifications for contractor selection, provided construction compliance monitoring, and participated in public outreach activities.

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Environmental Characterization and Investigation for Utilities Company

Northgate provides environmental site assessment and remediation services at former Southern California Edison generating stations under regulatory direction of the Department of Toxic Substances Control. The services support remediation of surface impoundment excursions in both soils and groundwater under mandate of a Final Judgment pursuant to Stipulation, handed down by the Superior Court of California, Los Angeles County. Northgate implements remediation programs as prescribed in approved closure plans, maintains and decommissions monitoring networks, updates and optimizes Work Plans and Sampling and Analysis Plans, provides data management, and supports the client with planning and regulatory negotiations. Through careful data analysis and close coordination with the client and regulator, Northgate has been able to reduce the monitoring requirements at three generating stations while simultaneously optimizing sampling procedures and location access.

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Environmental Remediation & Engineering
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Investigation and Remediation of a Former Dry Cleaning Facility

Northgate planned a phased soil, soil vapor, and groundwater investigation to characterize a site impacted from 40 years of use as a dry cleaning facility. Rapid, high-density characterization tools led to targeted, detailed sampling, and then installation of a multi-level well field to facilitate a detailed, 3D understanding of subsurface conditions. Using the 3D model and hydrostratigraphic cross-sections, Northgate designed a Remedial Action Plan to aggressively address the PCE source in soil and groundwater. The remedial approach included in-situ thermal remediation of source area soil and groundwater, and in-situ enhanced reductive dechlorination using emulsified zero-valent iron (EZVI) for dissolved plume groundwater remediation. The thermal system successfully attained cleanup goals within one year. The groundwater remediation program has achieved and sustained remedial action objectives for 4 years and monitoring is ongoing. PCE mass flux from the site has been reduced by an estimated 80% to 99%. Northgate implemented a remedial action in the offsite portion of the groundwater plume in 2017 and is currently monitoring the results.

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Brownfield Remediation and Redevelopment at Former Wood Treatment Facility

Northgate designed an investigation and remediation approach to integrate with construction of a 250,000 square foot cold-storage facility at a former wood treatment site at the Port of Long Beach. Soil was impacted with pentachlorophenol (PCP), metals, VOCs, and dioxins/furans, and tidally-influenced groundwater was impacted with PCP and petroleum hydrocarbons. Several oil wells and an abandoned pipeline corridor were also present and methane was detected in soil vapor above action levels. To limit client liability for unknown or unforeseen environmental liabilities, Northgate worked with the client to negotiate an AB 389 Agreement with the DTSC under California’s Land Reuse and Revitalization Act (CLRRA). The selected remedy consisted of monitored natural attenuation for groundwater and a multi-component, RCRA-equivalent cap for soil that incorporates a sub-slab passive methane and VOC mitigation system. Northgate successfully streamlined the regulatory process by aggregating the remedial work plans and securing agency approvals on components of site construction concurrent with development of a single Remedial Design Document.

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Soil Remediation, Former Oakland Army Base

Oakland Base Reuse Authority

Northgate prepared support plans and provided construction monitoring, sampling services, and waste characterization for soil remediation at the former Oakland Army Base. The project site was a former oil reclamation plant for the military base, and used an acid-clay refining process that generated acidic sludge and spent clay contaminated with petroleum residuals and metals. The remedial action plan, approved by the California Department of Toxic Substances Control (DTSC), consisted of excavation and onsite treatment of the acidic organic residue to reduce the mobility of lead and other underlying hazardous constituents, and to minimize the amount of material that must be treated and disposed offsite. Northgate prepared support plans for the excavation (involving soil treatment, transportation, health and safety, stockpile management, decontamination, and storm water pollution prevention), performed noise monitoring, provided oversight of stockpile management, and conducted sample collection, analysis, and validation. The DTSC certified completion of the remedial actions in 2009.

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Wetlands Restoration and Corrective Action Plan

Sears Point

The Sears Point Wetland Restoration Project encompasses more than 2,300 acres of agricultural land owned by the Sonoma Land Trust (SLT), which is restoring the area to tidal wetlands. The former shooting range contains sediments contaminated with lead and polycyclic aromatic hydrocarbons. Northgate defined contaminant distribution and quantified residual lead concentrations in surface and shallow soil and groundwater. We used characterization data to evaluate potential impacts to wetland flora and fauna and to develop cleanup criteria for ecological protection. Northgate developed and evaluated remedial alternatives consistent with the future wetlands scenario, working closely with wetlands scientists, stakeholders, and the San Francisco Bay Regional Water Quality Control Board. We prepared a Corrective Action Plan, approved by the Water Board, which specifies removing contaminated material from the sensitive area and using it as borrow material in upland perimeter levees. This cost-effective solution provides material for levee construction, removes contaminated material from sensitive habitats, and lowers the site elevation to suitable levels for tidal wetlands development.

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Remediation and Engineering for Southern California Edison

Northgate provides remediation design, implementation, and post-construction monitoring on an on-call basis to Southern California Edison (SCE). Northgate has prepared closure plans for surface impoundments, negotiated with regulatory agencies, implemented remediation programs, and performed post-construction evaluations to confirm that design criteria have been met. Northgate also provided engineering services for removal and replacement of SCE power poles built on an engineered cover for a former landfill containing a variety of hazardous wastes that were encroaching onto a major artery right of way. Remediation and engineering services have also included: preparation of RFI work plans, development of remediation programs and closure plans, engineering cost analyses, subcontractor selection and management, coordination with current property owners, decommissioning and realignment of monitoring networks, and regulatory coordination and negotiation.

