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• <br />SYSTEM CALIBRATION AND MAINTENANCE <br />The sensor and data logger will require maintenance and calibration approximately <br />once per year throughout the life of the system to insure quality data. The in-place <br />equipment will be removed and manual readings will be taken with the standard probe. <br />As a minimum, the components will be visually checked and cleaned and the battery will <br />be replaced. Damaged or defective parts will be replaced or repaired. Electrical <br />continuity of the connecting cables may also be checked at that time. This work will be <br />performed by a qualified, trained professional. <br />0 Respectfully submitted, <br />Yeh and Associates, Inc. <br />Pihl <br />Roger A. Pihl P.G., (WY #PG-3353) <br />Principal Scientist <br />0