ARCHIVED REPORTS_2007 - Laserfiche WebLink

Home Browse Search

• Collected samples, accompanied by a trip blank,were placed immediately in an ice-filled cooler for transport to a state-certified testing laboratory. Samples were kept chilled(at about 4°C)until delivery. • A completed Chain-of-Custody form, detailing the sample I.D.numbers,date and time collected, analyses requested, and other project information, accompanied each sample to the laboratory. The Chain-of-Custody forms were signed and dated by all personnel retaining custody of the samples (Appendix Q. Surface-Water Sampling The sampling protocols listed below were generally followed during surface water sampling operations. • Surface-water sampling was performed by submerging laboratory-supplied sample containers, or a decontaminated dipper,in a slow moving portion of the surface water channel at the designated sampling station. • Sample preservation, order of collection, and Chain-of-Custody procedures described above for groundwater sampling were also adhered to for surface water sample collection. Soil-Pore Gas Sampling Soil-pore probes at the French Camp Landfill were sampled as follows: • Field measurements were completed using a Landtec GEM 2000 (or equivalent)that was calibrated daily with methane, carbon dioxide, and oxygen. • Each soil-pore gas probe was purged of at least one casing volume prior to recording the measured gas concentrations. • Methane, carbon dioxide, and oxygen were measured and recorded in volumetric percent at each monitoring probe. • Following field measurements, gas extraction was performed using a stainless steel gas- sampling pump. • Clean, new laboratory-prepared 10-liter Tedlar®sample bags, fitted with aluminum or stainless steel tube fittings for sampling,were placed into light-sealed receptacles (to prevent photochemical reactions)during transport. 3 WK-SApinnwOU" Geologic Associates