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Table 3 <br /> Maintenance Schedule for Field Equipment <br /> Quality Assurance Project Plan <br /> Stockton 99 Speedway <br /> Stockton, California <br /> inspect Probes, Charge or <br /> Instrument Calibrate Clean <br /> Cables, Meters Battery Check <br /> YSI 556 Water Quality Meter M D M M <br /> Thermo 580. EZ Photo Ionization Detector ti <br /> M D M M <br /> (PID) <br /> LEL Meter M D M M <br /> Depth to Water Sounder M NA M M <br /> Notes: <br /> M = Monthly or before each use <br /> D = Twice a day (before and after data collection) ' <br /> LEL = Lower Explosive Level <br /> Page 1 of 1 The Source Group,Inc, <br />