SCVURPPP FY SCBWMI s Watershed Assessment Subgroup (WAS) Meeting September 21, 2004

Transcription

1 SCVURPPP FY Watershed Monitoring and Assessment Summary Report SCBWMI s Watershed Assessment Subgroup (WAS) Meeting September 21, 2004 Paul Randall Senior Scientist Eisenberg, Olivieri, and Associates (EOA) randall@eoainc eoainc.com (510) x 222

2 Multi-Year Monitoring Plan Multi-Year Receiving Waters Monitoring Plan NPDES Permit Provisions C.7(a) and (b) FY through FY Multi-Year Plan Revised in FY Implementation of Revised Plan begins in FY

3 Design and Approach Adapted from RWQCB s SWAMP/RMAS protocols Parameters include: Tier One (Screening/Baseline) General Water Quality (D.O., Cond, Temp, ph) Rapid Bioassessment (CSBP) Physical Habitat Assessment (EPA Visual Assessment) Indicator Organisms Tier Two (Pollutant Specific) Specific pollutants nutrients and anions, total metals (sediment and water), dissolved metals, organophosphate pesticides, SSC, organochlorine pesticides, PCBs, PAHs, and aquatic toxicity (3 species) Measurements collected synoptically

4 Frequency and Timing Rapid Bioassessments Spring Visual Habitat Assessment Spring Water Quality Sampling Data collected once during each basic hydrologic condition: Dry Weather Season (Summer/Early Fall) Wet Weather Season (Winter) Decreasing Hydrograph (Spring) Sediment chemistry Dry Weather Season Aquatic toxicity Dry Weather Season and Spring

5 Watershed Selection Watershed rotation identified in Multi-Year Plan Priorities based on SCVURPPP Integration Report Monitor each watershed once every four years FY 02-03: 03: Coyote, Lower Penitencia Watersheds FY 03-04: 04: San Thomas, Adobe FY 04-05: 05: Calabazas, Matadero/Barron, Sunnyvale (East and West Channels) FY 05-06: 06: Stevens, Permanente San Francisquito and Guadalupe were not included due to existing monitoring efforts

6 Sampling Site/Reach Selection Sites/reaches selected are identified in Annual Plan Annual Monitoring Plan submitted in Program s Work Plan Sampling locations based on: Existing data - watershed characterization Stream classification and geomorphic/hydrologic factors Land use and new development Point source discharges Available habitat (CSBP) Access

7 FY Monitoring Plan Study Areas Adobe Creek Watershed San Tomas Creek Watershed Objective San Tomas Creek Saratoga Creek conduct screening level/baseline monitoring

8 Beneficial Uses Designated Beneficial Uses Saratoga Creek AGR, COLD, FRSH, GRW, REC-1, REC-2, WARM, WILD Existing anadramous fish passage barrier at mouth Potential/Existing Uses not designated: Adobe Creek warm water native fish community documented (WARM)

9 Adobe Creek Watershed Adobe Creek Watershed 10 miles 2 in area Santa Cruz Mountains, Foothills and Santa Clara Valley Alluvial Plain Ecoregion Areas Upper watershed primarily open space MPROSD and Hidden Villa Trust Lower watershed urbanized Primarily high density residential Concrete channel below El Camino Intermittent, unregulated stream flow

10 San Tomas Creek Watershed San Tomas Creek Watershed San Tomas Creek Watershed (not including Saratoga) 28 miles 2 in area 90% watershed is developed; 70% high density residential Predominantly concrete-lined channel Intermittent stream flow Saratoga Creek subwatershed 17 miles 2 in area Upper watershed area open space Lower watershed high density residential Perennial stream flow; water imported and exported

11 Adobe Creek Sampling Locations

12 San Tomas and Saratoga Creek Sampling Locations

13 Bioassessment Sampling Site Locations Bioassessments and Physical Habitat Adobe Creek 4 sampling reaches - A-2 2 (down) to A-5 A 5 (up) No baseline data San Tomas Creek 1 sampling reach - ST-3 3 (unhardened section) No baseline data Channel stability assessment from 2003 HMP Pilot Assessment Saratoga Creek 6 sampling reaches - S-2 2 (down) to S-7 S 7 (up) Baseline data collected by USGS in 1997