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Hydro/Geologic Studies
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Hard Rock Quarry Water Resources Assessment

Northgate performed a water resources assessment in support of the proposed expansion of a hard rock quarry. The quarry property overlies a complex fractured rock aquifer along a river and between three large fault zones. The river's close proximity to the quarry makes understanding surface water-groundwater interaction of critical importance. Naturally occurring levels of salts, metals, and other chemicals in local groundwater exceeding certain regulatory standards were also of concern. Northgate's primary objectives were to characterize groundwater seepage conduits that may intercept the pit, quantify seepage originating from the river and other recharge areas by developing a 3D MODFLOW groundwater model, and to test alternative grading and dewatering plans. Northgate also provided hydrogeologic assessment, geophysical surveying, pollution analysis, and data management and interpretation using 3D geographic information system (GIS) visualization.

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Environmental Assessment and Remediation at former King’s Court Dry Cleaners, Los Gatos, California

Northgate has provided a full array of professional services to characterize and clean up PCE contamination at...

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Environmental Assessment and Remediation at former King’s Court Dry Cleaners, Los Gatos, California

Northgate has provided a full array of professional services to characterize and clean up PCE contamination at this former dry cleaning facility that operated for 30+ years from the 1950s until the 1980s. Comprehensive hydrogeologic and geologic assessments were performed to characterize subsurface conditions, including the magnitude and distribution of PCE in the unconfined aquifer 40 feet below the ground surface. PCE in the vadose-zone soil gas was characterized for potential vapor intrusion into the overlying commercial shopping center. Over a 20-year period of investigation, remediation, and monitoring, Northgate staff designed, installed, and operated a groundwater extraction and treatment system, two soil vapor extraction and treatment systems, a groundwater monitoring network, and a passive sub-slab venting system, and optimized the use of the HVAC system as an engineering control for indoor air quality. Remedial actions effectively removed more than 90% of the contamination, reducing the potential health risks to acceptable levels for commercial land-use. Residual low-level PCE in groundwater and soil gas is stable and naturally attenuating. The site is being currently being considered for low-threat case closure by the Water Board.

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Conceptual Site Model Development for Commingled Plume

Northgate developed a comprehensive Conceptual Site Model (CSM) to describe the lateral and vertical extent of chlorinated solvent impacts beneath and in the vicinity of a former military housing area that is adjacent to a creek in a bay margin setting, and both upgradient and downgradient of other chemically impacted sites, including multiple Superfund sites. Northgate designed data management and visualization methodologies to incorporate subsurface lithology, groundwater chemical and elevation data, soil vapor data, and current and abandoned subsurface utilities into a series of GIS visualizations and 3D models. Thousands of data records were merged into a common geospatial database structure, from which Northgate performed geostatistical modeling of potentiometric surfaces, lithologic units, and several commingled, multi-chemical contaminant plumes from multiple responsible parties. The CSM specifically addressed the question of whether unconfirmed “upgradient sources,” including Superfund sites, a dry cleaner, service station, former vector control yard, and other private businesses, could be contributing to contamination in groundwater beneath the former military housing area.

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Investigation and Remedial Planning

Driscoll Ranch

Driscoll Ranch is a key landholding of the Midpeninsula Regional Open Space District, whose planned expansion of the adjacent La Honda Creek Open Space Preserve includes the 3,600-acre Driscoll Ranch, creating one of the largest regional ecological preserves on the San Mateo County coastline. Northgate helped the District develop and implement a strategic plan to add Driscoll Ranch to the preserve, and provided remedial planning and a detailed site investigation for contamination related to historical uses, including oil drilling and cattle ranching. Northgate developed site-specific cleanup levels for soil contaminated with petroleum hydrocarbons, polycyclic aromatic hydrocarbons, and pesticides, and developed a Site Management Plan to permit safe public access to the ecological preserve. We concluded that environmental conditions would not pose a risk to groundwater, surface water, or the health of visitors at the future ecological preserve, and that residual impacts be managed in-place through administrative mechanisms, avoiding costly remedial measures and expediting property access. The San Francisco Bay Regional Water Quality Control Board approved the Soil Management Plan and issued a "No Further Action" letter.

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Specialized Groundwater Monitoring Services for San Francisco Public Utilities Commission

Northgate provides water resources program support and hydrogeologic assessments for the SFPUC in lieu aquifer...

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Specialized Groundwater Monitoring Services for San Francisco Public Utilities Commission

Northgate provides water resources program support and hydrogeologic assessments for the SFPUC in lieu aquifer storage and recovery (ASR) program for the Westside Basin in San Francisco and San Mateo Counties. Services include supporting the groundwater monitoring program (which includes over 100 monitoring wells with depths up to 750 feet), groundwater supply well protection assessment, land subsidence assessment and monitoring, down-well instrumentation maintenance and installation, monitoring well repair and maintenance, geophysical services, well abandonment, and water level and saltwater intrusion monitoring. Other as-needed services have included water in storage assessment, groundwater contaminant fate and transport model assessment, and telemetry feasibility assessment.

