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<br />' groundwater. Alternately, periodic measurements might be taken before and after <br />' purging the well for comparison. This may allow the conclusion that there is no <br />significant difference. Again, it is most important to maintain consistent sampling <br />methods and provide documentation of the methods used. <br /> Flow measurements for the Cache La Poudre River should also be recorded for the day <br /> that Seld measurements were taken. Flow data is available on the Internet for station# <br /> 06752260 CACHE LA POUDRE RIVER AT FORT COLLINS, CO at the USGS <br />website: http://co.water.usgs.gov/nwis/ <br />Daily estimates tend to be poor for the area <br /> . <br />. <br /> Flow data maybe more accurately determined by comparing the value taken the day of <br />' measurement with the historic data available at the time of analysis. This gage is located <br />100 feet north of the Lincoln Street bridge in Fort Collins <br />CO <br /> , <br />. <br />' A sample data log is included in Appendix B. These logs should be stored in a binder <br />and in a spreadsheet-type computer file <br />clearly marked with each well number <br /> , <br />. <br /> It should always be kept in mind that the readings taken from each well will only be <br /> compared to readings from that well. For this reason it is most important to develop a <br /> method that will consistently measure the water level in one particular well, not <br />' necessarily consistent among all ten measured wells. <br /> Finally, if no measurement is taken, do not record any level on the data log. This will <br />' skew the analysis. Simply note in the comments section that no measurement was taken. <br /> Familiarity with these procedures and methods is critical for the technicians doing the <br /> measurements. Training sessions would be very helpful in clarifying any outstanding <br />' issues and developing a consistent and practical set of methods. Periodically, every 6 <br /> months for example, quality assurance measurements should be taken. This would <br /> require dual measurements taken by another individual at each well location. These <br />' measurements should be kept separate from the general data. This provides an <br /> opportunity to review the measurement techniques and collected data. <br /> <br />1 <br />1 <br /> <br />CJ <br /> <br />t~ <br />