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<br />Dissolved Metals (Total): X X <br />Calcium, Cadmium, Copper, <br />Iron, Manganese, Arsenic, <br />Nickel, Lead, Zinc <br />Volatiles TE X X <br />Semivolatiles X <br />'Metals list based on Lower Colorado River Segment 2 Standards. <br />Samples will be tested in the field for pH, specific conductivity, temperature, and dissolved <br />oxygen content. Initially, five water samples will be submitted to a lab for Total Dissolved <br />Solids (TDS) analysis. Using the information obtained from these analyses, the conversion <br />factor between conductivity and TDS will be estimated, such that TDS will be given by: <br />(Conductivity) x (Conversion Factor) =Total Dissolved Solids. <br />Typically, the conversoin factor ranges from .59 to .7, with .65 being the accepted value. <br />With the analytical results from the five samples, this factor can be more accurately estimated. <br />This conversion formula will allow TDS to be approximated and recorded on a weekly, <br />monthly, and quarterly basis, without additional analytical expenditures. These data will be <br />recorded on a Liquid Substance Sampling Form (ISSF) at the time of sampling. Samples will <br />be collected and processed following procedures described in Appendix A, Sample Handling <br />and Documentation. The required containers, preservatives, holding times, and analytical <br />method for specific analysis are also provided in Appendix A. <br />Quality control samples will be collected in conjunction with the investigative samples to <br />provide information on data quality. Field de-ionized water blanks and sample duplicates will <br />be collected in the field at a 5 percent frequency (1 in 20 samples) and submitted for analysis. <br />Field quality control samples will be submitted with a fictitious identification (blind) to ensure <br />the laboratory cannot recognize the sample type. <br />17 <br />