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• r <br /> KLEINFELDER <br /> 6. After the sample is collected, the lysimeter vacuum is reset to the manufacturer's <br /> recommended value. The lysimeter is also tested to evaluate potential leaks that may <br /> cause vacuum pressure loss. <br /> A-6 LEACHATE MONITORING <br /> 1. The leachate riser or wells are first opened and allowed to equilibrate with the <br /> atmosphere. <br /> 2. The leachate elevation is then measured from a set location using a conductivity-based <br /> water-level meter. The level is generally measured from a surveyed mark on the north <br /> rim of the casing. <br /> 3. A leachate sample is then collected using a clean, disposable bailer. <br /> 4. The sample is labeled and immediately stored in an iced cooler pending transport to the <br /> analytical laboratory. The sample is logged on a chain-of-custody. <br /> A-7 SURFACE WATER MONITORING <br /> 1. Prior to collecting surface water samples, the depth of water is estimated at a designated <br /> location in the surface water body. <br /> 2. Surface water samples are collected directly from the stream or surface water using a <br /> clean unpreserved plastic bottle, disposable bailer, bailer, coliwasa, DipstikTM, dipper, <br /> peristaltic pump, etc., or by directly filling the sample containers. Sampling equipment <br /> will either be disposable, dedicated or decontaminated in accordance with the above- <br /> defined decontamination protocols. Care is taken not to disturb the stream bottom and <br /> introduce sediment in the sample. The fluid is then poured into appropriate preserved or <br /> unpreserved bottles for the requested analysis. <br /> 3. The sample is labeled and immediately stored in an iced cooler pending transport to the <br /> analytical laboratory. The sample is logged on a chain-of-custody. <br /> A-8 TANK REMOVAL SAMPLING <br /> A-8.1 Collection of Soil Samples and Laboratory Analysis <br /> Soil and water samples will be collected during the tank removal operations in accordance with <br /> the current Leaking Underground Fuel Tank Field (LUFT) Manual and the Tri-Regional <br /> Guidelines issued by the California Regional Water Quality Control Board (RWQCB). <br /> A Kleinfelder, environmental geologist will be on site during the tank removal activities to <br /> collect soil samples for qualitative field screening and laboratory analysis. Tank excavation soil <br /> samples will be obtained by scraping the sidewalls or excavation bottom at the desired locations <br /> with the backhoe bucket. Samples will then be collected from the bucket by packing soil in a <br /> 50890.E01/ST05R358/JDZ:ly Page A-7 <br /> 0 2005,Kleinfelder,Inc. April 29,2005 <br />