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08 September 1997 AGE-NC Project No. 95-0137 Page 5 of 6 10. Screen auger returns and soil sample duplicates for the presence of volatile organics using an organic vapor meter equipped with a photo-ionization detector (PID) pre-calibrated to isobutylene. 11. Place auger returns on plastic sheeting and store on-site pending analytical results. 12. Decontaminate sampling equipment in an alconox solution and rinse twice with water prior to each sampling run. 13. Steam-clean auger flights after drilling each boring. 14. Ground water monitoring wells will completed as depicted in Figure 3. 15. SVE/IAS wells will be completed as depicted in Figure 4. 16. Analyze selected soil samples for TPH-g, TPH-d, BTE&X and VOCs in accordance with EPA methods 80151n, 8020 and 8240b, respectively. 4.2. SOIL VAPOR EXTRACTION/IN--SITU AIR SPARGING PILOT TEST The following procedures will be performed for the performance of an SVE/IAS pilot test: 1. A portable internal combustion system will be set-up on-site and operated for a period of 8 to 10 hours to determine the subsurface permeability for vapor extraction, radius of influence of the vapor extraction well and the initial hydrocarbon recovery rate. 2. Parameters will be measured at regular intervals throughout the test. Data will facilitate in the design of the SVE system and will be used to determine the number of vapor wells, the spacing of the wells and the selection of vapor remediation system(e.g. internal combustion, thermal oxidation, etc.). 3. A remediation well «°ill be used as the primary extraction well. Other remediation and selected around water monitoring wells will be used to observe the induced vacuum from the source well. Additionally, ground water depths will be measured during the SVE test. 4. Four vapor samples will be collected from the extraction well during the test. Samples will be collected at approximately two hour intervals. The samples will be collected in Tedlar bags and stored in a cool container and transported under chain-of-custody to a State- certified laboratory for analysis. Each vapor sample will be analyzed for TPH-g, TPH-d, BTE&X and MTBE in accordance with the appropriate EPA methods. 5. A compressor-driven unit will be used to inject air into the subsurface using one IAS well. 6. Parameters to be measured throughout the IAS pilot test include: induced pressure at Advanced GeoEnvironmenul,lite.