OCWD Management Area
Figure 11-3: North Basin Groundwater VOC Plume
South Basin Groundwater Protection Program
Groundwater contaminated with VOCs and perchlorate in the South Basin area of the groundwater basin is shown in Figure 11-4. Elevated concentrations of perchloroethylene (PCE), trichloroethylene (TCE), and perchlorate were detected in Irvine Ranch Water District’s Well No. 3, located in Santa Ana. OCWD’s remedial investigation has resulted in the delineation of an approximately 2-mile long comingled contaminant plume. With the remedial investigation complete, OCWD is proceeding with a feasibility study to evaluate and develop remedial measures in cooperation with regulatory agencies and stakeholders following the NCP process. In tandem with OCWD’s remediation program to address off -site contamination, the Regional Water Board and DTSC are overseeing investigation and remediation activities at the contaminant source sites.
MTBE Remediation
In 2003, OCWD filed suit against numerous oil and petroleum-related companies that produce, refine, distribute, market, and sell MTBE and other oxygenates. The suit seeks funding from
BASIN 8-1 ALTERNATIVE 2022 UPDATE
Sustainable Management: Water Quality 11-3
Appendix F - 169
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