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Hazardous Materials & Waste Management
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Black Mountain Industrial Complex Investigation and Soil Remediation

Northgate completed several soil, groundwater, and indoor air investigations at a 450-acre industrial facility within the Black Mountain Industrial Complex in Henderson, Nevada. This active industrial facility was the world's largest magnesium production plant during World War II and was later used for a variety of other manufacturing activities, resulting in extensive soil and groundwater impacts from heavy metals, perchlorate, pesticides, chlorinated solvents, radionuclides, and other chemicals. Northgate rapidly mobilized and managed a team of staff and subcontractors to remove approximately 800,000 cubic yards of soil from the site under an accelerated schedule. Northgate also performed comprehensive environmental and health risk assessments related to groundwater-to-surface water impacts, plume capture and control, vapor intrusion, potential leaching of residual chemicals from soil to groundwater, and vadose-zone remedial alternatives. As part of our comprehensive analyses, Northgate developed and calibrated a regional three-dimensional groundwater model with an areal extent of over 10,000 acres, which was centered on the 450-acre industrial facility and encompassed the remediation systems of multiple responsible parties and outflow to the Las Vegas Wash, a tributary to Lake Mead. The model, developed using MODFLOW, is a valuable and efficient tool for evaluating plume capture from three groundwater extraction systems, optimizing our client's existing system to enhance capture and reduce operations/maintenance costs, and making recommendations for future remedial enhancements.

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Investigation and Remediation

Former Braito Landfill, Benicia, California

Northgate performed comprehensive assessment and remediation of an approximate 60-acre residential development that had been partially constructed over a former landfill. Northgate's work, which began when refuse surfaced in residential backyards, included complete evaluation of historic land use, including review of facility operating records, development and implementation of a detailed characterization plan, evaluation of human health and environmental health risks, and implementation of site cleanup. Northgate prepared excavation, shoring, and underpinning plans, as well as remediation monitoring and contingency plans to ensure safety of nearby residents. Northgate performed soil gas extraction and treatment, in-situ stabilization of buried wastes, storm water management, and offsite transportation and disposal of hazardous and non-hazardous wastes. Northgate saved our client over $2M in disposal costs by using an innovative statistical analysis to establish that the majority of the waste could be classified as non-hazardous, and treating hazardous wastes to become non-hazardous. Northgate also developed and implemented public participation programs, and participated in Community Advisory Group meetings, workshops, and various agency meetings. Northgate negotiated final cleanup levels, and worked with our client's attorneys to prepare final documents, disclosures, and deed restrictions for the site following remediation. Northgate received a special recognition award from the City of Benicia following successful completion of the project.

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Environmental and Geotechnical Engineering Services

Mission Bay Loop Light Rail Extension

Construction of the Mission Bay Loop Extension of the Third Street Light Rail is subject to the Maher Ordinanc...

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Environmental and Geotechnical Engineering Services

Mission Bay Loop Light Rail Extension

Construction of the Mission Bay Loop Extension of the Third Street Light Rail is subject to the Maher Ordinance of the San Francisco Health Code, which governs construction in areas of known historical landfill. Northgate prepared an Environmental Site History Report and Soil Sampling Work Plan, which were approved by the San Francisco Department of Public Health. We reviewed site history, performed site reconnaissance, conducted reviews with regulatory agencies, developed a soil sampling program to characterize the soil to be excavated, and prepared the Maher Ordinance Application for the San Francisco Department of Public Works. Northgate also performed concurrent geotechnical and environmental investigations to identify hazardous chemicals in soil and determine potential environmental or human health and safety risks during construction. When chemical concentrations exceeded regulatory screening levels, Northgate prepared a Site Mitigation Plan describing construction management procedures to mitigate worker and public exposure during construction and recommending waste management and disposal options for construction-generated soils.

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Hazardous Materials Management Services for the City of Berkeley

As part of a multi-year service agreement, Northgate provides hazardous materials management services to the City of Berkeley Department of Public Works. Services include performing annual Hazardous Materials Business Plan updates in accordance with California Health and Safety Code Division 20, Chapter 6.95, Section 25500 at seven city-owned facilities including the Public Safety Building, the City Transfer Station, and the Public Works Corporation Yard. The annual updates include documenting the facility chemical inventory, emergency response plans and procedures, reviewing training program requirements, and updating site plans showing chemical handling and storage areas, sewer drains, access and egress areas, emergency shutoffs, evacuation staging areas, and emergency response equipment. Northgate reports updated plan information on the California Environmental Reporting System (CERS) system on the city’s behalf.

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Former Benicia Arsenal Chemical and Munitions Cleanup

Benicia, California

Northgate served as the program manager, lead engineer, and contractor to clean up and restore the Tourtelot Property (a portion of the former Benicia Arsenal) for future residential development and to provide open space and wetlands. Northgate developed a remedial exit strategy, prepared remedial investigation documents (RI/FS, RAP), remedial design documents, and bid specifications, and remediated soils impacted with munitions and explosives of concern (MEC). We conducted human health and ecological risk assessments for explosives and chemically-affected areas following remediation to verify that residual levels of explosives and other constituents were protective of human health and the environment. Northgate was the key regulatory liaison and successfully obtained a "No Further Action" regulatory decision for the site—the first MEC site in California to receive regulatory approval of unrestricted residential development. Northgate continues to provide operation and maintenance services related to surface water and wetlands mitigation monitoring.

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PG&E Hazardous Materials Program Supportn

Northgate supports Pacific Gas & Electric’s (PG&E’s) Hazardous Materials Program by processing permit renewals for 49 of the 83 certified California Unified Program Agencies (CUPA) with jurisdiction over PG&E’s approximately 1,300 permitted facilities. On behalf of PG&E, Northgate processes the annual permit fees and works with PG&E's environmental facility staff to review then distribute the renewed permits for posting onsite. Throughout the year, Northgate communicates with local CUPA agencies on permit-related issues, and works together with PG&E’s staff to update the Hazardous Material Business Plan (HMBP) information in the state’s California Environmental Reporting System (CERS) when needed. Northgate’s support of PG&E’s Hazardous Materials Program helps to ensure our client’s compliance with state and federal regulatory requirements.

