Land Use Control Implementation Plan for IR Sites 1 and 2, Navy Auxiliary Landing Field (NALF), San Clemente Island, CA.

This task order includes the preparation of a Land Use Control Implementation Plan (LUCIP) for NALF San Clemente Island. Land Use Control Remedial Designs (LUC RDs) were prepared for Installation Restoration (IR) Sites 1 and 2 on San Clemente Island.

The objective of this task order was to prepare a facility-wide Land Use Control Implementation Plan (LUCIP) and Land Use Control Remedial Designs (LUC RDs) for Installation Restoration Program (IRP) Sites 1 and 2 at Navy Auxiliary Landing Field (NALF), San Clemente Island (SCI), California.

GCE prepared the LUCIP and appended LUC RDs to implement the Land Use Controls (LUCs) identified in the Record of Decision (ROD) as part of the selected remedial alternative for the site. The LUCIP included standard operating procedures for any necessary intrusive work to ensure that the engineering controls (ECs) for the site are maintained or similarly effective ECs are established, if required. In addition, the LUCIP evaluated whether or not institutional controls (ICs), such as deed restrictions, were required. Once the LUCIP was finalized, all required LUC information was uploaded to the LUC tracker in the NEDD/NIRIS portal.

IRP Site 1

IRP Site 1 (Lemon Tank Canyon Disposal Area) is approximately 4 hectares and is located on the northeastern side of SCI off San Clemente Ridge Road. IRP Site 1 was reportedly used for disposal intermittently from the 1940s to 1980. Visual evidence and physical remains of the dump site are still evident in the form of sparsely scattered waste across the surface of the site and piles of accumulated debris along and over the cliff edge. A time critical removal action (TCRA) was performed on an approximately one-acre area within IRP Site 1 to address contamination left by historical debris staging and disposal associated with former hazardous waste disposal practices. The primary contaminants of concern included polychlorinated biphenyls and metals, such as cadmium, copper, lead and zinc. The TCRA was completed in February 2012. The residual risk assessment showed there is potentially unacceptable risk to human health for the hypothetical residential scenario along the cliff edge where it was impractical to excavate further. As such, the Navy agreed to implement LUCs for the cliff edge as part of the final remedy for the site. The Navy also agreed perform post-TCRA vegetative maintenance activities to control erosion and restore habitat disturbed during the soil excavation activities.

IRP Site 2

IRP Site 2 consists of two shallow drainages that historically received wastewater discharged from the former photography laboratory (FPL), which was located in Building 60241 on SCI. The drainages are located south of the southern central portion of FPL (Southern Drainage) and on the west side of Photosonic Road west of FPL (Western Drainage). The TCRA at IRP Site 2 was initiated to address elevated silver concentrations known to exist in soil due to wastewater discharged from the FPL. Delineation, excavation, and disposal of silver impacted soil at or exceeding the risk-based concentration cleanup goal for silver of 31 milligrams per kilogram was completed in 2009. At the end of the silver impacted soil removal action it was determined that other contaminants of potential concern (COPCs) besides silver were present at the site in concentrations that might pose a potential risk to human health and the environment. Other COPCs that were found to exceed site preliminary screening values included arsenic, cadmium, copper, total cyanide, lead, molybdenum, nickel, selenium, zinc and selected semivolatile organic compounds. Additional site assessment and delineation of impacted soils was performed, and the work plan was revised to address additional areas and COPCs. The remaining fieldwork required to complete the TCRA was accomplished in 2013.