Environmental, Resource, and

Sustainability Consulting and Contracting

Since 1990

Clearwater Group 1990-2017 Copyright

​​​​​Clearwater Group


East Bay Office: (Main Office)
229 Tewksbury Avenue
Point Richmond, CA 94801 USA


North Bay Office:

777 Grand Avenue; Suite 205

San Rafael, CA 94901 USA

CONTACTS:

Main Number: +1.510-307-9943

Fax: 510-232-2823


Olivia P. Jacobs

Mobile:     +1.510-590-1099
Email:
oj@clearwatergroup.com

James A. Jacobs

Mobile: +1.510-590-1098 
Email:
jjacobs@clearwatergroup.com 


Subsurface Investigations

Clearwater Group (Lic. 799370) and in-house FAST-TEK Engineering Support Services (Lic. 624461) have worked on thousands of properties, performing subsurface investigation and drilling services since 1990. Soil or groundwater samples are collected using Clearwater Group's Geoprobe® 5400 Direct Penetration Technology (DPT) rig. The rig can also be used to perform active high-resolution soil gas surveys or accurate soil conductivity logging for rapid lithologic assessment. Clearwater Group also performs drilling and sampling in specialized environments: lagoons, bays, tundra, and wetlands. Clearwater uses passive soil vapors surveys as a screening tool to identify the presence and approximate concentration of volatile and semivolatile organic compounds found in the subsurface.  Low flow groundwater sampling methods lower waste disposal costs.  


​SUBSURFACE INVESTIGATIONS - 1

PROJECT: Phase II Subsurface Investigation - Clearwater Group performed a Phase II Subsurface Investigation to determine the location of the source of PCE, TCE, motor oil, and diesel detected in one of three monitor wells on-site. A regulatory approved workplan and health and safety plan were developed. Twenty 1.5 inch diameter borings were drilled by Clearwater Group using continuous core drilling to a maximum depth of 11 feet below ground surface. This method of drilling allowed for a detailed characterization of the subsurface conditions. 

Location: Rohnert Park, California
Client: Artesian Environmental

RESULTS: The Clearwater Group drilling method saved the client an estimated $8,640 in disposal fees.

PROJECT: Phase II Environmental Subsurface Investigation - As part of a corporate divestment, a Phase II Environmental Assessment was performed by Clearwater Group at an office building in Mountain View, California. Subsurface drilling using the continuous coring tool was performed. Clearwater Group drilled four boreholes to a maximum depth of 19 feet below ground surface. Soil and groundwater samples were collected and analyzed for solvents and gasoline. Cost control was performed by computer accounting and a weekly job summary.

Location: Mountain View, California
Client: Consultant

RESULTS: Clearwater Group saved the client approximately $7,655 over the cost of conventional well installations and soil disposal.

PROJECT: Subsurface Investigation in Gas Field - Clearwater Group represented the land owner to perform a visual survey and subsurface investigation of shallow soil conditions in a gas field. Fifteen well sites and two tank farms were inspected. Twenty soil borings were drilled by Clearwater Group to evaluate subsurface conditions. Water samples were collected in two well cellars. Contaminants included crude oil, motor oil and lubricants. The visual survey and laboratory analyses were used to develop a soil remediation plan and a more effective operations and maintenance program. 

Location: Sacramento Area, California
Client: Gas Property Owner 

RESULTS: Clearwater Group's written report was used for settlement purposes in favor of the client, saving the client hundreds of thousands of dollars.

PROJECT: Subsurface Characterization and Well Installation - Clearwater Group was retained by a client to oversee the drilling of ten soil borings, converting seven borings into groundwater monitoring wells. Clearwater Group delineated the vertical and lateral extent of gasoline, diesel, and metals contamination on the subject property, a former bulk storage facility. Cross sections, well logs and iso-concentration maps were used to define the contamination on the site. Significant regulatory and client contact was performed on this site. 

Location: San Diego
Client: Consulting Firm 

RESULTS: The placement of the wells allowed for accurate assessment of the vertical and lateral extent of hydrocarbon contamination in the subsurface, saving the client tens of thousands of dollars in additional subsurface investigations.

 
SUBSURFACE INVESTIGATIONS - 2
 

PROJECT: Groundwater Monitor Well Installation - Clearwater Group performed a Phase II Subsurface Investigation by drilling seven soil borings on-site. Three of the wells were subsequently converted into groundwater monitoring wells for the detection of free phase liquid hydrocarbons and dissolved constituents in groundwater.

Location: Stockton, California
Client: Consultant

RESULTS: The placement of the wells allowed for accurate assessment of the subsurface conditions, saving the client tens of thousands of dollars in additional subsurface investigations.