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Geospatial & Web Services
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Environmental Impact Review

Former Paint Manufacturing Facility

Northgate provides environmental consulting services at a former paint manufacturing facility located in Los Angeles County. Previous investigations identified contaminants in soil vapor, dissolved in shallow groundwater, and as a layer of light non-aqueous phase liquid (LNAPL). Remedial actions to mitigate chemical impacts have been underway since 1987, initially through product removal by mechanical means, and subsequently with the installation of a soil vapor extraction (SVE) and bioventing system to remove product and stimulate biodegradation of residual source-zone contaminants. Northgate conducted a review of the remedial system and provided recommendations for immediate action to eliminate threats to underlying aquifers. Northgate is now working with the responsible party to reduce current and long-term operating costs by optimizing the existing SVE system and using a risk-based approach to evaluate performance benchmarks and identify a path to closure.

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Air Quality Web Portal for Oakland Army Base Redevelopment

Northgate developed an Air Quality Monitoring Program to track ambient air in the West Oakland community as the former Oakland Army Base is redeveloped. Initiated in 2013, the monitoring program includes three PM2.5 monitors, an automated sample collection system for elemental carbon, and a meteorological station. Hourly PM2.5 data are automatically transferred from the monitors’ internal data loggers via cellular modems to an offsite MS SQL Server database on an hourly basis. After a short delay for quality control checks, PM2.5 and meteorological data are then pushed to a web portal that provides real-time monitoring data distribution, analysis, and visualization in easy-to-understand interactive maps, charts, and graphs accessible to the public, project stakeholders, and regulatory agencies. Raw and averaged data, reports, and schedules are available to download, and the public can submit questions and comments for the project team. This simple and intuitive interface allows those living in West Oakland to more easily stay informed on the air quality conditions and trends in their community.

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Work Order and Asset Management Mobile GIS Application

Working as part of a consultant team providing as-needed GIS services to Alameda County, Northgate developed a GIS based mobile web application for use by the Public Works Maintenance and Operations (M&O) Department for management and tracking of work orders, asset inspections, and for developing and maintaining a GIS-based asset inventory. The application integrates directly with the Public Works’ Maintenance Management System and provides the M&O Department’s 200 employees with an intuitive map-based interface for managing and tracking work orders and asset inspections, and gaining access to a comprehensive inventory of all road and flood control assets, property parcel info, rights of ways, and easements. Editing features allow for field staff to add and edit asset inventory data and locations directly in the field. Supporting documents, such as easement agreements and as-built drawings, can be accessed via integration with the County’s document management system. The application was developed using a combination of ArcGIS Portal for Server, ArcGIS Web AppBuilder Developer Edition, the ArcGIS Javascript API, ArcGIS Server, ArcSDE geodatabase, and Microsoft SQL Server, in integration with the County’s enterprise MaintStar work order and asset management system.

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County Assessor’s Office Mobile GIS Canvassing Application

Northgate application developers, working as part of the consultant team providing as-needed GIS services to Alameda County, developed this award winning canvassing application that serves the 40 appraisers from the County Assessor’s Office. This new tool is a mobile GIS web-application that provides appraisers with real-time information about properties and the ability to update records on-site, capture site photos, improve productivity, and eliminate the use of paper. The mobile app, first deployed in 2013, has reduced the annual business canvassing effort by 50%, and is now serving as a successful proof-of-concept for future use of mobile technology by the County Assessor’s Office and other County agencies. The collaborative effort between the County’s IT Department, prime consultant Psomas, and Northgate produced the conceptual design, built, and implemented the program in groundbreaking time: less than 5 months. The application was selected as the National Association of the Counties 2014 Achievement Award Winner in the Information Technology category. This is one of several GIS-based solutions that Psomas and Northgate are developing for various County agencies, including projects for the Public Works Agency, Community Development Agency, the Registrar of Voters, and the Office of Homeland Security and Emergency Services.

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Drone Mapping and Imagery for Sediment Management Facility

Northgate delivered high-resolution aerial photogrammetry using small, unmanned aerial systems (UAS, or "drones") for a 2,000-acre dredged sediment management and disposal facility in the San Francisco Bay-Delta region. The flexibility of UAS technology allowed Northgate to collect images of tidal, seasonal, and managed wetland areas at the end of the dry season to establish baseline conditions for future monitoring of the growth of native and invasive vegetation communities. Additionally, the UAS technology and photogrammetric processing methods allowed Northgate to produce highly accurate and detailed digital surface elevation models to support ongoing and long-term construction monitoring and management. The elevation model for this project will be used to make accurate measurements of cell volumes for placement and management of sediments. Further construction applications of these technologies include balancing grading plans, calculating levee stability, monitoring subsidence and settlement, and assessing potential impacts due to sea level rise.

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Visual Impact Assessment Support, AT&T Microwave Radio Upgrade, Yosemite National Park

Northgate's team of GIS and visual resource analysts provided support for environmental permitting and replace...

