Environmental Experience – Total Petroleum Hydrocarbon Impacts

Posted by & filed under Blog, Environmental.

Broadbent managed a project in Sparks, NV, where a diesel fuel release was discovered, emanating from a failed dispenser piping bushing (the facility operates two diesel fuel underground storage tanks (USTs), one 5,000 gallon capacity and one 8,000 gallon capacity). Initial soil sampling assessment activities, conducted via hand sampling at the point of release, found total petroleum hydrocarbon (TPH) diesel impacts present at 1,700 mg/kg and 16,000 mg/kg. Subsequent soil characterization activities were conducted via installation and sampling of two GeoProbe soil borings, found TPH diesel impacts present at 1,100 mg/kg in one boring at ~10.5 feet below land surface (bls), and 2,500 mg/kg in the second boring at ~15 feet bls. Additional site characterization activities were conducted using drilling Read More »

Environmental Experience – Heating Oil and Underground Storage Tanks

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Broadbent has been providing professional Certified Environmental Manager (CEM) services to a large Nevada School District, relative to heating oil underground storage tanks, since 1996. This includes work at numerous facilities, within the past five years. Conducted activities include: preparation of tank removal contractor specifications; contractor bid solicitation; contractor selection; oversight of tank cleaning and removal activities; collection of tank closure assessment samples; and preparation of Tank Closure Assessment Reports. Where impacts (primarily diesel range organics and some MTBE) have been discovered, additional site characterization activities have been conducted, including: Work Plan preparation and implementation; soil boring drilling and soil sample collection (using multiple drilling techniques, including GeoProbe, Hollow stem auger, air rotary, and sonic); soil boring completion as groundwater Read More »

Environmental Experience – Groundwater Monitoring, Sampling, and Reporting

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As a sub-contractor, Broadbent has been providing services to a nationwide environmental contractor, at numerous sites throughout California, since 2009. Work has taken place throughout Alameda, Butte, Contra Costa, Los Angeles, Monterey, Napa, San Francisco, San Mateo, Santa Cruz, Solano, Sonoma, and Yolo counties. Provided services include quarterly and semi-annual groundwater monitoring and sampling activities and subsequent report preparation and submittal. Additional activities performed for the client include acquisition of encroachment permits assistance in obtaining case closure data management and review historical document review traffic control subcontractor coordination, biogeochemical monitoring, and light non-aqueous phase liquid (LNAPL) gauging and recovery. Broadbent is currently working on 34 of these sites for the client throughout California, but primarily in northern California.

Case Study on Landfill Closure Plan & Monitoring

Posted by & filed under Blog, Emergency Response, Environmental.

Broadbent provided consulting services to a solid waste contractor, producing everything needed for a complete landfill closure plan an unlicensed active solid waste disposal site in Butte County, California. Broadbent delineate the vertical and lateral extent of contamination associated with the illegal burning and dumping at the site. Illegal dumping of solid waste including automobiles, appliances, and trash had occurred at this location for many years. The waste was typically burned in an effort to reduce its volume and covered with soil. Contaminants of concern included metals, petroleum hydrocarbons, polycyclic aromatic hydrocarbons, dioxins and furans. After executing a Work Plan for Preliminary Waste Characterization Study, Broadbent prepared the Waste Characterization Study Report. Broadbent then prepared a Removal Action Work Plan Read More »

Environmental Experience – Soil and Groundwater Investigation and Remediation

Posted by & filed under Blog, Environmental.

In 1994, two releases of petroleum hydrocarbons were discovered in the underground storage tank (UST) system at a major rental car facility at McCarran International Airport in Las Vegas, Nevada. Since 1995, Broadbent has performed investigation and remediation of soil and groundwater at the facility and properties downgradient of the facility that have been impacted by the release. Two additional facilities upgradient of the rental car facility have also had confirmed releases and have been identified as additional contributors to the impacted groundwater found in the vicinity of the rental car facility. The axis of the commingled shallow (20 to 25 feet below ground surface) dissolved methyl tertiary-butyl ether (MTBE) groundwater plume associated with these releases historically extended over 5,000 Read More »