14 Description of Adobe Creek bioassessment sampling locations Sampling Station ID Site Elevation (ft) Stream Reach Location Description Predominant Land Use Channel Slope (%) Stream Channel Condition A-2 80 Downstream of footbridge at Terman Park Urban (city park and residential) 1.1 Channelized,, deeply incised A Upstream Edith Ave Bridge Urban (residential) 0.84 Natural with some modification, areas of incision A Foothill College adjacent to stadium Urban (college campus) 1.5 Channelized,, incised A Hidden Villa Farm below confluence of forks Open space 3.1 Natural

15 Description of San Tomas and Saratoga Creek bioassessment sampling locations. Sampling Station ID Site Elevation (ft) Stream Reach Location Description Predominant Land Use Channel Slope (%) Stream Channel Condition ST At Westmont H.S. behind baseball field Urban (school and residential) 0.9 Channelized by earthen levee, deeply incised S Upstream Bollinger Rd Bridge Urban, residential 0.6 Channelized by earthen levee, deeply incised S Downstream Prospect Rd Bridge Urban, residential 0.8 Natural with some modification S Upstream Scotland Rd Bridge Urban, school and residential 0.8 Channelized by earthen levee, deeply incised S About 0.25 mile downstream Saratoga-Los Gatos Rd Urban, residential and vacant land 1.8 Natural with some modification, eroding banks and some incision S About 0.25 mile upstream USGS gaging station at Hakone Gardens Open space, low density residential 2.8 Natural S Upstream Hwy 9 Bridge Crossing upstream Pierce Rd Open space 3.7 Natural

16 Water Quality Water quality sampling locations Adobe Creek - 3 sampling sites (A-1, A-2, A A-3) A San Tomas - 3 sampling sites (ST-1, ST-2, ST-3) Saratoga Creek - 4 sampling sites (S-1, S-3, S S-5, S S-7) S Sediment Quality Adobe Creek 1 sampling site (A-1) San Tomas Creek 1 sampling site (ST-1) Saratoga Creek - 1 sampling site (S-3)

17 Results and Data Analysis Data collection is screening/baseline level Bioassessments No reference conditions have been established BMI Metrics not tested for Bay Area Composite scores helpful, but may be amplified Chemical and Toxicity data Grab samples - may not be representative

18 Bioassessment Results Adobe Creek Highest composite metric scores in Hidden Villa site (A-5); urban sites were generally low (A-2,3,4). Highest value of Taxa Richness (43) and EPT Taxa (23) occurred in site A-5. A Greater distribution of FFGs in sites A-4 4 and A-5. A

19 Composite metric scores by site within Adobe Creek Site Value Normalized Average 40 Compostite Metric Score A-2 A-3 A-4 A-5 Sites

20 Adobe Creek BMI distribution among six functional feeding groups 100% 80% Other 60% Shredders Predators 40% 20% Scrapers Collector- Filterers Collector- Gatherers 0% A-2 A-3 A-4 A-5

21 Physical Habitat Assessment Results Adobe Creek Habitat quality score ranged from 101 to 150 A-5 5 was highest value; A-2 2 was lowest value Substrate score highest in the upper site correlated well with BMI composite metric scores

22 Water Quality Results Adobe Creek Temperature 11.7 to 22.2 C o A-1 A 1 in dry season Dissolved Oxygen 4.6 to 18.0 mg/l No A-3 A 3 during dry and wet season Bacterial Indicators Highest at A-2 A 2 (Terman( Park) during dry season Total and Dissolved Metals were relatively low Nutrients were highest among all sites sampled

23 Water Quality Results (cont.) Adobe Creek Diazinon not detected in any samples Toxicity Dry Season no toxicity Wet Season A-1: Slight inhibition in reproduction for Cerio

24 Sediment Quality Results Total Metals Adobe Creek Copper 31.1 mg/kg Nickel 53.5 mg/kg Mercury 0.03 mg/kg PAHs 97.5 ug/kg PCBs 1.75 ug/kg Chlorinated Pesticides generally below Method Reporting Limit (MRL)

25 Bioassessment Results San Tomas and Saratoga Creeks Bioassessment Trend of increasing composite metric scores with increasing elevation Highest value of Taxa Richness (49) and EPT Taxa (23) occurred in site S-7. S Trend of increasing FFGs distribution with increasing elevation.