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Visual Impact Assessment Support, AT&T Microwave Radio Upgrade, Yosemite National Park

Northgate's team of GIS and visual resource analysts provided support for environmental permitting and replacement of existing radio and microwave towers necessary to increase bandwidth of existing Internet and phone service throughout Yosemite National Park, the Hetch Hetchy Water and Power O'Shaughnessy Dam complex, and the communities of El Portal, Foresta, Wawona, and Yosemite West. Tasks included viewshed analysis and modeling to help identify which areas of the Park the proposed towers could be viewed, photo-documentation of field balloon tests simulating locations and height of proposed towers, and development of 3D models and photo-simulations of the proposed towers as viewed from different viewpoints and with different tower specifications. Northgate worked closely with the client and with the National Park Service to achieve regulatory compliance of the delivered work products.

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Expert Witness & Litigation Support
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Emergent Chemical Investigation and Expert Witness Services

Northgate performed an investigation and provided expert testimony regarding the distribution and sources of hexavalent chromium and the emergent chemicals 1,4 dioxane and n nitrosodimethylamine (NDMA) and other inorganic and organic contaminants in soil and groundwater. The project site was a former printed circuit board manufacturing facility for the aerospace industry, and was previously used for automotive manufacturing. Northgate conducted a thorough review of historical data and facility plans, reviewed records of printed circuit manufacturing operations at the Site, and collected soil and groundwater samples. Historical plans of the manufacturing facilities and aerial photographs were used to correlate locations of impacted soil and groundwater with historical features and operations. These investigations confirmed that the historical printed circuit manufacturing operations were the most likely source of the subsurface contamination.

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Environmental Assessment and Remediation,

Santana Row, San Jose, California

Northgate was the lead technical manager for a 50-acre Brownfields redevelopment site in San Jose, California, remediated under a Voluntary Cleanup Agreement and a Prospective Purchaser Agreement negotiated with the California Department of Toxic Substances Control (DTSC). The site, which originally consisted of orchards and other agricultural land, was first developed as a shopping center and automobile dealership during the early 1960s. As part of site redevelopment, the existing center was completely demolished and replaced with a unique, mixed residential/commercial development. During demolition and redevelopment, removal actions were implemented to protect human health and the environment by minimizing exposure to soils containing pesticides, lead, and arsenic. Cleanup goals were developed based on a risk assessment and an evaluation of naturally-occurring background levels of metals. Affected soils were identified, isolated, and encapsulated in proposed commercial development areas, with clean soils relocated to residential development areas of the site. More than 100,000 cubic yards of soil were removed from the site as clean fill. The removal action work required extensive coordination with the project construction manager, site grading and utility contractors, regulatory agencies, and the public. Northgate also provided third-party oversight of the cleanup and closure of the former automobile dealership, including a review of building decontamination and demolition, removal of aboveground storage tanks, removal of underground oil/water separators and associated drain lines, and removal of a previously unknown underground waste oil tank. Northgate also negotiated cost-sharing arrangements for facility cleanup and closure on the owner's behalf. Barbara Cook of the DTSC presented this site as a case study demonstrating success of the agency's Brownfield development program. Northgate continues to provide long term monitoring and compliance services for this project.

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Pre-Existing Contamination Assessment and Allocation of Responsibility

Northgate provided an opinion regarding pre-lease and existing environmental contamination and the allocation of environmental responsibility between our client (the land owner) and their tenant. Northgate's client and the tenant needed to identify pre-existing contamination to determine the extent of contamination released or otherwise generated at the site as a result of the tenant's use and occupancy, and to come to agreement on compliance goals if and when the tenant vacates the property. Northgate's opinion on pre-existing contamination was based on a thorough review of historical fill import records, aerial photographs, site investigation reports, soil and groundwater data, regulatory audits and reports, and other available documents. Compliance goals were established through diligent statistical analysis of background concentrations, evaluation of current and likely future regulatory screening levels, identification of risk pathways and receptors, and understanding of our client's risk management plans and sensitivities.

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Expert Witness and Litigation Support for Cost Recovery Lawsuit

Los Angeles, California

Northgate assisted a former land owner to negotiate a favorable settlement in this cost recovery lawsuit. A l...

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Expert Witness and Litigation Support for Cost Recovery Lawsuit

Los Angeles, California

Northgate assisted a former land owner to negotiate a favorable settlement in this cost recovery lawsuit. A local agency had taken our client's land and the neighboring properties by eminent domain, and planned a large-scale and costly excavation to remediate chemicals in soil, soil gas, and groundwater. Northgate performed a field investigation, data analyses, and review of historical information to substantially limit our client's liability for regional contamination issues. Northgate's analyses demonstrated that most of the contamination was attributed to other sources, including former underground storage tanks, other industrial operations, and naturally occurring oil and gas deposits. Northgate prepared a cost allocation strategy and represented our client in mediation. Our efforts substantially lowered our client's share of cleanup costs and achieved a favorable settlement, thereby avoiding a costly legal battle.

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Storm Water
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Industrial Permit Compliance, SWPPP, and Audit for Port of San Francisco Tenant

On behalf of the Port of San Francisco, Northgate assisted with the preparation of the Annual Report for Storm Water Discharges and performance of the Annual Comprehensive Facility Compliance Evaluation for an industrial operations facility at Pier 50 in San Francisco. The facility consists of an approximately 120,000 square foot warehouse, surrounding parking areas, a bermed fueling area, and access roads. Northgate prepared the SWPPP using available information, synthesizing data and entering the information onto the SMARTS reporting site. Northgate assisted the facility in performing an Annual Evaluation in accordance with the General Permit to Discharge Storm Water Associated with Industrial Activity (IGP). Northgate performed a facility inspection with staff to view all areas of industrial activity, potential pollutant sources, drainage areas and best management practices. Based on these activities, Northgate provided the facility with a short checklist form documenting the Annual Evaluation, and a technical memorandum that described recommendations for modification to the SWPPP, BMPs, and the monitoring program for IGP compliance.

