Amendment 5 PPI-31_P-204 Soil Guidance Section for NEPA-PAMS.pdf

Soil Guidance for P-204

The project site is located within OU-14 onboard the Air Station. This site location is in an area of known POL or chemical spills. Pre-characterization or soil sampling is not required prior to excavation. This information is provided to give the contractor's Industrial Hygiene Department to incorporation into their Health and Safety Plan to ensure worker safety.

If any soil which exhibits an abnormal or unnatural color, a chemical or petroleum odor, or is saturated with a chemical or petroleum is encountered during excavation, work should be immediately stopped in that area, and the Environmental Affairs Department (EAD) should be advised of the situation so that a course of action can be developed to address the contamination. No soil sampling or testing is to be conducted for the purpose of determining suspected contamination without consulting MCAS Cherry Point’s Environmental Affairs Department for proper procedure and guidance.

All excavated soil may be re-utilized as backfill at the same location from which it was removed unless petroleum contamination is discovered. If petroleum contamination were discovered, the soil would need to be segregated by PID (>/= 10 ppm or exhibits staining), properly stockpiled, tested, and disposed. If soil is to be stockpiled, then it should be stockpiled on plastic, bermed, and covered in accordance with NC DENR Groundwater Section Guidelines for the Investigation and Remediation of Soil and Groundwater, Vol. 1 dated July 2000 (Guidelines), or placed in a rolloff container and covered with plastic.

For this site located in the OU-14 boundary, any excess soil that cannot be re-utilized as backfill at the same location from which it was removed must be disposed of at a Subtitle D landfill facility at a minimum. Soil testing will be required. EAD must review and sign the waste manifests/bill of lading for the soil disposal prior to any of this soil leaving the Air Station. The manifest should also contain the amount of soil (weight) and supporting laboratory results for EAD to review. One composite sample must be taken and analyzed for each 200 cubic yards of the stockpile per DENR Guidelines in order to determine the proper method for disposal if contamination is detected. If contamination is discovered, the stockpile sample(s) shall be analyzed for the following but not limited to:

Std Method 5030 sample prep with Modified 8015 (CA GC-FID Method) - Gasoline Range Organics, Std Method 5030 and 3550 sample prep with Modified 8015 - Diesel Range Organics, EPA Method 9071 - Oil & Grease with Silica Gel wash

With possible TLCP

All soil materials that are sourced from off Government Property (Off Site Soils) will require analytical review and approval before use by the project. A Request For Off-Site Soil & Soil Authorizing forms can be completed through MCAS-CP EAD for this action.

If any action needed to complete the project, must intrude into the water table for any reason, the EAD must be notified and a health and safety plan for the work must be written for approval by EPA and NC State Environmental officials. Will Potter with MCAS-CP EAD will give guidance for this task. This action can be time consuming, so please let EAD know ASAP.

All disturbed areas must also be capped by either (1) covering the surficial soil with an impervious material such as concrete or asphalt, or (2) topping the excavated area with 12 inches of compacted, clean fill. Capping is required to prevent an increased exposure risk from both surficial exposure and contaminant leaching. Therefore, backfilled soils must be compacted to minimize infiltration of surface water through the soil column.