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Site 31

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IRP Site 31 - Central Ravine

IR Site 31 is a former disposal area in the northwestern corner of DFSP San Pedro, in a steeply sloped west-to-east ravine that is heavily vegetated. Disposal activities in the ravine took place between 1972 and 1984 and included construction debris and miscellaneous waste. Debris in the ravine include concrete rubble, asphalt, brick, wood, and reinforcement bars. The ravine is not entirely filled with debris.

Sample results from the 1993 Site Investigation (SI) and the 2015 expanded SI indicate the presence of pesticides, PCBs, and various metals at concentrations above preliminary screening levels. The 2015 expanded SI recommended that a Remedial Investigation be performed. The Remedial Investigation is scheduled to begin in 2019. 

Quick Facts
Size 12 acres
Location Northwestern corner of base
Contamination Source Disposal area
Potential Waste Types Pesticides, PCBs, and metals
Status Remedial Investigation
Est. Response Complete 2025

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