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Site Assessment, NPDES Permitting, and Construction Management for Mixed-Use Development in Maryland

Northgate conducted a Phase I ESA and Phase II Subsurface Investigation in connection with a property acquisit...

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Site Assessment, NPDES Permitting, and Construction Management for Mixed-Use Development in Maryland

Northgate conducted a Phase I ESA and Phase II Subsurface Investigation in connection with a property acquisition. Redevelopment plans for the property included four levels of below-ground parking, which would require the removal of large volumes of VOC-impacted groundwater during foundation excavation. Northgate designed a VOC treatment system to be implemented in the event of an exceedance of established discharge standards pursuant to a newly implemented MS4 jurisdictional permit under the NPDES program. Northgate managed complicated NPDES compliance requirements and provided weekly monitoring reports to Maryland Department of the Environment’s Industrial Waste Permitting Division during the construction dewatering period that took place 24-hours a day, 7-days a week for several months. Northgate’s permitting and management services prevented an construction delays and site disruption due to existing environmental impacts

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PCB Runoff Prevention Plan

Alameda County Clean Water Program

In 2010, the U.S. EPA approved a Total Maximum Daily Load (TMDL) for polychlorinated biphenyls (PCBs) in the San Francisco Bay. As part of the TMDL implementation, the Municipal Regional Storm Water Permit requires local municipalities to take steps to reduce controllable sources of PCBs that can migrate to the Bay. Northgate supported the Alameda County Clean Water Program in a pilot project designed to identify potential PCB sources in construction materials and implement best management practices (BMPs) to reduce PCBs in storm water runoff. At the client's request, Northgate evaluated the draft BMPs for completeness and effectiveness. Northgate developed materials to support the Model Implementation Process and participated in role-playing exercises with the client and with other stakeholders at the municipal and state level.

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City of Torrance Nutrient and Toxics TMDL Monitoring

Northgate performs monthly storm water monitoring for the City of Torrance, as required under the Machado Lake Nutrient and Toxics Total Maximum Daily Load (TMDL) standards and in accordance with the Machado Lake Nutrient and TMDL Special Study Work Plan. Nine locations are sampled under dry weather conditions, and continuous stage or flow depths are recorded and samples collected during qualifying precipitation events. Northgate developed Standard Operating Procedures (SOPs) and protocols for concentrating and extracting sediment from the liquid samples, and for collecting samples from conveyances as deep as 45 feet below ground surface. Flow and analytical data are evaluated to determine compliance with numerical waste discharge requirements in the discharge water. Northgate also prepares hydraulic calculations of open channel and pipe flow in storm water conduits and summarizes storm event throughput and nutrient TMDLs to be included in the Lake Machado special study progress report, a City submittal to the Regional Water Quality Control Board of Los Angeles.

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Geotechnical Engineering
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Geotechnical Investigation of Animal Care and Control Facility

Northgate performed an investigation of geotechnical engineering issues associated with the renovation of a historic brick structure located in San Francisco. Renovation of the building includes reinforcing the existing brick bearing walls and steel support columns and installing new supplemental concrete footings at the perimeter of the building, along new bearing wall locations, and at interior column locations. The underlying soil materials consist of localized areas of fill and serpentine bedrock. Northgate’s investigation included the excavation of test pits to assess the depth and size of the existing footings, the bearing material, and the presence or absence of groundwater at the footing depths. These observations were used by the design team to fill data gaps regarding existing conditions. Northgate concluded that the site is suitable for the proposed renovation activities provided that any new footings extend at least as deep as the existing footings.

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Moller Ranch Erosion Assessment

Northgate was retained by the developer to assess the erosion potential at this property by evaluating the dispersive nature of the site clays and claystone bedrock. Northgate sampled the soil and bedrock at selected locations, including alkali soil areas, colluvium/landslide deposits, seep areas, and deep bedrock cuts. Samples were analyzed for dispersive characteristics of clay coil by Double Hydrometer (ASTM D4221) and the Pinhole Test (ASTM D4647 Method B). Each sample was also analyzed for soil chemistry parameters, including exchangeable sodium percentage. Northgate analyzed the laboratory results and presented our conclusions regarding the erosion potential for the site.

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Passive Remediation System, Shinsei Gardens Housing Development, Fleet Industrial Supply Center

Alameda, California

Northgate prepared a Removal Action Workplan and developed and evaluated cleanup alternatives for volatile org...

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Passive Remediation System, Shinsei Gardens Housing Development, Fleet Industrial Supply Center

Alameda, California

Northgate prepared a Removal Action Workplan and developed and evaluated cleanup alternatives for volatile organic compounds and petroleum-related chemicals in soil, soil gas, and groundwater at the former Fleet Industrial Supply Center in Alameda, California. The California Department of Toxic Substances Control required the use of engineering controls to mitigate vapor intrusion risk to indoor air of a planned affordable housing project at the site. Northgate recommended a passive sub-slab depressurization system as an effective, sustainable, and cost-effective technology. Northgate designed the system to recirculate fresh air beneath the residential buildings and reduce the potential for drawing impacted soil gas into the depressurization system. The system included a vapor barrier, clean air intakes, and wind turbines to draw air through the system. Northgate provided oversight for system installation and testing, conducted initial monitoring to verify its effectiveness, and prepared the operations and maintenance plan. Northgate continues to provide annual inspections and maintenance of the system.

