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. Horizon- ),eld Methods and Procedures <br /> After the water levels within the wells stabilize, a sample will be collected with a clean disposable <br /> e bailer. Samples will be contained in air-tight vials and then packed on ice and sent to the laboratory <br /> for analysis. Groundwater samples will be transported to the laboratory and analyzed within the <br /> EPA-specified holding time for requested analysis. <br /> Each sample container submitted for analysis will have a label affixed to identify the job number, <br /> sample date, time of sample collection, and a sample number unique to that sample. Samples will <br /> be analyzed by a California-certified laboratory <br /> A Chain-of-Custody form will be used:to record possession of the sample from time of collection to <br /> its arrival at the laboratory. When the samples will be shipped, the person in custody of them <br /> relinquishes the samples by signing the Chain-of-Custody form and noting the time. The Sample <br /> Control Officer at the laboratory will verify sample integrity and confirm that the sample was <br /> collected in the proper container, preserved correctly, and that there is an adequate volume for <br /> analysis. <br /> 8.0 WELLHEAD TOP OF CASING MEASUREMENT <br /> The top of each new well riser will be measured to allow correlation of the groundwater levels at the <br /> site. The measured point on each well riser will be marked to help insure future groundwater level <br /> measurements are taken from the same location. All measurements will be measured relative to an <br /> arbitrary datum or benchmark to the nearest 0.01-foot using a surveyor level,and graduated stadia <br /> rod. If using an arbitrary datum, one-well riser will be assigned the arbitrary datum.and the other <br /> well riser will be measured higher or,lower relative to the arbitrary datum. <br /> HORIZON ENVIRONMENTAL INC. <br />