PG&E operated a former manufactured gas plant (MGP), which was located within the block bound by Waldon, California, Gold and South Streets in Redding, California. The manufactured gas plant operated from 1886 to 1947. PG&E acquired the plant in 1919 and operated it until its closure. The facility was then dismantled, except for the gas holder, which was removed in the early 1960s. PG&E later sold portions of the property, which have since been used for a variety of commercial and industrial uses. A gas regulator station operates on the portion of the property still owned by PG&E to monitor and adjust the pressure of natural gas pipelines.
In September 2000, PG&E conducted an environmental investigation at the site and found that soil and groundwater were impacted by manufactured gas plant-related constituents. As a result, from 2002 to 2004, PG&E completed soil removal and groundwater collection and treatment at the site. Soil was also removed in the streets to the greatest extent possible due to existing infrastructure. All work associated with the former manufactured gas plant is being overseen by the California Department of Toxic Substances Control (DTSC) and in coordination with Central Valley Regional Water Quality Control Board (Water Board).
Groundwater at and in the vicinity of the site in its current condition meets the general and media-specific criteria described in the DTSC’s approved Request for Low Risk Groundwater Closure Report letter dated October 8, 2014. As a result, all monitoring wells at the site were decommissioned as presented in the DTSC approved Well Abandonment Report dated January 28, 2016 and addendum to the Well Abandonment Report dated April 27, 2016. Final documentation in support of site closure includes the DTSC-approved Soil Management Plan (SMP) and a Land Use Covenant (LUC) which is presently under preparation by DTSC. We anticipate final site certification in mid-to-late 2016.
PG&E has worked closely with nearby neighbors and the broader community to inform them of past work and to seek public input. PG&E will continue to keep the community informed about this project through fact sheets, work notices and other outreach, as appropriate.
There is no indication that PG&E's former MGP sites pose any health concerns to the public, based on our testing, experience, and extensive review of medical literature.