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Buckley Road Area Trichloroethylene (TCE) Investigation (click here for map)

 

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El Consejo Regional de la Costa Central para el Control de Calidad de Agua (Central Coast Regional Water Quality Control Board) está proporcionando esta notificación a propietarios, inquilinos e interesados acerca de nuestra investigación del químico “trichloroethylene”, encontrado en aguas subterráneas en el área de “Buckley Road” en San Luis Obispo. Si desea obtener información en español, póngase en contacto con Hector Hernandez al (805) 542-4641.

Project Description and Background

The Central Coast Regional Water Quality Control Board (Central Coast Water Board) is the lead agency to oversee the investigation of trichloroethylene (TCE) in groundwater in the Buckley Road area, adjacent to the San Luis Obispo County airport (as shown on the map above). The initial investigation area included properties along Buckley Road, Thread Lane (also known as Noll Road), Davenport Creek Road, Evans Road, Angie Lou Lane, Mello Lane, Three Sisters Road, Hidden Springs Road, Edna Road, Windmill Road, Rancho Oaks Drive, Sherpa Ranch Road, and Airport Drive. To date, Central Coast Water Board staff has conducted drinking water well testing of 67 supply wells. Central Coast Water Board staff re-tested 14 selected wells in June through August 2016 and found that TCE concentrations are generally consistent with earlier sampling results. Currently, 13 wells out of the 67 wells tested exceed the drinking water standard for TCE (5 micrograms per liter). The current maximum detected concentration of TCE in a private domestic well is 45 micrograms per liter from a well located on Thread Lane. Based on the distribution of TCE detected in supply wells, Central Coast Water Board staff have focused the primary investigation area to include Thread Lane, Davenport Creek Road, Evans Road, Angie Lou Lane, Mello Lane, and Three Sisters Road, where TCE concentrations are near or above the drinking water standard.

Central Coast Water Board staff required environmental information from several industrial properties on Buckley Road/Thread Lane and from the adjacent airport property. The environmental information and data provided for the industrial properties located on Buckley Road/Thread Lane did not reveal evidence for a source of TCE. Central Coast Water Board staff subsequently began requesting environmental information from San Luis Obispo County for the regional airport property. On June 3, 2016, Central Coast Water Board staff concurred with the County’s workplans for investigating potential sources of TCE on the airport property. The County completed their fieldwork investigation in early September 2016. The results of the soil gas and groundwater investigation indicate that there is no evidence that a source of TCE is present on the airport property. Given the results from the County’s soil gas and groundwater investigations, the next step is for additional investigation and delineation of TCE in the industrial area overlying the highest concentrations of TCE along Thread Lane. Central Coast Water Board staff issued letters requiring work plans from Thread Lane business property owners to conduct additional investigations; the results from those investigations are due May 5, 2017. Additional details on the County’s investigation and the additional investigation requirements for Thread Lane property owners are provided in the section below entitled “Buckley Road Area TCE Investigation Reports and Correspondence”.

Central Coast Water Board staff has created this website to help provide residents with current information. An email subscription (“Lyris”) for the Buckley Road Area TCE Investigation has also been developed to keep interested parties notified of current events (you can subscribe to the email list by clicking the link at the top of this web page underneath the map).

Check for updated information in the “Announcements & Public Notices” and “Buckley Road Area TCE Investigation Reports and Correspondence” section below. The most recent announcements will be at the top of the list. A summary of Central Coast Water Board actions are also available under the “Executive Officer’s Report” in the following section.

Announcements and Public Notices

Buckley Road Area TCE Investigation Reports and Correspondence

2017 THREAD LANE AREA INVESTIGATION

2016 THREAD LANE AREA INVESTIGATION

SAN LUIS OBISPO COUNTY REGIONAL AIRPORT INVESTIGATION

Executive Officer's Reports for the Buckley Road Area TCE Investigation

Resources for Private Well Owners

    TCE TREATMENT OPTIONS AND SAMPLING RESOURCES FOR PRIVATE WELLS
    HUMAN HEALTH RISK INFORMATION

Contacts

    CENTRAL COAST WATER BOARD