Tag: intrusion
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Soil and Soil Gas Investigation, San Fernando Valley, California
When seven production wells operated by a Southern California water purveyor reported concentrations of hexavalent chromium and perchlorate above regulatory limits for drinking water, a multiagency effort was conducted to identify the sources.
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Closure Plans for Contaminated Sites and Regulatory Closure Negotiations
Closure plans are prepared to supplement work plans for contaminated sites when a property owner is interested in obtaining No Further Action letters from the lead regulatory agency. Closure plans provide a description of administrative and technical requirements and factors supporting closure, including cleanup goals based on indoor vapor intrusion pathways and groundwater intrusion pathways. …