ARCHIVED REPORTS_TEMPORARY SOIL GAS PROBE PERMIT APPLICATION PACKAGE

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SOP TO-14A/15 ' Rev 4 December 2007 ' 9.1 Soil Vapor/Air Samples It is the responsibility of the field scientist to ensure that all vapor samples are collected in accordance with ' regulatory protocol. Samples should be collected in gas tight syringes, Tedlar bags or other vessels designed to prevent the loss of volatile compounds. Holding times for the various sample vessels should be observed. H&P will observe maximum holding times of 72 hours for Tedlar bags, 2 hours for syringe samples, 30 days for Summa or other passivated canisters unless changed or as required by regulatory decree (DTSC requires a 3 day holding time for summas). ' Once vapor samples have been collected, they should immediately be placed on the autosampler or in an appropriate container away from sunlight. ' 9.2 Laboratory Acceptance of Samples The laboratory operator accepts samples from the field. Samples should be delivered with the appropriate ' chain-of custody (COC) form. The lab operator should immediately inspect the samples against the chain- of-custody. The COC must contain ' Unique sample identifier for all samples Date and time of sampling Source of sample including name, location and sample type ' Analyses required Name of collector Pertinent field data ' Serial numbers of custody seals and transport cases (if used) Custody transfer signatures and dates and times of sample transfer from the field to transporter and the lab Bill of lading or transporter tracking numbers (if applicable) ' The laboratory operator will check the COC for the above criteria in reference to the applicable methods. If any discrepancies are found, the laboratory operator should document those on the COC or in the daily analysis logs. The custodian should also immediately inform the field personnel of the problem. No samples whose name or other information is in question should be analyzed. Once sampling personnel have solved the problem analysis can begin. Samples awaiting analysis are temporarily stored in the mobile ' laboratory refrigerator separate from those containing analytical standards. 10.0 Handling and Preservation The purpose of this section is to describe the standard procedures used to assure that samples can be related to their data. ' 10.1 Soil Vapor Samples As is the case with soil and water samples, it is the responsibility of the field scientist to ensure that all vapor samples are collected in accordance with regulatory protocols. Samples should be collected in gas tight ' Page 9 of 24 1