. Bulletin. Wissenschaft. DIAZINON IN DEN CHOLLAS Nebenfluss-wasserscheide 35 Legende...: er Qualität Probe station.^ Sedimentqualität probe Station Wohn- und Büro ff $ Industrielle Transport Puolc F*O*t> es und Utilities Parks und Erholung Agncuiture unentwickelten Wasser I. bi> Jahr == die Abb. 64. 1. Sampling Sites auf Chollas Creek, und die damit verbundenen Landnutzung der Chollas Nebenfluss-wasserscheide. Hinweis. * DPR (2), Prism1 PRISM2, SD8 (1) CC-N1-N2, CC, CC-S1, CC-S2 waren Sampling Sites von Weston Solutions, Inc., 2006. 0,1 Zoll in Wasser Jahr), Sturm bei Niederschlag, Intensität (die Menge der gefälltes

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. Bulletin. Science. DIAZINON IN THE CHOLLAS CREEK WATERSHED 35 Legend ...:er quality sample station .â ^ Sediment quality sample station Residential Commercial and Office ff$ Industrial Transportation Puolc F*o*t>es and Utilities Parks and Recreation Agncuiture Undeveloped Water I. bi>yr==a Fig. 1. Sampling sites on Chollas Creek, and associated land use of the Chollas Creek watershed. Note. *DPR(2), PRISM1, PRISM2, SD8(1) CC-N1, CC-N2, CC-S1, CC-S2 were sampling sites from Weston Solutions, Inc., 2006. 0.1 inch in water year), storm event precipitation, intensity (the amount of precipitation in centimeters per hour during storm event), and annual cumulative precipitation. Annual cumulative precipitation was calculated based on a water year, from October to September of the following year. Flow measurements for Chollas Creek during this study were not available. A Mann-Whitney U test (Mann and Whitney 1947) was performed to compare diazinon levels before the pesticide's phase-out period (1998-2004) to levels after the phase-out was completed (2005), and a Kendall's test (Kendall 1955) was performed to determine if the declining trend in levels of diazinon from 1998 through 2005, has been significant. Quality Assurance (QA) and Quality Control (QC) Procedures Quality control samples consisted of field blanks, field duplicate samples, and lab duplicate samples. Precision for all samples were within the objective for diazinon of 25% which was previously established (San Diego Baykeeper 2005), except for a single sample (Site 4 on March 29, 2006) which showed precision of 26%. Overall precision was 4.96% for all tests. Additionally, QA/QC procedures consisted of enrichment of natural Chollas Creek waters at each sampling site, with at least two different levels (100 ppt and 200 ppt or 500 ppt) of diazinon spiked into these samples, in order to determine the accuracy of the ELISA method. Accuracy of the ELISA test for diazinon-spiked samples for each rain event r

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