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Geotechnical Design Plans and Specifications for Tidal Marsh Restoration

Northgate assisted Sonoma Land Trust with the preparation of design plans and technical specifications for the Lower Spring Branch Creek Restoration Project, just south of the Rush Ranch Nature Center in Suisun, California. Northgate performed a geotechnical investigation of the soil conditions at the location of a proposed culvert replacement bridge. The very soft, compressible, and liquefiable soils presented a significant design challenge for the proposed bridge. Northgate developed alternative soil improvement strategies and assisted Sonoma Land Trust in bidding the improvement work. Northgate produced a set of construction documents consisting of engineering plans and technical specifications describing the methods, means, and performance criteria to construct the project. The prepared construction documents were used to implement the restoration design, and to support the project permitting process with resource agencies. Northgate also provided AutoCAD services and a licensed civil engineer to review and certify the design documents. When complete, the restored area will consist of 14 acres of restored tidal marsh, with a tidal channel constructed to enhance hydraulic communication with Grizzly Bay.

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Rosamond Solar Farm

Antelope Valley, California

Northgate conducted a geotechnical investigation of a property for suitability as a solar farm. Northgate investigated the site to assess pertinent subsurface data, and submitted geotechnical samples to measure subsurface soil characteristics. Northgate performed an engineering analysis to determine appropriate geotechnical engineering design criteria, and prepared a report summarizing the results and presenting recommendations for design.

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Sustainable/Climate Change
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Superfund Site Remediation Program Oversight and Optimization

Northgate provided program oversight of the groundwater remediation and restoration program at a large, multi-party Superfund site in the Santa Clara Valley. The remediation program entails containment and treatment of a one-mile long solvent-contaminated groundwater plume migrating beneath commercial and residential properties. Northgate developed strategies to optimize the 25-year old pump-and-treat program, characterized and evaluated the feasibility of sustainable remediation alternatives, implemented innovative technologies to move the project toward closure, and performed a sustainability assessment to streamline the operations, maintenance, and monitoring program to save energy, water, and costs. Northgate also provided strategic analysis to focus data collection and analysis, identify potential future liabilities, and develop risk-based mitigation measures appropriate for current and future development.

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Commercial Energy Audits and Benchmarking Services in San Francisco

Northgate conducted building energy audits and benchmarking services on several commercial properties to comply with the San Francisco Existing Commercial Buildings Energy Performance Ordinance of 2011 (the Ordinance). Northgate surveyed the building systems and operations to establish baselines and peer-to-peer benchmarks, evaluated major function energy use, disclosed building performance, and identified steps to reduce consumption. Our analyses and audits offered low/no cost solutions that resulted in immediate operating cost reductions. After preparing the required Annual Energy Benchmarking Report using ENERGY STAR Portfolio Manager, Northgate submitted the completed report to SF Environment and oversaw the facilities’ compliance with the Ordinance on an ongoing basis. Other sustainable solutions offered by Northgate include Retro Commissioning & Continuous Commissioning ; energy studies and Building Energy Simulation; LEED® analysis; facility-wide assessments focused on energy, water, and waste efficiency; expertise in locating available public incentives and other funding sources for building efficiency upgrades; and formulation of client-specific energy policies and strategy.

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Shoreline Improvements at India Basin, San Francisco

The India Basin Redevelopment Project encompasses 39 acres over four properties: India Basin Shoreline Park, India Basin Open Space, and 700 and 900 Innes Avenue. In support of San Francisco’s Blue Greenway Parks Alliance initiative, two properties will be redeveloped as a public park designed to retain cultural features of the historical landscape and the original Bay shoreline as part of an interconnected system of trails and parks along the waterfront. Another area will be used for public recreational access to the shoreline and for habitat restoration. On behalf of the San Francisco Recreation and Parks Department and Build Development, Inc., Northgate’s environmental analyses are being used to help select the final designs, determine if environmental quality is suitable for beneficial reuse in seasonal wetlands and tidal marsh habitat, design remediation and mitigation programs to clean up historical contamination along the shoreline, restore the properties to conditions supportive of future uses, provide supporting documents for the Project EIR, and support resource agency permit applications for project improvements.

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Drinking Water and Waste Water Technical Assistance for Disadvantaged Communities

Northgate is part of an interdisciplinary team of industry experts and Sacramento State University students, f...

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Drinking Water and Waste Water Technical Assistance for Disadvantaged Communities

Northgate is part of an interdisciplinary team of industry experts and Sacramento State University students, faculty, and staff to support small, low-income communities that request State Water Resources Control Board funding to improve their water and waste water systems. The project, led by the Institute of Water Energy Sustainability and Technology (iWEST) at California State University Sacramento, is improving infrastructure and governance throughout California communities such as Oroville, Locke, Crescent City, and Anza. Northgate provides planning, environmental permitting, groundwater investigations, and other needs that arise as projects are identified. For example, Northgate is providing support to Locke Water Works where the current water supply well has concentrations of arsenic that exceed the maximum contaminant level of 10 parts per billion. The Sacramento County Water Agency operates a water system that serves neighboring Walnut Grove. A project is currently being designed that will intertie the two water systems by constructing a 4-inch, 3,500-feet transmission main. Northgate’s role is to complete the necessary environmental documentation including preparation of the biological assessment and initial study for this intertie project.

