Las Vegas Wash Tributaries Water Quality Report, 2003-2007

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Where possible, samples were collected in the middle of the main channel with a pre-cleaned,large-mouth, four-liter plastic container. The large container allowed the sampling crew tocollect a sufficient quantity of water for the numerous analyses conducted at each site. Thislarge sample was then transferred into the individual sample bottles for each analyses group.The original sample was shaken before each aliquot was dispensed which provided for ahomogenous sample and prevented particle matter from settling.The sample container was rinsed three times with sample water before final sample collection.All samples were labeled specifying site and location, analysis requested, and date and timesampled. Sample bottles for organic pollutants, metals and cations-anions were prepared anddelivered for use in the field by Montgomery Watson Laboratories (MWL) in Pasadena,California (2003-2005) and by Weck Laboratories (Weck) in Monrovia, California (2006-present). Sample bottles for perchlorate, and bacteria were prepared and pre-labeled by theSNWS Laboratory Support Services personnel. Labels for perchlorate and bacteria weregenerated by the SNWS LIMS database. If needed, preservatives were added by MWL, Weck orby SNWS. Sample bottles and labels for nutrient analysis were provided by Clark County WaterReclamation District (Jan. – Apr. 2003), Nevada Environmental Laboratories (Apr. 2003-2005),and by Weck (2006-present). After collection, all samples except bacteria were maintained in acooler of ice to 4 o C. Bacteria samples were kept in a separate cooler of freezer packs to preventthe contamination by ice water. Samples were shipped immediately after the sampling event todesignated laboratories for analysis. All samples were accompanied by chain of custody record.3.0 RESULTS AND DISCUSSION3.1 Water Quality in Tributaries and Seeps to the Las Vegas Wash3.1.1 Field MeasurementsQuarterly sampling information, field measurements (EC, pH, temperature, and DO), andturbidity results are presented in Appendix B. Annual average field measurements werecalculated and are compiled in Table 3 and graphically presented in Figures 2a-e.2003Site Temp. 0 C pH EC uS/cm DO mg/L Turbidity NTULVC_2 17.4 8.18 2059 8.81 1.47LW12.1 18.2 8.34 3598 10.61 4.68FW_0 17.6 8.13 3658 7.84 1.59SC_1 18.0 8.70 2390 9.04 1.54MC_2 19.4 8.20 4040 7.77 1.71DC_1 13.6 7.96 5673 9.66 6.76LWC6.3 19.7 7.43 7750 6.84 0.22LWC3.7 22.1 7.43 2955 3.25 5.47Tributary Water Quality Monitoring Program, 2003-2007 5
2004Site Temp. 0 C pH EC uS/cm DO mg/L Turbidity NTULVC_2 16.1 8.09 2251 10.34 1.61LW12.1 15.0 8.24 3868 8.64 2.32FW_0 18.0 8.25 3630 9.31 3.81SC_1 19.3 9.08 2493 11.05 1.63MC_2 15.5 8.08 5020 8.28 0.77DC_1 20.9 7.98 6440 6.97 5.99LWC6.3 21.8 6.95 7890 4.88 5.83LWC3.7 21.9 7.33 3113 1.91 15.83*2005Site Temp. 0 C pH EC uS/cm DO mg/L Turbidity NTULVC_2 19.2 8.20 1899 8.45 20.53LW12.1 17.8 8.10 3023 8.53 68.83FW_0 17.0 8.15 2906 7.82 31.31SC_1 17.2 8.29 2286 7.95 4.75MC_2 18.1 8.09 4930 7.73 5.04DC_1 19.3 8.22 5797 9.72 6.54LWC6.3 22.2 6.94 7755 5.83 19.852006Site Temp. 0 C pH EC uS/cm DO mg/L Turbidity NTULVC_2 18.6 8.46 1818 8.46 5.15LW12.1 16.4 8.32 3588 9.85 2.50FW_0 18.0 8.25 3557 9.31 3.81SC_1 20.4 9.00 2796 12.08 2.36MC_2 18.9 8.27 5028 11.04 4.20DC_1 18.5 8.15 5738 9.75 5.89LWC6.3 21.6 6.32 9610 5.52 27.20BS_1 20.6 8.44 5667 10.55 0.822007Site Temp. 0 C pH EC uS/cm DO mg/L Turbidity NTULVC_2 11.6 8.36 2003 11.35 1.63LW12.1 16.6 8.24 3730 10.90 3.18FW_0 16.2 8.21 3454 10.57 1.38SC_1 13.6 8.52 3348 11.97 0.93MC_2 19.1 8.27 4854 14.97 0.93DC_1 23.6 7.83 5433 10.56 0.67BS_1 23.6 8.27 5070 9.57 0.57Table 3. Annual average field measurements.*Data point excluded for averaging purposes.Tributary Water Quality Monitoring Program, 2003-2007 6
Page 2 and 3: Tributary Water Quality Monitoring
Page 4: List of TablesPage No.Table 1. Samp
Page 7 and 8: Site NameLVC_2LW12.1FW_0SC_1DC_1MC_
Page 9: 2.2 ParametersField measurements, i
Page 13 and 14: 2c: Average Field Parameters, 20058
Page 15 and 16: SiteYearCalcium (mg/l)Magnesium(mg/
Page 17 and 18: 600050004000TDS in mg/L300020001000
Page 19 and 20: TOC concentrations were less than 6
Page 21 and 22: 0.30OPTP0.25Average Concentration m
Page 23 and 24: 900.0800.0Aluminum (ug/l)Manganese
Page 25 and 26: 25.020.0Selenium (ug/l)15.010.05.00
Page 27 and 28: Average of the Average Bacteria Con
Page 29 and 30: Annual Average Perchlorate Concentr
Page 31 and 32: SampleSitePeriodSampleGlyoxalM-Glyo
Page 33 and 34: methods for measurement and computa
Page 35 and 36: 80007000All tributaries contribute
Page 37 and 38: 4.0 CONCLUSIONSThe Tributary Water
Page 39 and 40: Appendix AIndividual Parameters to
Page 41 and 42: 2,4-Dimethylphenol 5.00 Atrazine (A
Page 43 and 44: Ib. Heavy Metals GroupAluminumAntim
Page 45 and 46: Appendix IIa. Quarterly Field Measu
Page 47 and 48: Appendix IIa. Quarterly Field Measu
Page 49 and 50: Appendix IIb. Quarterly Major Ion C
Page 51 and 52: Appendix IIb. Quarterly Major Ion C
Page 53 and 54: Appendix IIc. Nutrient Concentratio
Page 55 and 56: Appendix IId. Quarterly Heavy Metal
Page 57 and 58: Site LocationAppendix IId. Quarterl
Page 59 and 60: Appendix IIe. Organic Compound Conc
Page 61 and 62:
Appendix IIe. Organic Compound Conc
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73:
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Las Vegas Wash Tributaries Water Quality Report, 2003-2007

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