This web site is currently being upgraded for an improved user experience. Several web pages will continue to retain the former user interface during this transition period.

Remedial Investigation

Printer Friendly View

1.0 Objective of Remedial Investigation The objective of the Remedial Investigation (RI) is to characterize site conditions and fully define the extent of soil and groundwater contamination, both on-site and off-site, to non-detectable concentrations. Information from the RI will be used as the basis for the selection of appropriate remedial alternatives. The RI is necessary only if the extent of contamination cannot be defined at the end of the preliminary site assessment, or there is insufficient site-specific information to evaluate remedial alternatives. Differentiating between preliminary site assessment and RI is necessary to be consistent with terms defined in 23CCR Corrective Action Regulations, as well as the State Local Oversight Agency (LOP) contract. However, GPP encourages the RP to fully define the extent of contamination and collect all necessary geological and hydrogeologic information to evaluate the potential threat to water quality, human health and environmental health in a single phase. Based upon all information collected during the RI, the RP should evaluate remedial options and submit a Feasibility Study Workplan as described in the feasibility study section of these guidelines. 2.0 Remedial Invesetigation Workplan An RI Workplan must be submitted within sixty (60) calendar days from receipt of written request from GPP. Format for the RI Workplan should be consistent with the PSA Workplan format (PSA Section). 3.0 Remedial Investigation Report An RI Report must be submitted within sixty (60) calendar days following completion of the RI. Format for the RI Report should be consistent with the PSA Report format (PSA Section).