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Horizon!Horlzon!s Field Methods and Procedures <br />After the water levels within the wells stabilize, a sample will be collected with a clean disposable <br />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 Califomia-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 />• • • <br />