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Wright Environmental Services, Inc. <br /> 3. The soil samples in the lowermost of brass liners in the sampling tool (if used) <br /> will be retained for chemical testing. The samples will be labeled and sealed in the <br /> field in their original liners. Sample liners ends will be sealed with Teflon® paper or <br /> aluminum foil, capped with clean cap plugs, and labeled and logged onto chain of <br /> custody forms. All samples retained for chemical analysis will be stored on ice in a <br /> clean, covered cooler-box/ice chest for transport to the Laboratory (see chain-of <br /> custody below). <br /> Reconnaissance Groundwater Sampling Procedures <br /> This procedure is used when reconnaissance groundwater sampling without <br /> permanent wells is desired. Sampling from open pits or excavations, HydroPunch®, <br /> GeoProbe® or temporarily cased open boreholes may be used. <br /> 1. Reconnaissance groundwater sample handling, and storage will follow <br /> suggested guidance documents of the Environmental Protection Agency and Regional <br /> Water Quality Control Board and local agency guidelines for site investigation. <br /> 2. Reconnaissance groundwater samples will be collected in the field in <br /> temporarily cased exploratory boreholes using clean Teflon® or disposal bailers. The <br /> samples will be collected from excavations or temporarily cased exploratory <br /> boreholes and poured into the properly prepared laboratory containers with <br /> minimum cavitation. All sample containers will be properly sealed with minimum <br /> headspace, labeled, and identified. Label information will include the date, sampler <br /> name, sampling time, and identification number, and the project name and number <br /> and chain-of custody. <br /> If groundwater recharge is slow, sampling will begin within 24 hours following <br /> temporary well development, following the procedures detailed below for monitoring <br /> well sampling. Depth to water measurements will be made to the nearest 0.01 foot to <br /> existing grade (or surveyed datum if possible) for estimates of depth to water in <br /> pits/excavations, and triangulation in temporary boreholes. All <br /> borings/pits/excavations are also checked for presence of separate phase product. <br /> Following water sampling all temporary casing or sampling tools are removed and <br /> boreholes are sealed with cement grout from the bottom to top, or by the regulatory <br /> approved method of sealing. <br /> 2. The sample will be delivered to a State Certified Laboratory. Samples will be <br /> kept on ice and/or refrigerated continuously for shipment to the Laboratory under <br /> chain-of-custody. The sealed sample will only be opened by Laboratory personnel <br /> who will perform the chemical analysis. The samples will be analyzed according to <br /> the approved EPA Method and storage for that requested analysis. <br /> WES Sampling Protocols last rev. 5/96 Page 3 <br />