PROJECT: Subsurface Investigation and Monitor Well Installation - Clearwater Group was retained by a bank to perform a subsurface investigation using direct penetration technology (DPT) drilling using Clearwater Group's Geoprobe equipment. Clearwater Group drilled three soil borings as the initial phase of the subsurface investigation. Based on the direct penetration technology boring results. Clearwater Group installed three groundwater monitoring wells that were placed in appropriate locations: two were downgradient and one was placed in the upgradient location. All three wells were placed in zero-contamination areas. The wells were developed, surveyed and sampled. The site was closed.

Location: Berkeley, California
Client: Artesian Environmental

RESULTS: After one year of quarterly monitoring, site closure was obtained.

PROJECT: Subsurface Investigation for Lease Transfer - As part of negotiation for a new lease, a consultant retained Clearwater Group to perform a subsurface investigation. The previous tenant had operated a vehicle and equipment rental and repair business on the property. After completing a Phase I Environmental Assessment, Clearwater Group performed a subsurface investigation to document subsurface conditions. Clearwater Group collected four groundwater samples and twelve soil samples using direct penetration technology (DPT) drilling. Based on the chemical analyses, it appeared that an offsite source of gasoline had impacted the groundwater beneath the property. Minor concentrations of oil and grease were detected in the soils. The results helped to establish pre-lease conditions for the owner and new tenant, minimizing potential conflict in the future. The responsible party was notified as to the extent of the gasoline contamination.

Location: Santa Rosa, California
Client: Equipment Company 

RESULTS: The subsurface investigation was completed and the lease transfer was accomplished.

 
DRILLING / SOIL VAPOR PROJECTS - 1
 

Project: Subsurface Investigation at Resins Plant - Clearwater Group was hired to perform angle drilling and limited access drilling services for a consultant in a resins plant in northern California. Clearwater Group's 40 hour-OSHA safety trained, two person crew drilled in level C protection into soils containing phenols. Clearwater Group drilled several borings and cored concrete. Soil samples were collected in 4 foot long, 1.25 inch diameter stainless steel samplers with inner sleeves. All holes were grouted with neat cement. No cuttings were generated. 

Location: Northern California
Client: Consultant

RESULTS: Soil cuttings were not generated and the client saved $1,900 in soil disposal fees.

Project: Soil Vapor Survey at Airport - Clearwater Group was hired to perform a soil vapor survey along 1,000 foot pipeline containing aviation fuel at the San Francisco International Airport. The survey included twenty-five points. Data from the vapor survey was reported to the client using iso-concentration maps. A detailed report with the field procedures was prepared for the client. All vapor holes were grouted with neat cement. No cuttings were generated.

Location: San Francisco, California
Client: Consultant 

RESULTS: The soil vapor survey was completed in the field in half the time and under budget.

PROJECT: Soil Sampling in Lagoon - Clearwater Group designed a limited access, continuous core drilling program in an abandoned landfill. The landfill was located in an environmentally sensitive area located in the Golden Gate National Recreation Area. Clearwater Group drilled 77 soil borings in an inaccessible area in the lagoon to delineate the vertical and lateral extent of metals and hydrocarbon contaminated soils. Several soil borings were drilled below low tide. Clearwater Group interacted with the Coastal Commission and the San Francisco Bay Office of the RWQCB.

Location: Bolinas Lagoon, California
Client: Stimpel-Wiebelhaus Associates

RESULTS: Clearwater Group obtained high quality soil samples for the client

PROJECT: Limited Access Soil Sampling at Gasoline Station - Clearwater Group performed soil sampling near gasoline pumps at a gasoline service station. In one day, four soil borings were drilled by Clearwater Group under a canopy using a 1.5 inch diameter stainless steel continuous coring sampler to evaluate subsurface conditions. The soil samples were collected in transparent, non-reactive, hard-shell transparent plastic soil liners. The borings were drilled to a maximum of 19 feet below ground surface. Grab groundwater samples were also collected. Clearwater Group negotiated the project with the San Joaquin County Environmental Health Department.

Location: Manteca, California
Client: Confidential 

RESULTS: Continuous core drilling provided superior geologic data which would not have been available using standard drilling techniques. Since soil cuttings were not generated, the client saved an estimated $2,000 in soil disposal fees.

 
DRILLING / SOIL VAPOR PROJECTS - 2
 

PROJECT: Subsurface Investigation and Drilling - Clearwater Group conducted a Phase II Subsurface Investigation to determine the location of the source of solvents detected in one of three monitor wells on-site. A regulatory approved workplan and health and safety plan were developed. Twenty 1.5 inch diameter borings were drilled by Clearwater Group using continuous core drilling to a maximum depth of 11 feet below ground surface. Clearwater Group negotiated with the North Coast Regional Office of the RWQCB.

