SCL has contracted with SoundEarth to provide on-call environmental field investigations and analyses, contaminated site evaluation/cleanup oversight, and environmental permitting on an on-call basis. Tasks have included Phase I Site Assessments, preparation of sampling and analysis plans (SAPs), near-surface soil sampling, groundwater monitoring, sediment sampling, remedial investigations and cost estimating, tank assessments, site cleanups, stormwater pollution prevention plans (SWPPPs), and Certified Erosion & Sediment Control (CESCL) inspections.
To date, SoundEarth has conducted environmental sampling at more than a dozen SCL properties. For most SCL properties, the initial phase of sampling involves the collection of surface soil samples in vegetated or landscaped areas within and around the perimeter of the properties. These samples are typically analyzed for pesticides, herbicides, petroleum hydrocarbons, PCBs, and metals. When sample results indicate that surface soil contains concentrations of these contaminants at concentrations exceeding applicable standards, a second phase of sampling is conducted to determine the vertical extent of the contamination. This sampling is conducted by drilling hand auger borings to depths of up to 5 feet in locations with identified contamination and collecting samples at each foot of depth.
When the extent of the contamination has been determined, a remedial excavation is often conducted at these properties to remove the contaminated soil. SoundEarth has completed remedial excavation oversight and confirmational soil sampling at several SCL properties. During the remedial excavation activities, SoundEarth works with an earthworks contractor to remove soil to a pre-determined depth, typically between 12 and 36 inches, and collect soil samples to confirm whether contaminated soil is still present. The excavated areas are then backfilled with clean material, and a closure report is provided to SCL documenting the results of the sampling and remedial action.
SoundEarth has also conducted subsurface soil and groundwater remedial investigations at eleven other SCL properties. These investigations have involved drilling soil borings to depths ranging from 8 to 42 feet below ground surface and collecting representative soil samples to determine the nature and extent of any potential contamination. Groundwater samples are also collected from soil borings and monitoring wells during these investigations. The results of the investigations are used to evaluate cleanup options, feasibility, and costs, and to prepare Cleanup Action Plans for site remediation directed toward regulatory closure.