request for changes to settlement agreement monitoring

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

Request for Changes to Settlement

Agreement Monitoring

Pete Rawlik, SFWMDTOC Meeting,

January 29, 2009

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

TAMBR105 Information

• Historical ENP station on Tamiami Trail in Collier County sampled BWF/M

• Currently sampled by Miami Dade DERM• DERM policy changes prevent travel

outside Miami-Dade• SFWMD has negotiated with BCNP to take

over sampling, initiated in mid-January

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

S12A

Tambr105

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

S38B/NSID1

• NSID Pump Station Number 1 discharges from Broward County suburb

• WCA2A Sampling Station improperly named S38B and sampled at the discharge pipe when flowing only

• Pump can discharge in three directions – L36 north of S38B divide structure – L36 south of S38B divide structure– WCA-2A

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

NSID1 pump station and ESP Autosampler

NSID1 pump station and ESP Autosampler

NSID1 pipe discharge erroneously named S38B

NSID1 pipe discharge erroneously named S38B

S38B culvert (north- south)S38B culvert (north- south)

NSID1 pipeNSID1 pipe

NSID1 pesticide sampling point also called S38B

NSID1 pesticide sampling point also called S38B

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

NSIDPS01 discharge to WCA2A

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Limited Discharges to WCA-2A

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

S38B/NSID1, Reconfigure

• Request to clean up this situation– Relocate sampling point to upstream of

the structure– Maintain frequency of BWF, but only if

discharging to WCA-2A – New station will be coded as NSID1

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

Parameter Changes

• In May 2006, the TOC agreed to eliminate monitoring of Color, NO2, Hardness, Cd, Cu, and Zn at the vast majority of Settlement Agreement stations

• This rectified discrepancies between SA and NECP monitoring sets

• Two stations (S38B and S5A) were not included in this change

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

S5A and S38B (NSID1)Parameter Changes

• Usefulness of color questionable – S5A Turbidity (BWF/M) and TSS (Q)– S38B Turbidity and TSS (BWF)

• No excursions of Cd, Cu and Zn since prior to 2003– Limited data at S38B (N=4)(Rare

discharges)

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

S5A and S38B (NSID1)

• Request that the following parameters be eliminated at S5A and S38B– NO2– Color– Trace metals (Cd, Cu, Zn)– Hardness (Ca, Mg)

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

S5A Parameter List

• Biweekly if Flowing otherwise Monthly– TPO4, OPO4– TKN, NOX, NH4– Cl, Turbidity, Alkalinity

• Quarterly– Ca, Mg, Na, K, SiO2, SO4, TSS, Fe

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

S38B/NSID1 Parameter List

• Biweekly if Flowing– TPO4, OPO4– TKN, NOX, NH4– Cl, Turbidity, TSS, Alkalinity

• Quarterly if Flowing– Ca, Mg, Na, K, SiO2, SO4, TSS, Fe

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

CA215• CA215 is an EVPA station in WCA2A • Established to meet the requirements of the

Settlement Agreement• Station specifically located to monitor water

quality conditions near the 2-17 Stage Gauge

• Threshold Research Station U3 established for the same purpose

• U3 now a TP Rule Station

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

301 meters

240 meters

117 meters

217 gage

Location of U3 and CA215

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

CA215 and U3WQMD and Research Data

• Comparison of data from these two stations (n=70+ and n= 40+) found some differences:– Geomeans TP 5.2 vs 7.6*– Conductivity 875.2 and 851.7*– SO4 35.0 and 36.4 (Not statistically different)

• However, these differences may result from differences in methods between sampling approaches or differences in stations

• Recent data allows comparison with the same sampling approach

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

CA215 and U3WQMD Data Comparison

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Station Mean Geomean

CA215 6.1 5.6

U3 6.1 5.9

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

Request to Consolidate CA215 and U3

• Despite some statistical differences in data from differences in sampling approaches, recent data indicates that this area of WCA-2A is sufficiently characterized by one station.

• U3 has existing platforms and is a TP Rule station as well as a Research station. Therefore, U3 appears the more logical choice for retention and discontinuation of monitoring at CA215 is requested.

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

EVPA; Convert to Monthly Sampling

• Portions of WCA-2A and WCA-3A are monitored biweekly under Settlement Agreement Project EVPA

• Other marsh monitoring projects are monthly– Refuge (compliance and expanded)– Everglades National Park– Threshold Research Stations– TP Rule sampling throughout the EPA

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

Supporting Data

• Analysis of data sets from Everglades Research (monthly) and WQMD (biweekly), found no statistical difference for TP, SRP, TN and TKN at two common stations.

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0.0 0.1 0.2 0.3

Total Phosphorus (mg/L)

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Kolmogorov-Smirnov Two Sample TestProbability = 0.997

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DBHYDRO 80 0.041 0.042ERDP 34 0.044 0.042

Two Sample t-Test Results

Probability

-0.002-0.019 to 0.015

-0.255112

0.799

Difference in Means95% Confidence Interval

t-StatisticDegrees of Freedom

Comparison of Total Phosphorus at WCA-2A Marsh Stations (F1 and F4)

GroupNumber of

ObservationsDBHYDRO 80

ERDP 34

Chi-square approximation 0.248842 with 1 df

Mann-Whitney or Wilcoxon Rank Sum Test Results

Mann-Whitney U test Statistic 1279.5Probability 0.618

Rank Sum

4519.52035.5

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

Request to modify EVPA marsh monitoring

from biweekly to monthly

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

Summary

• Relocate station S38B, recode as NSID1, and sample only if discharging to WCA-2A

• Eliminate Cd, Cu, Zn, Color, and Hardness from S5A and S38B

• Transfer monitoring at CA215 to U3• Reduce frequency of EVPA

monitoring from biweekly to monthly

S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T

Discussion