SWMU 13 – Old Pest Control Shop/Building 258

SWMU 13 includes the Old Pest Control Shop Area where Building 258 was demolished and the surrounding area. Pesticides were dumped into the soil and into a drainage ditch behind the building. The ditch discharges into the nearby bay (Ensenada Honda). During IR investigations, composite soil samples, sediment and surface water samples, and groundwater samples were collected. Due to levels of few contaminants in the samples, an RFI of soils and sediments was required. Provisions were made for additional groundwater investigations, based on the results of the soil and sediment investigations.

Status

RFI work plans were approved in 1995.
Initial investigations under RCRA corrective action verified the earlier findings that low levels of pesticides were found in site soils but they found to pose no human health risk. Higher levels were found in the drainage ditch, which could pose a human health and/or ecological risk if a complete pathway is present. In addition, groundwater levels of pesticides were significant enough to warrant additional investigation.
A work plan for additional investigations was submitted and subsequently approved.
The investigations were performed.
No significant risk found for any media except the drainage ditch sediments.
An outline for a streamlined CMS was submitted in December 1998 and the streamlined CMS submitted in April 1999. Following agency comments, the Final CMS was submitted in October 1999. The Revised Final CMS was submitted in January 2000 and approved in March 2000.
The Draft CMI Work Plan Design Package was submitted in July 2000.
The Revised Final CMS Final Report was submitted in August 2000.
Following agency comments, the Final CMI Work Plan Design Package was submitted in November 2000. The 100% Final CMI Work Plan Design Package was submitted in January 2001.
The CMI was initiated in CY 2006.
A Draft Project Closeout Report - Remedial Action for Soil Remediation was submitted to the EPA on December 4, 2009.