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A SITE ASSESSMENT CASE STUDY
major medical office building |
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Snyder Geologic assisted HM Pitt and DPR Construction with managing environmental issues that arose during construction of a seemingly pristine site in San Diego. The site had formerly been a farm and livestock (horse and cattle) property in an affluent area of San Diego County that was being developed for a medical office building. Despite a Phase I Environmental Site Assessment performed by others, several unanticipated environmental issues were discovered during mass grading. Hydrocarbon contaminated soil was discovered (likely from an old farm tank) in an area of the site where a retaining wall was being constructed and over which a building would be developed. On another area of the site, old fill material was encountered, also during mass grading, which contained trash and other debris in addition to heavy metals, pesticides, PCBs, and hydrocarbons. Snyder Geologic worked closely with the team members and the County of San Diego, Department of Environmental Health to develop measures that would mitigate the potential risks to human health and the environment while also reducing the potential need for expensive off-site disposal of some of the contaminated soil. The hydrocarbons near the proposed building and some of the PCB and heavy metal contaminated soil required off-site disposal, and Snyder Geologic assisted with the management of that waste, keeping the amount of waste to a minimum by segregation. An additional 25,000 cubic yards of contaminated, but non-hazardous soil was able to remain on site at depth, and covered by inert (clean) soils. This reuse of soil diverted the soil from local landfills and realized a savings of more than $2,300,000 to the developer. Snyder Geologic also assisted the project by characterizing an additional 25,000 cubic yards of soil on the property as “"inert"” as defined by the Regional Water Quality Control Board, which allowed the soil to be exported as clean fill to other construction projects within San Diego County. This realized a savings estimated in the hundreds of thousands of dollars. |
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