Construction on State Highway – Merced, CA

Project Overview: Summit Environmental Contractors reevaluated statistical processes initially performed by a CalTrans Consultant. Summit’s analysis involved reassessing consultants four scenarios for northbound and southbound data evaluation and introducing a fifth scenario using similar statistical methodologies applied to the original total lead data evaluation. The primary objective was to systematically remove sample points with the highest concentrations of aerially deposited lead (ADL) until the upper one-sided 95% confidence limit (UCL) for total lead concentration (TTLC) was reduced below the hazardous waste criteria of 5.0 milligrams per liter (mg/L).

Location: The project spanned Childs Avenue overcrossing to Franklin Road overcrossing on State Highway 10-MER-99-R12.7/17.8 in Merced County, California.

Key Activities:

  • Application of statistical methods for data reevaluation, including the use of Pro UCL statistical modeling to calculate the arithmetic means of total lead concentrations for each sampling depth.
  • Examination of the correlation between total and wet lead concentrations to predict wet lead concentrations based on recalculated UCLs.
  • Systematic removal of samples with the highest TTLC concentration values to achieve compliance with hazardous waste criteria.

Outcome: Summit’s statistical reevaluation successfully reduced the 95% UCL TTLC below the hazardous limit of 5.0 mg/L for specific boring locations. Consequently, the recommended total volume for removal was reduced from 10,965 cubic yards (y3) to approximately 1606.80 y3. This outcome suggests a significant potential for reducing the hazardous Type Z-2 material quantity requiring removal from the site. Summit recommends that Teichert collaborates with the owner to implement these findings and optimize the removal process.

Recommendation: Based on the findings, Summit advised the implementation of the reduced removal volume strategy. This would streamline the removal process while ensuring compliance with environmental regulations and minimizing environmental impact.

 

Highway Soundwall and ADL Remediation Project – Los Angeles, CA

Project Overview: Summit successfully executed the excavation, transportation, and disposal of Type Z-2 aerially deposited lead (ADL) material for the LACMTA Soundwall Package 10 project. This comprehensive project, managed by C.A. Rasmussen, Inc. (Rasmussen), was part of Highway and City Street Construction Activities in Los Angeles County.

Location: Various locations on Route 210 from 0.1 mile west of Marango Avenue overcrossing to 0.1 mile east of the Santa Anita Avenue undercrossing (Location A), and on Route 134 from 0.08 mile east of the Ledge Avenue undercrossing to 0.02 mile west of the Forman Avenue undercrossing (Location B) in Los Angeles County, California.

Scope of Work: The project encompassed precise planning and execution, focusing on the remediation of ADL-contaminated material. C.A. Rasmussen, Inc. performed the excavation, transportation, and disposal activities on Route 210 (Location A) from 0.1 mile west of Marango Avenue overcrossing to 0.1 mile east of the Santa Anita Avenue undercrossing, as well as on Route 134 (Location B) from 0.08 mile east of the Ledge Avenue undercrossing to 0.02 mile west of the Forman Avenue undercrossing.

Key Activities:

  • Excavation of Type Z-2 ADL material
  • Safe transportation of Hazardous material
  • Disposal in accordance with regulatory requirements

Environmental Considerations: Given the nature of the project, environmental considerations were paramount. Summit implemented stringent measures to ensure compliance with environmental regulations, safeguarding both public health and the surrounding ecosystem.

Outcome: Summit successfully completed the ADL remediation project, contributing to the enhancement of soundwall infrastructure along Route 210 and Route 134 in Los Angeles County. The project stands as a testament to Summit’s commitment to excellence in environmental services and safe construction practices.

Soil Remediation – Sacramento County

Location: Various locations in District 3 on Route 51, 80, and 244, Sacramento County, California

Project Overview: Summit undertook the excavation, transportation, and disposal of 5,820 cubic yards (y3) of aerially deposited lead (ADL) contaminated soil for the California Department of Transportation (Caltrans). This project addressed environmental concerns related to construction activities on State Highway infrastructure.

Scope of Work: The project involved meticulous planning and execution to manage ADL-contaminated soil encountered during various site activities, including excavation, loading, and unloading Bins or trucks, transportation, and disposal. The team adhered to the Special Provisions outlined in Caltrans Contract 03-2H15U4 and the accompanying construction plan sheets.

Key Activities:

  • Excavation of 5,820 cubic yards of California Hazardous soil
  • Loading and unloading of containers and trucks
  • Safe transportation and disposal for 305 trucks
  • All work in accordance with regulatory requirements

Environmental Compliance: Summit implemented an Lead Compliance Plan and Excavation Transportation Plan, including measures for the proper handling, transportation, and disposal of contaminated material. The project team adhered to stringent guidelines to minimize environmental impact and protect public health.