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Air Quality
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ESA, IAQ study, and Litigation Support for Retail Row Buildings in District of Columbia

Northgate performed Phase I ESAs on a series of adjoining retail and restaurant buildings in northwest Washing...

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ESA, IAQ study, and Litigation Support for Retail Row Buildings in District of Columbia

Northgate performed Phase I ESAs on a series of adjoining retail and restaurant buildings in northwest Washington, DC in connection with property acquisition and planned redevelopment. On behalf of an owner/developer client, Northgate completed comprehensive due-diligence on six buildings in a very busy Washington neighborhood. Based on the Phase I ESA reports, Northgate performed several subsurface investigations and indoor air quality studies that identified the presence of dry cleaning solvent in groundwater and indoor air. Subsequent to the investigations, the portion of the property where the former dry cleaner was located was accepted into the Voluntary Cleanup Program (VCP) in anticipation of future development. Follow-up investigations included a comprehensive soil vapor study beneath the former dry cleaner property, which remained occupied as a restaurant. Northgate staff worked closely with the client and the client’s attorney to support landlord-tenant litigation matters related to the environmental conditions of the property. Northgate’s litigation support efforts included responding to a deposition notice and drafting technical findings. Portions of the site have been successfully redeveloped as residential apartments with a below ground parking garage.

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Air Quality Monitoring for Oakland Army Base Redevelopment

Northgate developed an Air Quality Monitoring Program to track ambient air in the largely residential West Oakland neighborhood that is directly downwind of the former Oakland Army Base and the 140-acre construction phase that began in November 2013. The West Oakland community is exposed to diesel particulate matter at levels nearly three times the average level, and is understandably sensitive to the potential air quality impacts of large-scale redevelopment activities. The monitoring program includes three PM2.5 monitors, an automated sample collection system for elemental carbon, and a meteorological station. Hourly data are automatically transferred to an offsite database, and are then pushed to a web portal to provide real-time data, analysis, visualizations, and reports in easy-to-understand interactive maps, charts, graphs, and archives accessible to the public, project stakeholders, and regulatory agencies. Air quality data are evaluated relative to daily and annual EPA thresholds. The timely and direct public access to air quality information provides a solid basis for transparent and productive stakeholder discussions as redevelopment progresses.

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Compliance
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Compliance Support for Real Estate Portfolio, Washington, DC

On behalf of a large real estate investment trust, Northgate collaborates with a multi-stakeholder group of buyers and sellers, internal due diligence specialists, and legal counsel, as well as state regulators overseeing Brownfields Voluntary Cleanup Programs. Northgate manages the remedial activities at contaminated properties, overseeing UST removals, evaluating the completeness and performance of remedial contractors, reviewing remediation reports and regulatory permits, evaluating building designs relative to environmental issues, and attending construction planning and progress meetings. Additionally, we provide emergency response and crisis management for environmental issues (e.g. abandoned USTs, releases and spills, and discovery of asbestos containing materials). Northgate has worked on 15 sites enrolled in the Voluntary Cleanup Programs in Maryland, the District of Columbia, and Virginia. Our staff have developed trusted relationships with regulators, including the head of the Maryland Department of Environment Voluntary Cleanup Program, and are known for the thoroughness and responsiveness of our compliance submittals.

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Compliance Support and Construction Management at Los Angeles Airport

Northgate performed oversight and management of contaminated soil import and removal at the LAX Tom Bradley International Terminal (TBIT). The team developed and ensured compliance with a site-specific soil management plan and health and safety plan during renovation and demolition at TBIT. Northgate performed 1166 Air Quality Management District (AQMD) permit-required soil monitoring during demolition of concrete tarmac adjacent to jet fuel supply lines. Widespread jet fuel contamination was discovered during the initial phase of demolition. Northgate collected soil samples at the request of Los Angeles World Airports, developed additional site-specific compliance plans, and provided oversight and monitoring during demolition and during the removal of jet fuel supply features. Additionally, Northgate reviewed and modified the project storm water protection plan and provided monitoring and sampling services during storm events to ensure compliance.

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Environmental Restoration Support Services, Bayview Site Development, Lawrence Berkeley National Laboratory

Northgate provides as-needed environmental consulting and compliance services related to future development in...

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Environmental Restoration Support Services, Bayview Site Development, Lawrence Berkeley National Laboratory

Northgate provides as-needed environmental consulting and compliance services related to future development in the vicinity of Lawrence Berkeley National Laboratory’s former Bevatron particle accelerator. Northgate routinely provides environmental sampling and profiling services to ensure compliance with internal protocols, soils management plans, waste management plans, and waste transportation and disposal regulations, and adherence to LBNL, US Department of Energy, California EPA, and other applicable quality, safety, regulatory, and procedural guidance. Additional technical tasks have included performing historical site assessments for chemical and radiological impacts associated with former facility activities.

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Compliance Support for PG&E Prime Contractors

Since 2014, Northgate has supported permitting, licensing, and compliance programs throughout PG&E territory as a subcontractor to PG&E prime MSA holders. Northgate has provided up to five staff, including one planner, two to four environmental inspectors, and one air and hazardous waste permitting specialist. Northgate has prepared the following sections for Proponent’s Environmental Assessment (PEA) for multiple transmission lines: Geology, Soils and Seismic Potential; Minerals; Hazards and Hazardous Materials; and Hydrology and Water Quality. Northgate also routinely provides GIS and CAD support, field reports, and Environmental Release to Construction (ERTC) documents.

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