SCH Number 2021010007

Project Info

Title

Monterey MGP Substation Remediation - Soil Feasibility Study and Remedial Action Plan

Description

The Feasibility Study/Remedial Action Plan identifies the selected remedy to address impacts to soil and groundwater from previous operations at the Site. The soil constituents of potential concern included polycyclic aromatic hydrocarbons, total petroleum hydrocarbons, volatile organic compounds, heavy metals, and cyanide. In addition, polychlorinated biphenyls, which are not related to MGP operations, were later detected in soils.The selected remedy consists of excavated of impacted soils within the project area and off-Site disposal. The excavated soil will require loading into trucks, possible stockpiling, and ultimately off-site disposal at a permitted disposal facility. Upto 10,000 cubic yards of impacted soils will. This soil will be hauled off-site in approximately 700 truckloads. An equivalent volume of clean soil will be imported for use as backfill. Soil gas confirmation sampling will also be conducted following completion of the remedy from temporary soil gas wells installed at the time of Site restoration, or at a later date. New groundwater monitoring wells will also be installed. Following remediation, the Site will be restored to previous conditions and monitoring will be performed. Institutional controls in the form of a land use covenant will be placed on all parcels within the Site to prohibit groundwater use and sensitive land uses (e.g., single family residences, schools, day care centers) because residual impacts will continue to exist above levels acceptable for unrestricted use of the Site.

2 documents in project