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k" K L E I N F E L D E R <br /> i <br /> i <br /> 1f 4.3.3 SAMPLING SCHEDULE <br /> J <br /> To track the performance and effect of the pilot system on the subsurface, specific components of <br /> the remediation system will be sampled regularly. Sampling protocol will serve the following <br /> obj ectives: <br /> • determine the magnitude of contamination being removed <br /> • determine the radius of influence of the air sparging system <br /> • determine the effect of air sparging on dissolved groundwater parameters <br /> Air sampling will be completed by collecting soil gas samples with SUMMA® canisters for <br /> laboratory analyses and by using the PID. A vacuum pump will purge at least two volumes from <br /> the vent well prior to soil gas sampling. The purge volumes will be calculated prior to sampling <br /> based on the diameter and length of the tube or well casing. <br /> After'purgin , a negatively pressurized SUMMA° canister will be connected to <br /> g g Y p the sampling <br /> port and the valve on the canister will be opened to fill the canister with soil gas. The canister <br /> will be labeled and delivered to the designated laboratory under chain-of-custody control at <br /> ambient temperature. The SUMMA°. canister samples will be analyzed for volatile organics, <br /> including TPH, BTEX and DCA using EPA Method TO-14. <br /> Air sampling will also be completed with the PID meter. The instrument will be calibrated and <br /> recorded at the beginning of the day then checked and recorded again at the end of the day. <br /> Proper calibration standards will be used consistent with the manufacturer's specifications. PID <br /> results will be compared with analytical results taken at the same time and location to roughly <br /> calibrate the PID for contaminants of concern. <br /> Dissolved oxygen in the groundwater in the nearby monitoring wells will be measured with a <br /> portable dissolved oxygen meter. The instrument will be calibrated and recorded at the <br /> beginning of the day then checked and recorded again at the end of the day. Proper calibration <br /> standards will be used consistent with the manufacturer's specifications. Dissolved oxygen results <br /> will be compared with baseline readings and used to track oxygen migration in the groundwater <br /> due to air sparging. <br /> 1 <br /> 12280/2002R476 Page 17 of 26 <br /> Copyright 2002 Kleinfelder,Inc. May 17,2002 <br />