Location: Rohnert Park, California
Client: Fortune 500 Firm 

RESULTS: Continuous core drilling allowed for a detailed characterization of the soil conditions.

PROJECT: Sampling: 400 Soil Samples - Clearwater Group designed a soil drilling and sampling program on a 5,000 cubic foot soil pile at a Caltrans yard. Clearwater Group drilled 100 soil borings to a maximum of 21 feet below ground surface. Clearwater Group drilled more than 1,800 feet, obtaining 400 discrete soil samples in five days.

Location: Vallejo, California
Client: Consulting Company 

RESULTS: Clearwater Group obtained soil samples for the client under difficult drilling conditions.

PROJECT: Continuous Soil Sampling in Wetlands - Clearwater Group designed a limited access, continuous core drilling program in a wetlands. Clearwater Group continuously cored 5 soil borings to a maximum of 18 feet below ground surface. Clearwater Group drilled through peat and Bay Mud to evaluate the presence of metal contaminated soils.

Location: Point Pinole, California
Client: Consulting Company 

RESULTS: Clearwater Group obtained soil samples for the client under difficult drilling conditions.

PROJECT: Limited Access Well Installation - Clearwater Group was retained to install two 2-inch diameter monitoring wells beneath a ten foot building overhang at a car stereo installation store. The borings were drilled with a Mobile Minuteman Drill Rig to a maximum of 23 feet below ground surface. After drilling was completed, the borings were converted into 2-inch diameter monitoring wells. Site closure was granted by San Mateo County Environmental Health Department in 1995.

Location: Burlingame, California
Client: Investor 

RESULTS: The drilling was completed on time and on budget and site closure was granted.

PROJECT: Soil Vapor Survey - Clearwater Group was retained to perform a soil vapor survey at a Hamilton Air Force Base, which was slated for closure. Approximately 40 holes were drilled to about 10 feet below ground surface. Clearwater Group drilled through up to 16 inches of concrete through airport runways. Soil vapor samples were collected using SUMMA canisters.

Location: Novato, California
Client: URS/Woodward-Clyde Consultants

RESULTS: The job was completed on time in a professional manner.

 
QUARTERLY MONITORING WELL SAMPLING PROJECTS
 

PROJECT: Water Sampling of 23 Monitor Wells at National Laboratory - Clearwater Group was retained to purge and sample 23 monitoring wells at a National Laboratory. Monitor well depths ranged from 50 to 150 feet below ground surface. Previous sampling protocol was not to current RWQCB standards. Clearwater Group implemented EPA - RWQCB approved sampling protocol and submitted documentation of field procedures as well as laboratory data.

Location: Livermore, California
Client: Laboratory 

RESULTS: The project was performed on-time and on-budget. Clearwater Group recommended various changes in the sampling equipment in place to improve sampling quality.

PROJECT: Water Sampling of 7 Monitor Wells - At a site of a former gasoline underground storage tank and bulk facility, Clearwater Groupwas retained to install, develop, purge and sample seven groundwater monitoring wells. Monitor well depths averaged 35 feet below ground surface. Documentation of well sampling was included in the written report.

Location: San Diego, California
Client: Petroleum Company 

RESULTS: Groundwater sampling results have led the client to bring in additional upgradient potentially responsible parties for financial liabilities.

PROJECT: Water Sampling of 10 Monitor Wells - Clearwater Group was retained to perform monitor well purging and sampling of ten monitoring wells at a fleet maintenance facility in the San Francisco Bay Area. Monitor well depths averaged 25 feet below ground surface. Documentation of monitoring well sampling data was included in the certified report. The contaminants included diesel and gasoline.

Location: Burlingame, California
Client: Rental Car Company 

RESULTS: Reduced monitoring requirements were negotiated with the regulator, lowering costs. High quality sampling and reporting allowed the client to assess clean-up options.

PROJECT: Site Closure and Sampling of 3 Monitor Wells - Two underground storage tanks were removed from the property in 1991 by Clearwater. Clearwater Group was retained in 1992 to perform monitor well purging and sampling of three 25 foot deep monitoring wells at a warehouse in Oakland, California. Documentation of monitoring well sampling was included in the written report. The contaminants included diesel and gasoline.

Location: Oakland, California
Client: Major Bank

RESULTS: Site closure was granted April, 1994 after the wells were sampled for one year.

PROJECT: Water Sampling of 39 Monitor Wells: EPA Site - Clearwater Group performed quarterly data collection and sampling for 39 monitor wells at the EPA ARCSWEST Frontier Fertilizer Project. The contaminants included a variety of pesticides.

Location: Davis, California
Client: Bechtel Environmental, Inc. 

RESULTS: The firm's responsive service with rigorous schedules helped with project success