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TABLE 2 <br />Summary of Surface Water Monitoring Sites <br />for the Nucla Mine <br />Cessation <br />Site Name Monitoring Frequency <br />(Computer No.) Drainage Type of Flow Measurement and Remarks Flow Quality <br />1 1 <br />SW-N1 Upper Tuttle Draw Flow = cross section x velocity* Semiannual Semiannual <br />(SA0001) <br />1 1 <br />SW -N3 Lower Tuttle Draw Flow = cross section x velocity* Semiannual Semiannual <br />(SA0003) <br />SW -N5 Mid -Lower West Same site as NPDES 001(DA0001) 2 2 <br />(SA0005) Return Ditch <br />1 1 <br />SW -N7 Upper West Return Flow height measured in CMP; flow determined using Manning's Semiannual Semiannual <br />(SA0007) Ditch equation (low flow measured with bucket and stop watch) <br />NPDES 001 Mid -Lower West Continuous recorder with sharp-crested 90° V -notch weir 2 2 <br />(DA0001) Return Ditch <br />NPDES 002 Tributary to Type of flow measurement not determined; no discharge 2 2 <br />(DA0002) Tuttle Draw observed since 1980 <br />NPDES 003 Tributary to Type of flow measurement not determined; no discharge 2 2 <br />(DA0003) Tuttle Draw observed since 1980 <br />