Shannon Road/El Camino del Cerro

Registry placement date: Shannon Road-Rillito Creek site on April 23, 1999; El Camino del Cerro site on Aug. 18, 1998; the two sites were combined in January 2005 based on sampling results showing a single plume

Score: Shannon Road-Rillito Creek site is 53; El Camino del Cerro site is 71

County: Pima

Location: Northwest Tucson, approximately bounded by a quarter mile north of Rillito Creek, El Camino del Cerro Road on the south, Meadowbrook Park on the east and the Santa Cruz River on the west with industrial properties, residential properties and a former landfill that occupies approximately 20 acres in the southwest portion

Contaminants of concern: Tetrachloroethene (PCE), trichloroethene (TCE), 1,1-dichloroethene (1,1-DCE), 1,1-dichloroethane (1,1-DCA), cis-1,2-dichloroethene (cis-1,2-DCE), vinyl chloride and benzene

Action taken: The contaminant plume impacted three community wells, which were removed from service. One of these wells now has a wellhead treatment system removing volatile organic compounds (VOC) to meet drinking water standards.

Status: The final remedial investigation (RI) and proposed remedial objectives (RO) reports were completed in April 2015.

Community Advisory Board (CAB): Established and meets on a regular basis