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Stephen Sherman, P.G.

Stephen Sherman, P.G.
Consultant

Stephen Sherman, P.G.

Consultant

Mr. Stephen Sherman is a licensed professional geologist with 15 years of experience in soil, air, and groundwater investigation; soil and groundwater remediation; and Phase I environmental site assessments (ESAs). His experience includes managing and leading air, soil, and groundwater site investigations; managing monitoring and sampling programs; implementing various drilling and push technologies and in situ remedial injections for chlorinated solvents; and designing and overseeing the installation of groundwater monitoring, injection, and extraction wells. Mr. Sherman also has experience in construction management for remediation projects and remedial performance evaluations.

Using Three-Dimensional Modeling to Optimize Investigation and Remedial Injection Programs at CVOC-Contaminated Sites

Poster

June 04 2024

Vapor Intrusion

Groundwater and Sub-Slab Vapor Investigations at a Former Industrial Plating Facility, San Carlos, California Managed and led vapor intrusion and groundwater investigations at a former industrial plating facility with dissolved-phase chlorinated solvent and metals impacts to groundwater. Acted as main resource for stakeholders in navigating local regulatory requirements during commercial redevelopment of the property. Planned and implemented indoor and sub-slab air sampling events; cone penetrometer (CPT), membrane interface probe, and hydraulic profiling tool (MiHPT) advancement; and temporary and permanent monitoring well installation and sampling.
Investigation and Remediation at a Chlorinated Solvent Cleanup Site, South San Francisco, California Managed and led the field effort for the predesign investigation and in situ remediation at a former industrial dry cleaning site containing a dissolved-phase chlorinated solvent plume underlying multiple properties. The predesign investigation results filled vapor intrusion and hydrogeologic data gaps in the existing conceptual site model sufficient for design of an enhanced reductive dechlorination injection remedy. Oversaw site field activities including soil vapor sampling; CPT and MiHPT advancement; temporary and permanent monitoring well installation and sampling; passive flux meter deployment; and remedial injection program implementation.
Soil and Soil Vapor Investigations at Former Fillmore and North Beach Manufactured Gas Plants, San Francisco, California Acted as the field team lead and project geologist for soil and soil vapor intrusion investigations at residential properties in San Francisco’s Marina District. The properties were in the footprint of historical manufactured gas plant operations, and primary chemicals of concern were volatile organic compounds, PAHs, and metals. The investigations typically involved installing soil vapor wells beneath, or adjacent to, the concrete slab foundations for the evaluation of air quality and assessment of potential exposure pathways.
Soil Vapor Investigation at Former Orchard, Mountain View, California Led the soil and air sampling effort for a residential development site potentially impacted by pesticides. Oversaw the advancement of shallow soil borings and installed and sampled soil vapor wells.

