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Summary of Hg Data Collected in Guadalupe River Watershed: Proposed Model Development

Summary of mercury (Hg) data collected in the Guadalupe River Watershed and proposed model development for load calculations. Includes information on study design, sampling methods, Hg concentrations, and future improvements.

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Summary of Hg Data Collected in Guadalupe River Watershed: Proposed Model Development

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  1. San Francisco Estuary Institute Item #5 Summary of Hg Data Collected in Guadalupe River Watershed:Proposed Model Development Lester McKee and John Oram Sources Pathways and Loadings Workgroup November 13th 2006

  2. San Francisco Estuary Institute Item #5 History 2000 – 2002: Study design and location developed and recommended by the Sources Pathways and Loadings Workgroup (SPLWG) of the Regional Monitoring Program for Trace Substances (RMP) WY 2003: CEP ($150k) WY 2004: RMP and CEP ($50k+75k) WY 2005: RMP, USACE/SCVWD, SCVURPPP ($50k + $100k + $23k) WY 2006: RMP, USACE/SCVWD ($50k + $78k) RWQCB provided $10k to analyze samples from storm drains and upper watershed tributaries

  3. San Francisco Estuary Institute Item #5 MethodsStorm drains – San Pedro Grab samples using DH 48 (SSC) and DH 81 (mercury) depth integrating samplers

  4. San Francisco Estuary Institute Item #5 MethodsStorm drains – San Pedro

  5. San Francisco Estuary Institute Item #5 MethodsStorm drains – San Pedro

  6. San Francisco Estuary Institute Item #5 MethodsStorm drains – San Pedro

  7. San Francisco Estuary Institute Item #5 Methods Tributaries • Grab samples from middle or side of channel aiming for mid depth Alamitos Ck. at Graystone Lane April 4th 2006

  8. San Francisco Estuary Institute Item #5 Methods Tributaries McAbee Ck at Stone Bridge April 4th 2006

  9. San Francisco Estuary Institute Item #5 Methods Tributaries Jacques Gulch April 4th 2006

  10. San Francisco Estuary Institute Item #5 Results

  11. San Francisco Estuary Institute Item #5 Hg Concentrations in the Guadalupe River Watershed(Incl. data from SFEI, TetraTech and County Parks)

  12. San Francisco Estuary Institute Item #5 Loads Calculation Method for Guadalupe R. at Hwy 101 (WY 2003-06 • Classify as either upper, lower or base based on rainfall distribution, flow and SSC at the gage, and known travel times (6-7 hours from the top), 4 hours from either Guadalupe or Almaden reservoir, 3 hours from the SCVWD office, 15-30 minutes from downtown San Jose. • Use real data when it is collected and extrapolate the particulate concentration from our real data for a long as justifiable. • Fill in the gaps using regression estimators (starting with upper and lower) • Fill in the base flow gaps. If base flow follows upper water then use upper regression. If base flow follows lower water then use lower regression.

  13. San Francisco Estuary Institute Item #5 Current method is binary! Flow from upper watershed 2 mg/kg [Hg] 0.9 mg/kg Flow from lower watershed SSC

  14. San Francisco Estuary Institute Item #5 Improving the Loads Calculation Method:The Future is Modeling • But the reality is that our sampling location receives water from a complex mix of water from a variety of sources and this mix varies constantly with time at scales of minutes to hours

  15. San Francisco Estuary Institute Item #5 Conceptual model for a Model

  16. San Francisco Estuary Institute Item #5 Conceptual model for a Model - Equation QHwy101xCHwy101 = QCxCC + QCCxCCC + QACxCAC + QMCxCMC + QGCxCGC + QRCxCRC + QUrbxCUrb Where: C =Canoas Ck. CC =Calero Ck. AC =Alamitos Ck. MC = McAbee Ck. GC = Guadalupe Ck. RC = Ross Ck. Urb = Urban outfalls

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