ARCHIVED REPORTS_XR0011987 - Laserfiche WebLink

Home Browse Search

Appendix B • the top of the well casing. (Every attempt was made to measure depth to water for all wells on the same day.) Total well depth was then measured by lowering the sensor to the bottom of the well. Total well depth, used to calculate purge volumes and to determine whether the well screen was partially obstructed by silt, was recorded to the nearest 0.1 foot on the depth to water/floating product survey form. A Teflon bailer, electric submersible or bladder pump will be the only equipment used for well sampling. When samples for volatile organic analysis are being collected, the Pump flow will be regulated at approximately 100 milliliters per minute to minimize pump effluent turbulence and aeration, Glass bottles of at least 40-milliliters volume and fitted with Teflon-lined septa will be used in sampling for volatile organics. These bottles will be filled completely to prevent air from remaining in the bottle. A positive meniscus forms when the bottle is completely full. A convex Teflon septum will be placed over the positive meniscus to eliminate air. After the bottle is capped, it is inverted and tapped to verify that it contains no air bubbles. The sample containers for other parameters will be filled, filtered as required, and capped. Sample Handling Sample containers were labeled immediately prior to sample collection. Samples were kept cool with cold packs until received by the laboratory. At the time of sampling, each . sample was logged on an ARCO chain-of-custody record that accompanied the sample to the laboratory. Samples that required overnight storage prior to shipping to the Iaboratory were kept cool (4°C) in a refrigerator. The refrigerator was kept in a warehouse, which was locked when not occupied by an Delta employee. A sample/refrigerator log was kept to record the date and time that samples were placed into and removed from the refrigerator. Samples were transferred from Delta to an ARCO-approved laboratory by courier or taken directly to the laboratory by the environmental sampler. Sample shipments from Delta to laboratories performing the selected analyses routinely occurred within 24 hours of sample collection. Sampling and Analysis Chain-of-Custody Record The ARCO chain-of-custody record initiated at the time of sampling contained, at a minimum, the sample designation (including the depth at which the sample was collected), sample type, analytical request, date of sampling, and the name of the sampler. The record sheet was signed, timed, and dated by the sampler when transferring the samples. The number of custodians in the chain of possession was minimized. A copy of the ARCO chain-of-custody record was returned to Delta with the analytical results. i B-2 ,