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r (,.)Soil Vapor Extraction and Air Sparging <br /> Performance Monitoring Plan <br /> Stockton Yard Maintenance Facility,Stockton <br /> Page 2-5 <br /> factors which may hinder AS performanceinclude low ambient temperatures,high soil moisture <br /> �J content,low soil permeability, high or low soil pH, or high soil iron concentrations. The August <br /> 1996 AS pilot test revealed adequate soil permeability. <br /> 2.6 Reporting and Recordkeeping Requirements for AS <br /> PMP site inspection records should be retained for at least two years. Following the two-year <br /> period, the data may be archived but should not be destroyed. Any destruction of records must be <br /> done in accordance with regulatory agency approval. <br /> The AS does not require permitting by regulatory agencies. Therefore,no reporting is required. <br /> DAPMP\Stockton Yard PMP.doc <br />