Site Investigation

Groundwater and Sub-Slab Vapor Investigations at a Former Industrial Plating Facility, San Carlos, California Managed and led vapor intrusion and groundwater investigations at a former industrial plating facility with dissolved-phase chlorinated solvent and metals impacts to groundwater. Acted as main resource for stakeholders in navigating local regulatory requirements during commercial redevelopment of the property. Planned and implemented indoor and sub-slab air sampling events; cone penetrometer (CPT), membrane interface probe, and hydraulic profiling tool (MiHPT) advancement; and temporary and permanent monitoring well installation and sampling.
Soil, Groundwater, and Soil Gas Investigation at Former Gas Station and Paint Factory, Brunswick, Georgia Led the field investigation for a Phase II ESA that included more than 100 surface and subsurface soil samples, roto-sonic soil borings, grab groundwater samples, and 70 passive soil gas samplers. The primary chemicals of concern for the site were benzene, PAHs, PCBs, and metals.
Soil, Groundwater, and Light, Nonaqueous-Phase Liquid Investigations and Remediation for Multiple Release Sites at Golden Eagle Refinery, Martinez, California Acted as the field lead and project geologist for soil and groundwater investigations at refinery pipeline release sites. Managed groundwater monitoring and sampling programs, performed remediation system tracking, and reported on performance. Evaluated the effectiveness of remedial systems, made recommendations for augmentation or decommissioning based on assessment of light, nonaqueous-phase liquid (LNAPL) mobility using decline curve analysis, and calculated LNAPL transmissivity values from pump data and testing.
Soil and Groundwater Investigation at Former Allied Engineering Facility, Alameda, California Oversaw the installation and sampling of groundwater monitoring wells and hydropunch locations to further delineate the vertical and horizontal extent of chlorinated solvent dissolved-phase plumes at a former metal working facility.
Phase I and Phase II Environmental Site Assessments at Multiple Car Rental Locations in California, Illinois, New York, and Indiana Performed multiple Phase I ESAs following ASTM International (ASTM) Standard E1527-13 and performed follow-up Phase II soil, soil vapor, and groundwater investigations to further assess identified recognized environmental conditions (RECs) at active and inactive car rental and maintenance facilities in California, Illinois, New York, and Indiana.
Soil Investigation at Former Aggregate Processing Facility, Pleasanton, California Led the direct-push soil sampling effort involving more than 50 soil borings as part of a Phase II ESA in the footprint of processing buildings and machinery at a former aggregate facility.
Soil Investigation and Remediation at Former Veneer Plant Maintenance Facility, Weed, California Performed site investigation and excavation oversight activities in the footprint of a demolished maintenance facility. The investigation activities included identification of historical features and soil sampling, digging test pits, and field screening using x-ray fluorescence and hydrocarbon testing tools. Remediation involved the removal of more than 2,100 yd3 of primarily metals-contaminated soil and the collection of confirmation soil samples.
Dense, Nonaqueous-Phase Liquid Subsurface Delineation at Potrero Power Plant, San Francisco, California Performed extensive subsurface delineation of dense, nonaqueous-phase liquid (DNAPL) at a diesel and natural gas power plant built over a historical manufactured gas plant site. Oversaw the advancement of more than 60 soil borings using roto-sonic drilling through sandy artificial fill and landfill debris overlaying lean Bay Mud clay. Soil samples were collected for chemical and geotechnical properties, including composited soils in the DNAPL saturation zone for reagent batch testing as part of a predesign soil stabilization study.
Soil Investigations at San Francisco Refinery, Rodeo, California Performed an impacted soil and waste delineation study using direct-push sampling in a multi-acre, artificially filled valley overlying sandstone bedrock. Used an x-ray fluorescence tool to identify heavy metals in the soil along with traditional environmental field screening methods and observations to map waste layers and create comprehensive cross sections of the valley.
Mud Logging for Natural Gas Production Wells at Multiple Central Valley Drilling Locations, California Created boring log reports using sample cuttings, gas monitoring, and depth projection techniques during mud rotary drilling for exploratory gas production wells drilled to depths ranging from 3,000 to 6,000 ft at various locations within California’s Central Valley.

Remedial Design

Investigation and Remediation at a Chlorinated Solvent Cleanup Site, South San Francisco, California Managed and led the field effort for the predesign investigation and in situ remediation at a former industrial dry cleaning site containing a dissolved-phase chlorinated solvent plume underlying multiple properties. The predesign investigation results filled vapor intrusion and hydrogeologic data gaps in the existing conceptual site model sufficient for design of an enhanced reductive dechlorination injection remedy. Oversaw site field activities including soil vapor sampling; CPT and MiHPT advancement; temporary and permanent monitoring well installation and sampling; passive flux meter deployment; and remedial injection program implementation.
Dense, Nonaqueous-Phase Liquid Subsurface Delineation at Potrero Power Plant, San Francisco, California Performed extensive subsurface delineation of dense, nonaqueous-phase liquid (DNAPL) at a diesel and natural gas power plant built over a historical manufactured gas plant site. Oversaw the advancement of more than 60 soil borings using roto-sonic drilling through sandy artificial fill and landfill debris overlaying lean Bay Mud clay. Soil samples were collected for chemical and geotechnical properties, including composited soils in the DNAPL saturation zone for reagent batch testing as part of a predesign soil stabilization study.

Groundwater Modeling

Aquifer Testing at Chlorinated Solvent Cleanup Site, Macon, Missouri Performed aquifer testing on groundwater wells using submersible pumps to acquire site-specific hydraulic conductivity and transmissivity for groundwater transport modeling.

