2.7.18. McCoy Creek About McCoy Creek

Figure 2.50
Figure 2.51 The McCoy Creek Tributary (WBID 2257).
  • West of the St. Johns River Downtown
  • Primary Land Use: Residential
  • Current TMDL reports: Fecal Coliform
  • Verified Impaired 2016 (final): None
  • WBID Area: 5.34 sq. mi.
  • Beneficial Use: Class III F (Recreational – Freshwater) Data sources

Result data was downloaded from the FL STORET website (DEP 2010e) and filtered based on the stations (DEP 2010f) in McCoy Creek WBID 2257 (DEP 2014d) shown above. The filtered dataset was used to generate Table 2.19. Discussion

Water quality data for McCoy Creek are shown in Table 2.19. The fecal coliform level, averaged over all the stations in McCoy Creek, is above the critical level of 2.6, which is the logarithm of the state maximum of 400 colony-forming-units (cfu) per 100 mL. Thus, a TMDL for fecal coliform was published in 2009 (Rich-Zeisler and Kingon 2009). (Note: the data analysis in the TMDL is based on different criteria than that used in this report). Subsequently, a BMAP for McCoy Creek was legally adopted in 2010 (DEP 2010a). Annual Progress Reports for this BMAP were published in 2011 (DEP 2011b), 2012 (DEP 2013b), and 2013 (DEP 2013b); they list repairs, inspections, evaluations, and other improvements conducted by JEA, the Duval County Health Department, COJ, and FDOT.

Average dissolved oxygen (DO) levels are below the WQC but are above the SSAC of 4.0 mg/L for DO in the mainstem and tributaries (DEP 2014c).

Table 2.19 Water quality data for McCoy Creek.
Water QualityConcentrationSampling
ParameterCriteria (FW)LowAverageHighSamplesPeriod
Dissolved Oxygen (mg/L)34% sat. (~3.0)0.75.1891.43022000 - 2016
Total Nitrogen (mg/L)<1.540.190.871.61612000 - 2013
Total Phosphorus (mg/L)< - 2013
Chlorophyll-a (µg/L)<200.282.6121222000 - 2013
Arsenic (µg/L)≤500.0022.968.38282000 - 2008
Cadmium (µg/L)≤0.30.0021.5925702000 - 2008
Copper (µg/L)≤ - 2008
Lead (µg/L)≤3.207.7450872000 - 2008
Nickel (µg/L)≤5204.1550792000 - 2008
Silver (µg/L)≤0.0700.45282000 - 2008
Zinc (µg/L)≤1200.0420.15317.62822000 - 2008
Fecal Coliform (log #/100 mL)<2.603.424.92502000 - 2016
Turbidity (NTU)<291.48.0471.22452000 - 2016
Note: Hardness-dependent freshwater criteria for cadmium, copper, lead, nickel, and zinc were generated based on a hardness concentration of 100 mg/L.
FW = freshwater; SW = saltwater (marine). Values denoted with (*) indicate a proposed criterion, which has not yet been adopted.
Values denoted with (†) are reference values based on EPA criteria (EPA 2010b), but the water body is not regulated by this standard.