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Redwood City <br /> Water Quality Monitoring Program Plan <br /> <br /> <br />© 2014 DKF Solutions Group, LLC Page 18 of 41 <br />B. Calibration and Record Keeping <br />Each piece of equipment is required to have an up-to-date calibration and maintenance <br />logbook. The logbook will be maintained to have consecutively numbered pages and shall <br />contain at least the following: <br /> Date <br /> Calibration Results <br /> Calibration comments <br /> Initials of the individual calibrating the instrument <br /> <br />Each instrument must be clearly identified (e. g., the make, model, serial and/or ID number) to <br />differentiate among multiple meters. <br /> <br />The appropriate calibration procedure must be followed pursuant to City standard calibration <br />operating procedure and if the instrumentation does not have an electronic program that <br />maintains a running calibration log, then the results must be recorded in the logbook each time <br />a piece of field equipment is used, along with the date and name/initials of the person <br />performing the calibration. <br /> <br />If difficulty is encountered in calibrating an instrument, or if the instrument will not hold <br />calibration, this information must also be recorded. Malfunctioning equipment should not be <br />used to collect data. Steps should be taken to correct the problem as soon as possible. All <br />equipment maintenance should be recorded in the logbook indicating what was done to <br />correct the problem, along with the date and signature/initials of the staff person that corrected <br />the problem. <br /> <br /> <br />9. Sampling Procedures <br />A. Sample Location and Identification Procedures: <br />Samples will be collected by the City of Redwood City’s Utilities Specialist or designated <br />agent. The most precise and accurate analytical measurements are worthless and even <br />detrimental if performed on a sample that was improperly collected and stored, or was <br />contaminated in the process. The purpose of sampling and analysis is to provide data that <br />can be used to interpret the quality or condition of the water under investigation. <br /> <br />Unfortunately, water quality characteristics are not spatially or temporally uniform from one <br />effluent to another. A sampling program must recognize such variations and provide a basis <br />for compensations for their effects. The sample must be: <br />1. Representative of the material being examined; <br />2. Uncontaminated by the sampling technique or container; <br />3. Of adequate size for all laboratory examinations; <br />4. Properly and completely identified; <br />5. Properly preserved, and <br />6. Delivered and analyzed within established holding times. <br /> <br />These six requirements are absolutely necessary for a proper assessment of water quality. <br /> <br />It is impossible to establish hard and fast rules concerning sampling locations. However, the <br />following general guidelines should be applied whenever City of Redwood City personnel <br />6.2.A. - Page 184