Groundwater Remediation

Investigation and Remediation at a Chlorinated Solvent Cleanup Site, South San Francisco, California Managed and led the field effort for the predesign investigation and in situ remediation at a former industrial dry cleaning site containing a dissolved-phase chlorinated solvent plume underlying multiple properties. The predesign investigation results filled vapor intrusion and hydrogeologic data gaps in the existing conceptual site model sufficient for design of an enhanced reductive dechlorination injection remedy. Oversaw site field activities including soil vapor sampling; CPT and MiHPT advancement; temporary and permanent monitoring well installation and sampling; passive flux meter deployment; and remedial injection program implementation.
Soil, Groundwater, and Light, Nonaqueous-Phase Liquid Investigations and Remediation for Multiple Release Sites at Golden Eagle Refinery, Martinez, California Acted as the field lead and project geologist for soil and groundwater investigations at refinery pipeline release sites. Managed groundwater monitoring and sampling programs, performed remediation system tracking, and reported on performance. Evaluated the effectiveness of remedial systems, made recommendations for augmentation or decommissioning based on assessment of light, nonaqueous-phase liquid (LNAPL) mobility using decline curve analysis, and calculated LNAPL transmissivity values from pump data and testing.
Injection of Calcium Polysulfide at Former Wood Treatment Facility, Windsor, California Performed groundwater sampling and oversaw the injection of calcium polysulfide to address hexavalent chromium contamination in the footprint of a former wood treatment facility.

Site Assessment

Phase I and Phase II Environmental Site Assessments at Multiple Car Rental Locations in California, Illinois, New York, and Indiana Performed multiple Phase I ESAs following ASTM International (ASTM) Standard E1527-13 and performed follow-up Phase II soil, soil vapor, and groundwater investigations to further assess identified recognized environmental conditions (RECs) at active and inactive car rental and maintenance facilities in California, Illinois, New York, and Indiana.
Phase I and Phase II ESAs at Rural Ranch-Style Property in Sonoma, California Performed Phase I ESAs following ASTM Standard E1527-13 supplemented by E2247-08 for two adjacent rural properties with a combined area of 360 acres. Oversaw a follow-up Phase II ESA to further assess RECs identified during Phase I, which included digging test pits to delineate the lateral and vertical extent of a historical burn pit.

Soil Remediation

Soil Investigation and Remediation at Former Veneer Plant Maintenance Facility, Weed, California Performed site investigation and excavation oversight activities in the footprint of a demolished maintenance facility. The investigation activities included identification of historical features and soil sampling, digging test pits, and field screening using x-ray fluorescence and hydrocarbon testing tools. Remediation involved the removal of more than 2,100 yd3 of primarily metals-contaminated soil and the collection of confirmation soil samples.
Construction Management for Soil Remediation at Former Metal Salvage Facility, North Kona, Hawaii Assisted with construction management for a 7-acre soil remediation project involving removal of more than 22,000 yd3 of lead-impacted soil.
Construction Management for In Situ Soil Stabilization at Golden Eagle Refinery, Martinez, California Assisted in construction management for a soil stabilization and capping project at a 6 acre historical waste management unit acid-sludge landfill. The yearlong project involved clearing the waste management unit of obstacles using excavators and then injecting and mixing cement grout into the soil using a 10-ft-diameter hollow auger. The auger was advanced in overlapping columns to approximately 15 ft and into the underlying bay mud. Duties involved assisting project designers to communicate with the environmental contractor and track their daily progress in the field.

Water Management

Construction Oversight for Water Supply Production Well, Eureka, California Conducted oversight for construction of a new 475-ft-deep water supply production well and demolition of retired production wells.

Stormwater Management

Stormwater Pollution Prevention Plan Inspection and Implementation at Santa Susana Field Laboratory, Simi Valley, California Performed field inspections for best management practices and made recommendations based on existing requirements in the stormwater pollution prevention plan developed for the 2,668-acre former rocket and nuclear reactor testing facility. Performed surface water runoff sampling, rain gauge maintenance and data collection, and surveying and mapping tasks.
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