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• Collected samples, accompanied by a trip blank, were placed immediately in an ice - <br />filled cooler for transport to a state -certified testing laboratory. Samples were kept <br />chilled (at about 4°C) until delivery. <br />• A completed Chain -of -Custody form, detailing the sample I.D. numbers, date and <br />time collected, analyses requested, and other project information, accompanied each <br />sample to the laboratory. The Chain -of -Custody forms were signed and dated by all <br />personnel retaining custody of the samples (Appendix Q. <br />Surface -Water Sampling <br />The sampling protocols listed below were generally followed during surface water <br />sampling operations. <br />• Surface -water sampling was performed by submerging laboratory -supplied sample <br />containers, or a decontaminated dipper, in a slow moving portion of the surface water <br />channel at the designated sampling station. <br />• Sample preservation, order of collection, and Chain -of -Custody procedures described <br />above for groundwater sampling were also adhered to for surface water sample <br />collection. <br />Soil -Pore Gas Sampling <br />Soil -pore probes at the French Camp Landfill were sampled as follows: <br />• Field measurements were completed using a Landtec GEM 2000 (or equivalent) that <br />was calibrated daily with methane, carbon dioxide, and oxygen. <br />• Each soil -pore gas probe was purged of at least one casing volume prior to recording <br />the measured gas concentrations. <br />• Fixed gases (methane, carbon dioxide, and oxygen) were measured and recorded in <br />volumetric percent at each monitoring probe. <br />• Following field measurements, gas sampling was performed, if necessary, using <br />clean, laboratory -prepared summa canisters. <br />• For purging, the gas -sampling pump was attached with Teflon° tubing to a sample <br />port located at the top of the monitoring probe. After purging at least one casing <br />volume and fixed gases are recorded, a summa canister was attached to the Teflon° <br />tubing to the sample port and a sample was collected by releasing the vacuum on the <br />summa canister. <br />• Chain -of -Custody procedures described above for groundwater samples were also <br />adhered to for both the soil -pore gas and landfill gas samples, and the analytical <br />,k3 <br />Geo -Logic Associates <br />