26 BMI composite metric scores by site within San Tomas and Saratoga Creek Site Value Normalized Average Composite Metric Score ST-3 S-2 S-3 S-4 S-4 dup S-5 S-6 S-7 Sites

27 San Tomas and Saratoga Creek BMI distribution among six FFGs 100% 80% 60% Other Shredders Predators Scrapers 40% 20% Collector- Filterers Collector- Gatherers 0% ST-3 S-2 S-3 S-4 S-4 dup S-5 S-6 S-7

28 Physical Habitat Assessment Results San Tomas and Saratoga Creeks Habitat quality score ranged from 90 to 168 S-7 7 was highest value; ST-3 3 was lowest value Substrate score correlated well with BMI composite metric scores

29 Water Quality Results San Tomas Creek Temperature 9.1 to 24.8 C o ST-2 2 exhibited highest temp (dry season) Dissolved Oxygen 9.5 to 17.3 mg/l ST-3 3 exhibited lowest DO (dry season) Bacterial Indicators Highest value of fecal ST-1 1 (dry season) Highest value of ST-2 2 (wet season) Total and Dissolved Metals were relatively low Nutrients concentrations were relatively low

30 Water Quality Results (cont.) San Tomas Creek Diazinon not detected in any samples Toxicity No significant decreases in survival Slight inhibition of Cerio reproduction at ST-1 during wet season

31 Sediment Quality Results San Tomas Creek Copper 20.8 mg/kg Nickel 41.3 mg/kg Mercury mg/kg PAHs ug/kg PCBs 0.05 ug/kg Chlorinated Pesticides Generally below MRL

32 Water Quality Results Saratoga Creek Temperature 7.6 to 22.8 C o S-1 1 exhibited highest temp (dry season) Dissolved Oxygen 9.3 to 15.4 mg/l S-7 7 exhibited lowest DO (dry season) Bacterial Indicators Low concentrations for all samples Total and Dissolved Metals were relatively low Nutrients were relatively low

33 Water Quality Results (cont.) Saratoga Creek Diazinon not detected in any samples Toxicity No significant decreases in survival Slight inhibition of algal growth at S-3S during dry season

34 Sediment Quality Results Saratoga Creeks Copper 20.1 mg/kg Nickel 30.2 mg/kg Mercury mg/kg PAHs 5.4 ug/kg PCBs Not detected Chlorinated Pesticides Generally below MRL

35 Bioassessment Discussion Adobe Creek Composite metric scores correlate with both urbanization and stream gradient Potential impacts from channelization,, bed incision and erosion Lowest scores in entrenched channel Urban influence Habitat vs. water quality

36 Discussion Adobe Creek Water Quality Temp and D.O. supports WARM Use Bacterial indicators Little water during summer exposure/risk reduced Metals Generally low concentrations Nutrients Highest concentrations of Nitrate for all sites at A-1A Toxicity No toxicity was observed

37 Discussion San Tomas Creek Water Quality D.O. and Temp supports WARM Use Bacterial Indicators Little water during summer exposure/risk reduced Metals and nutrients Generally low concentrations Toxicity (ST-1) Slight inhibition to reproduction Cerio in the dry and wet season Selenastrum in dry season Reasons unclear

38 Bioassessment Discussion Saratoga Creek Composite metric scores correlate with both urbanization and stream gradient Potential impacts from channelization,, bed incision and erosion - Lowest scores in entrenched channel Urban influence - Habitat vs. Water Quality

39 Discussion Saratoga Creek Water Quality D.O. and Temp supports COLD Use Bacterial Indicators Low concentrations and limited access & potential for exposure Metals and nutrients Generally low concentrations Toxicity (S-3) - slight inhibition of algal reproduction Causes unclear

40 Recommended Next Steps Continuous improvement activities 1. Conduct bioassessment sampling of fish community in Adobe and Saratoga Creeks; 2. Develop and test monitoring strategy to improve assessment of recreational Uses in urban streams; 3. Evaluate and test multi-habitat rapid bioassessment methodologies in effort to measure biological integrity of highly-altered or low gradient urban stream channels;

41 Recommended Next Steps (cont) Continuous improvement activities (cont) 4. Conduct bioassessments to determine effectiveness of control measures implemented as part of existing and planned SCVURPPP projects (e.g., HMP and Sediment Assessment Work Plan); 5. Integrate measurements of channel stability in stream monitoring to supplement visual assessment of physical habitat. 6. Implement Revised MYMP

42 FY Monitoring Activities Continue to monitor Adobe Creek and San Tomas Creek watersheds New monitoring sites in Matadero/Barron, Calabazas and Sunnyvale East and West Channels Support BAMBI to further development of bioassessment tools and increase coordination of assessments Provide monitoring information to SCBWMI

43 Questions?