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Download PDF File Bull Run Interim Measures Watershed Report Amanda Fritz, Commissioner Gabriel Solmer, Director 1120 SW Fifth Avenue, Suite 405 Portland, Oregon 97204-1926 503-823-7404 portlandoregon.gov/water December 18, 2020 Carrie Gentry Oregon Health Authority Drinking Water Services PO Box 14450 Portland, OR 97293-0450 Subject: Bull Run LT2 Interim Measures Watershed Report for Water Year 2020 Dear Carrie: As required by the Bilateral Compliance Agreement, Section IV.A.4 (Oregon Health Authority; December 18, 2017), PWB conducted field inspections and environmental monitoring in Water Year 2020 in accordance with its Bull Run LT2 Interim Measures Watershed Inspection and Monitoring Plan (Portland Water Bureau 2018). The Bilateral Compliance Agreement requires all inspection and monitoring results to be reported to OHA on an annual basis in a Bull Run LT2 Interim Measures Watershed Report. This Bull Run LT2 Interim Measures Watershed Report is being submitted to OHA to fulfill PWB’s reporting requirements for Water Year 2020. For Water Year 2020, PWB met all field inspection and environmental monitoring requirements. Results of field inspections and environmental monitoring did not indicate any significant changes in the watershed conditions or concerns of Cryptosporidium contamination. Please note that the Annual Watershed Control Program Report for Water Year 2020, required for PWB’s filtration exemption, has been submitted separately. If you have any questions about the enclosed report, please feel free to contact me at (503) 823-7648. Sincerely, Yone Akagi, P.E. Water Quality Manager Enclosure Cc: Ann Levy, Chris Wanner Please contact us for translation or interpretation, or for accommodations for people with disabilities. More information · Más información · Thêm thông tin · 欲了解更多信 · Дополнительная информация Mai multe informații · Подробиці · Macluumaad dheeri ah · अ�धक सचनाू · Tichikin Poraus portlandoregon.gov/water/access · 503-823-7432 (TTY: 503-823-6868, Relay: 711) Bull Run LT2 Interim Measures Watershed Report Water Year 2020 Portland Water Bureau Submitted to the Oregon Health Authority December 18, 2020 Portland Water Bureau Interim Measures Watershed Report for Water Year 2020 Contents Executive Summary .............................................................................................................. 1 1. Introduction .................................................................................................................. 3 1.1 Background ........................................................................................................ 3 1.2 Report Objectives and Organization .................................................................... 4 2. Watershed Security Inspections .................................................................................... 6 2.1 Objectives and Requirements ............................................................................. 6 2.2 Gate Inspections and Security Investigations ...................................................... 6 2.3 Trail Inspections ................................................................................................. 7 3. Diversion Pool Inspections .......................................................................................... 10 3.1 Objectives and Requirements ........................................................................... 10 3.2 Routine Inspections.......................................................................................... 10 3.3 Comprehensive Inspections.............................................................................. 11 3.4 Wildlife-specific Inspections.............................................................................. 11 4. Soil Erosion Area Inspections ...................................................................................... 12 4.1 Objectives and Requirements ........................................................................... 12 4.2 Ground Inspection ............................................................................................ 12 5. Sanitary Facility Inspections ........................................................................................ 15 5.1 Objectives and Requirements ........................................................................... 15 5.2 Facility Condition Inspections ........................................................................... 15 5.3 Waste Transport Inspections ............................................................................ 19 6. Tributary and Other Upstream Water Monitoring ......................................................... 20 6.1 Objectives and Requirements ........................................................................... 20 6.2 Methodology..................................................................................................... 20 6.3 Results ............................................................................................................. 21 7. Wildlife Scat Monitoring .............................................................................................. 28 7.1 Objectives and Requirements ........................................................................... 28 7.2 Methodology..................................................................................................... 28 7.3 Results ............................................................................................................. 31 8. Works Cited ................................................................................................................ 39 Appendixes ......................................................................................................................... 42 A. Cryptosporidium and Giardia Analytical Results for Tributary Samples B. Cryptosporidium and Giardia Analytical Results for Reservoir Samples C. Cryptosporidium Analytical Results for Wildlife Scat Samples Contents i Portland Water Bureau Interim Measures Watershed Report for Water Year 2020 Tables Table 1: Report Organization and Compliance with the Interim Measures Watershed Plan ... 4 Table 2: Findings and Recommendations from the Water Year 2019 Pacific Crest Trail Inspections ........................................................................................................................... 7 Table 3: Water Year 2020 Erosion Inspection ..................................................................... 12 Table 4: Water Year 2020 Sanitary Facility Condition Inspections ....................................... 16 Table 5: Portable Sanitary Facilities Requiring Secondary Containment .............................. 17 Table 6: Water Year 2020 Waste Transport Inspections...................................................... 19 Table 7: Key Station, Reservoir and Minor Tributary Monitoring Sites .................................. 20 Table 8: Stream Discharge Event Sampling Triggers ........................................................... 21 Table 9: Water Year 2020 Cryptosporidium and Giardia Results at Tributary and Reservoir Monitoring Sites ................................................................................................................. 22 Table 10: Water Year 2020 Method 1623.1 Matrix Spike Recoveries in Tributaries and Reservoir 1 ......................................................................................................................... 27 Table 11: Multiplex vs Singleplex PCR Genotyping Results on Wildlife Scat ........................ 29 Table 12: Cryptosporidium Prevalence by PCR in Water Year 2020 Wildlife Scat Samples .. 32 Table 13: Water Year 2020 Wildlife Scat Genotyping Results.............................................. 35 Table 14: Information about Species and Genotypes of Cryptosporidium Found in Scat Samples in the Bull Run Watershed in Water Year 2020..................................................... 36 Table 15: PCR Matrix Spike Recoveries for Water Years 2017- 2020 .................................. 38 Figures Figure 1: Watershed Inspection and Monitoring Sites: Diversion Pool, Key Stations, Sanitary Facilities, South Fork Landslide, and Reservoir 1. ................................................................. 5 Figure 2: Pacific Crest Trail Security Inspections ................................................................... 8 Figure 3: Oneonta Trail Security Inspection ........................................................................... 9 Figure 4: Diversion Pool Inspection Area ............................................................................. 10 Figure 5: South Fork landslide photos from three vantage points. Photos from past ground surveys on left, from Water Year 2020 survey on right. ....................................................... 14 Figure 6: Sanitary Facility Inspection Locations ................................................................... 18 Figure 7: Key Station 15, North Fork Bull Run River Discharge and Sample Collection ........ 23 Figure 8: Key Station 18, Main Stem Bull Run River Discharge and Sample Collection ........ 24 Figure 9: Key Station 35, South Fork Bull Run River Discharge and Sample Collection ........ 25 Figure 10: Key Station 44, Fir Creek Discharge and Sample Collection ............................... 26 Figure 11: Map of Scat Sample Collection Locations ........................................................... 33 Figure 12: Map of Cryptosporidium-Positive Scat Locations ................................................ 34 Contents ii Portland
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