110806 Eggleston

Five Years of LTMAP DataWhat does it mean? How should we adapt?: 

Five Years of LTMAP Data What does it mean? How should we adapt? Brad Eggleston Source Control Manager Palo Alto, Environmental Compliance brad.eggleston@cityofpaloalto.org (650) 329-2104

LTMAP Timeline: 

LTMAP Timeline LTMAP Plan completed Feb. 2002 Included Physical, Hydrological, Chemical, Biological, Social, and Management objectives Piers Lane stations and Newell Road station monitoring: WY 2003 - present Bear Creek station monitoring: WY 2004 and WY 2005, currently flow only Summer 2006: data review and analysis

Data Review and Analysis: Major Components: 

Data Review and Analysis: Major Components Compile data from all monitoring stations Assess spatial (site to site) differences Assess temporal trends Compare data to water quality objectives Recommend changes/improvements

Findings: 

Findings Spatial differences: used ANOVA test on means Only hardness statistically significant Dissolved copper higher at Newell 8.1 μg/L vs. 5.3 μg/L, 4.7 μg/L, and 5.5 μg/L No temporal trends observable for those plotted High variability of data important Could do power analysis to determine how many samples to see given change Some exceedances of water quality objectives Mercury, dissolved copper, aluminum, dissolved lead

Total Recoverable Mercury: 2001 – 2006(Acute WQO is 2400 ng/L; all mercury samples are collected as “ultraclean” grab samples): 

Total Recoverable Mercury: 2001 – 2006 (Acute WQO is 2400 ng/L; all mercury samples are collected as “ultraclean” grab samples)

Correlation Between Total Recoverable Mercury and log (TSS): 

Correlation Between Total Recoverable Mercury and log (TSS)

Correlation Between Methyl and Dissolved Mercury, and Total Mercury: 

Correlation Between Methyl and Dissolved Mercury, and Total Mercury

Dissolved Copper: 2002 - 2006: 

Dissolved Copper: 2002 - 2006

Hardness-Dependent Water Quality Criteria for Copper: 

Hardness-Dependent Water Quality Criteria for Copper Water Quality Criteria for some metals are hardness dependent Example: Criteria Maximum Concentration for Dissolved Copper:

Dissolved Copper: Compliance With CTRChronic Water Quality Objective: 

Dissolved Copper: Compliance With CTR Chronic Water Quality Objective CMC = 11 μg/L CMC = 25 μg/L

Total Recoverable Aluminum Data: 2002 - 2006: 

Total Recoverable Aluminum Data: 2002 - 2006

Total Recoverable Aluminum vs. log (TSS): 

Total Recoverable Aluminum vs. log (TSS)

Dissolved Lead: Compliance With CTRChronic Water Quality Objective: 

Dissolved Lead: Compliance With CTR Chronic Water Quality Objective Newell: 12/30/05 with hardness = 84; CMC ~= 50

Total Suspended Solids: 2002 - 2006: 

Total Suspended Solids: 2002 - 2006

Dissolved Nickel: Compliance With CTRChronic Water Quality Objective: 

Dissolved Nickel: Compliance With CTR Chronic Water Quality Objective

Dissolved Zinc: Compliance With CTRChronic Water Quality Objective: 

Dissolved Zinc: Compliance With CTR Chronic Water Quality Objective

Bottom Line: 

Bottom Line Organophosphate pesticides no longer detected diazinon RL is ½ of TMDL target Data highly variable  no temporal trends apparent yet Mercury CCC exceedances but typical of other Bay Area streams Dissolved copper exceedances close to State Board listing criteria

Monitoring Objectives and Challenges: 

Monitoring Objectives and Challenges Objectives for monitoring: Develop/Continue baseline for identification of long-term trends to promote health and restoration of the creek Support TMDL processes for San Francisquito Creek listings Support TMDL processes for Bay listings Investigate potential Creek impairments Challenges/Limitations Financial and staff resources to execute monitoring Laboratory costs Staff/contractor time to visit stations, compile/analyze data Ensuring use of data by RWB, decisionmakers where appropriate Providing data to SWAMP

Future Monitoring Possibilities: 

Future Monitoring Possibilities Armand’s Key Recommendations Lower RL’s for ammonia, OP pesticides, OC pesticides Drop silver from monitoring Add methyl mercury to upper watershed locations Add sediment sampling for pyrethroids, TOC, Hg, Methyl Hg, sulfate Add water and sediment toxicity testing Further Investigate Current Data Balance suggestion for copper grab samples for CMC comparisons Coordinate sampling to determine whether or not urban runoff is source of higher dissolved copper at Newell Road

Future Monitoring Possibilities: 

Future Monitoring Possibilities San Francisquito Creek TMDLs Sediment: habitat-based monitoring is key Done by SCVURPPP in other creeks Pesticide Toxicity Demonstrate that diazinon is less than 100 ng/L target: done Bedded sediment pyrethroid and toxicity testing to show other pesticides are not causing toxicity San Francisco Bay TMDLs Mercury Demonstrate that suspended sediment from SF Creek watershed meets TMDL suspended sediment target (0.2 mg/kg dry) PCBs Demonstrate that suspended sediment from SF Creek watershed meets TMDL bedded sediment target (2.5 μg/kg)