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41 • Appendix A • The SUMMA canister sample will then be stored away from excessive he t or cold pending shipment to the fixed laboratory under chain of custody protocol in accordance with the protocols in Section A1.5. A1.2.5.3.2 Formaldehyde by EPA TO-11 A low flow pump(e.g. SKC AirCheck PCX), low flow adjustable needle valy , flow meter(e.g.BIOS DryCal Lite),and"T-valve"will be attached to the end of the sampling line. rhe"T-valve"will be positioned on the line before the flow meter and the pump. The sorbent tube N 611 be introduced in line between the"tee"valve and the pump and an additional volume of 1-15 liters of air will be allowed to pass from the sampling line through the sorbent tube. Flow rates before and after sample collection will be measured and recorded as well as the elapsed time of sampling. A1.2.5.4 Temporary Probe Abandonment Following sample collection,the temporary soil vapor probe will be removed ing the direct push drill rig and the borehole will be backfilled with hydrated bentonite. Surface rest o tion will consist of manually patching the probe hole with soil,asphalt,or concrete to match exisi ing conditions. A stake will be driven and labeled with the sample ID at each abandoned soil vapor pi obe location. The probe rods and screened sampling tip will be decontaminated prior to use at another sampling location. A1.3 Quality Control (QC) Samples Field QC samples will be generated to evaluate the precision, accuracy,and integrity of field sampling and laboratory analytical procedures. QC samples are represented by control samples introduced into the sample analysis stream. Field QC sample frequency is based on the total nun her of samples submitted, and the type and frequency of the investigative process that is being monitore i. The following QC samples will be employed during the field program. A1.3.1 Trip Blanks Trip blank samples are used to monitor for possible contamination of VOCs i ri samples due to original contamination in laboratory supplied media,or field induced contamination& m sample collection, handling,or shipping techniques. Trip blanks samples for EPA Method 8260B are prepared by the laboratory u sing contaminant free water (e.g.,nitrogen purged deionized water)which is poured into VOA vials and shipped by the laboratory along with sample containers for VOC analysis. Trip blanks will accompany sample containers into the field and will be shipped back to the laboratory with every cooler that contai s liquid samples for VOC analyses. Trip blanks will be analyzed for all VOC analytes specified for sat iples in the corresponding cooler. Trip blank samples for soil vapor samples will consist of laboratory supplied media(SUMMA for EPA Method TO-15 and sorbent tube for EPA Method TO-11)that will travel wit the samples,and will be submitted with the samples for analysis,but will not be exposed for sample llection. One trip blank sample per matrix will accompany each shipment of soil vapor samples A1.3.2 Field Duplicate Samples Field duplicate samples are submitted to the contract laboratory for the purpose of assessing the precision of the field sample collection and laboratory analysis techniques. The labon tory will not be informed of KB61125 APPENDIX A MACTEC Engineering and Consulting, Inc. A7 September 28,2005