U.S. Geological Survey Open-File Report 03-331
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Storm runoff water-quality samples were collected as part of the State of Hawaii Department of Transportation Stormwater Monitoring Program. This program is designed to assess the effects of highway runoff and urban runoff on Halawa Stream. For this program, rainfall data was collected at two sites, continuous streamflow data at three sites, and water-quality data at five sites, which include the three streamflow sites. This report summarizes rainfall, streamflow, and water-quality data collected between July 1, 2002 to June 30, 2003.
A total of 28 samples were collected over five storms during July 1, 2002 to June 30, 2003. For two of the five storms, five grab samples and three flow-weighted timecomposite samples were collected. Grab samples were collected nearly simultaneously at all five sites, and flow-weighted timecomposite samples were collected at the three sites equipped with automatic samplers. The other three storms were partially sampled, where only flow-weighted time-composite samples were collected and/or not all stations were sampled. Samples were analyzed for total suspended solids, total dissolved solids, nutrients, chemical oxygen demand, and selected trace metals (cadmium, copper, lead, and zinc). Grab samples were additionally analyzed for oil and grease, total petroleum hydrocarbons, fecal coliform, and biological oxygen demand. Quality-assurance/qualitycontrol samples, collected during storms and during routine maintenance, were also collected to verify analytical procedures and insure proper cleaning of equipment.
Abstract
Introduction
Data-Collection Network
Water-Quality Sampling Techniques
Rainfall and Streamflow Data
Stormwater Sampling: Conditions And Results
Third Quarter 2002 – July 1 to September 30, 2002
Fourth Quarter 2002 – October 1 to December 31, 2002
Storm of October 14–15, 2002
First Quarter 2003 – January 1 to March 31, 2003
Storm of January 15, 2003
Storm of January 30–31, 2003
Storm of February 14, 2003
Storm of March 16–17, 2003
Second Quarter 2003 – April 1, 2003 to June 30, 2003
Quality Assurance
References Cited
Appendix A: Discharge Reporting And Load Calculation Methods
Appendix B: Physical Properties, Concentrations, And Loads For All Samples Collected From Halawa Stream Drainage Basin During The Period From July 1, 2002 To June 30, 2003, Oahu, Hawaii—xls file (66 KB)
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