From turtle2@u.washington.edu Tue Nov 18 15:23:35 1997 Received: from jason03.u.washington.edu (root@jason03.u.washington.edu [140.142.77.10]) by lists.u.washington.edu (8.8.4+UW97.07/8.8.4+UW97.05) with ESMTP id PAA23424 for ; Tue, 18 Nov 1997 15:23:33 -0800 Received: from homer20.u.washington.edu (turtle2@homer20.u.washington.edu [140.142.76.4]) by jason03.u.washington.edu (8.8.4+UW97.07/8.8.4+UW97.05) with ESMTP id PAA27904 for ; Tue, 18 Nov 1997 15:23:32 -0800 Received: from localhost (turtle2@localhost) by homer20.u.washington.edu (8.8.4+UW97.07/8.8.4+UW97.04) with SMTP id PAA119282 for ; Tue, 18 Nov 1997 15:23:31 -0800 Date: Tue, 18 Nov 1997 15:23:31 -0800 (PST) From: Lorna Fitzpatrick Reply-To: Lorna Fitzpatrick To: "C.E. Graduate Students" Subject: MSCE Defense - Sherri L. Peterson Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Date: Tue, 18 Nov 1997 14:09:46 -0800 (PST) From: Marcia Buck To: Undisclosed recipients: ; Subject: MSCE Defense - Sherri L. Peterson The final examination for the MSCE degree for Sherri L. Peterson will be held on Wednesday, November 26, 1997, 3:00-4:30 pm in More 225. STORMWATER SAMPLING METHODS FOR LOW FLOW STREAMS AND TIDALLY INFLUENCED STORM DRAINS This thesis describes the design, development and testing of a stormwater sampling device (Instream Needle Composite Sampler) for use in low flow streams. This device provides a low cost alternative to current practices. The Instream Needle Composite Sampler collects a continuous composite sample for evaluating the effectiveness of Best Management Practices (BMPs). The sample is easily transferred to a laboratory bottle for analysis to determine whether BMPs are providing adequate protection to nearby waters. Performance of the sampler was evaluated in a laboratory flume and in several small streams crossed by a road construction project in Bellevue, Washington. Samples collected in the streams were compared to grab samples taken during the same storm events. Total Suspended Sediment (TSS) and Total Phosphorus (TP) concentrations from the composite samples were within a factor of two of the grab samples. The sampler aids monitoring efforts by reducing the number of missed sampling events. Also described are the difficulties associated with collecting stormwater samples from a storm drain that is regularly inundated by tide water. The presence of an improperly working tide valve at the study site further complicates sampling efforts. A sampling method for this situation is evaluated that would allow for more frequent sampling opportunities by eliminating the restriction of sampling during low tide windows. Dr. Brian W. Mar, Chairman Dr. Timothy V. Larson Dr. Robert Chandler Room Confirmation #24964 .