Outcome: Through planning, adherence to regulatory requirements, and the expertise of our team, Summit successfully managed the remediation of ADL-contaminated soil, contributing to the safe and responsible construction practices on State Highways in Sacramento County.

This project exemplified Summit’s commitment to environmental stewardship, safety, and excellence in providing specialized services for infrastructure development.

Carmenita Interchange – Santa Fe Springs, CA

Summit provided environmental consulting and contracting services as part of the Interstate 5/Carmenita Road Interchange project. The construction included the removal of the existing two-lane over-crossing at Carmenita Road, realignment of existing frontage roads, and construction of a tight diamond interchange with a new Carmenita Road over Interstate 5 and the Union Pacific Railroad crossing.

Services included preparation of a health and safety plan, excavation and transportation plan, lead compliance plan, sampling, and analysis plan, and transportation and disposal plan outlining the requirements for the handling of contaminated material. Fieldwork included geotechnical drilling of seventy (70) soil borings to approximately sixty (60) feet below ground surface to determine the location and thickness of the impermeable layer above the Artesia Aquifer, collection and testing for 7500 soil samples from over twenty (20) excavations and 250  soil stockpiles. Along with the transportation and disposal for 60,000 tons of contaminated soil.

 

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State Highway Route 210 – Los Angeles, CA

Summit provided both in charge environmental consulting and contracting services as part of Highway Construction Activities in District 7 Route 210 from Interstate 5. Summit’s scope of work included Metrolink right-of-way improvements by excavating, loading, transporting, and disposing of a total of 2,305 Tons of hazardous and contaminated material at a proper landfill.

Services included preparation of an excavation and transportation plan, lead compliance plan, sampling, and analysis plan, and transportation and disposal plan outlining the requirements for the handling of contaminated material. Field work also included air monitoring, sampling, and training for hazardous materials.

 

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State Route 33 – Fresno County,  CA

This project involves the excavation, loading, transportation, and disposal of 2,670 tons of Type Z-2 impacted hazardous material.

Services included preparation of a health and safety plan, excavation and transportation plan, lead compliance plan, sampling, and analysis plan for potential environmental impacts due to ADL from motor vehicle exhaust in the surface and near-surface soils on the roadway within the project boundaries, and transportation and disposal plan outlining the requirements for the handling of contaminated material. The Type Z-2 contaminated material was removed from the Right-of-Way shoulder areas along northbound State Route 33 from Post Mile 69.3 to 70.9 in Firebaugh, Fresno County, California, by directly loaded it into end-dump trucks and transported for disposal at a Class I disposal site.

Other fieldwork included sampling and testing for contaminates and air sampling and worker training for lead.

 

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Demo-4

Valley View Interchange – La Mirada, CA

Summit provided both in charge environmental consulting and contracting services for the 200 million dollar Valley View interchange construction project for the California Department of Transportation (Caltrans). The construction job consisted of the widening of both the Valley View overcrossing and the I-5 freeway. As part of the construction, thirteen industrial properties and several government owned parcels previously determined to be contaminated required to be excavated, stockpiled, sampled, characterized and transported for proper disposal.

Summits scope of services included the completion of the following plans: Site-Specific Health and Safety Plan, Sampling and Analysis Plan, Excavation Plan, Transportation Plan, and a Stockpile Management Plan. The field services provided included the sampling and analytical testing for 1200 stockpiles and 6000 samples and the characterization transportation and disposal for more than 42,000 tons of contaminated material. In addition, Summit performed dewatering, sampling, and liquid disposal for more than 400,000 gallons of contaminated liquid.

Summit received high marks for safety, communication, efficiency and overall performance.

 

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Interstate 710 – Los Angeles County, CA

Summit Environmental Contractors provided environmental contracting services for construction activities located along an approximate 3.5-mile segment for both the north and south bound Interstate 710. Health and safety training was also conducted to protect workers and the public from hazards. Field work included sampling, testing and air monitoring for 1146 Compliance. Due to the high level of Aerially Deposited Lead (ADL) 6,417 Tons of hazardous material was removed and disposed of at a Class I landfill. Summit prepared a Lead Compliance Plan (LCP) and an Excavation and Transportation Plan (ETP) for the proper operating procedures of handling and transporting lead.

 

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Santa Clarita

Interstate 5 – Santa Clarita, CA

Summit Environmental Contractors worked with Granite Construction Company as a subcontractor providing the transportation and disposal for over 8,100 tons of Cal-Haz material. Services provided include a lead compliance plan (LCP) and an excavation and transportation plan (ETP) as well as sampling and testing and air monitoring and training.

 

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