2.7.20. Moncrief Creek

2.7.20.1. About Moncrief Creek

Figure 2.52
Figure 2.53 The Moncrief Creek Tributary (WBID 2228).
  • North of downtown Jacksonville
  • Primary Land Use: Residential
  • Current TMDL reports: Fecal/Total Coliform with BMAP (2010), Mercury
  • Verified Impaired 2016 (final): Copper (2228A med), Iron (2228A med), Nutrients (Chlorophyll-a 228A med)
  • WBID Area: 5.9 sq. mi.
  • Beneficial Use: Class III F (Recreational – Marine)

2.7.20.2. Data sources

Result data were downloaded from the FL STORET website (DEP 2010e) and filtered based on the stations (DEP 2010f) in the Moncrief Creek WBID 2228 (DEP 2014d) shown above. The filtered dataset was used to generate Table 2.21.

2.7.20.3. Discussion

Water quality data for Moncrief Creek are shown in Table 2.21. Average phosphorus levels were higher than the recently updated WQC (DEP 2015d; DEP 2016e; DEP 2016k). Average total nitrogen and dissolved oxygen concentrations were within acceptable limits, and chlorophyll-a concentrations were only slightly elevated. Average copper concentrations were elevated relative to other tributaries and some concentrations were well above WQC.

The fecal coliform level, averaged over all the stations in Moncrief Creek, is below the critical level of 2.6, which is the logarithm of the state maximum of 400 colony-forming-units (cfu) per 100 mL. However, there is some variation in the levels depending on the location. Analysis by station is shown in Figure 2.54, going from downstream to upstream. The furthest downstream station at which fecal coliform data are available is station 20030114, near the intersection of I-95 and Norwood Avenue, and the furthest upstream station is station 20030897, near Kings Road. Beginning at station TR316 the average level exceeds the state maximum at every station. This is an old neighborhood that has been populated for many decades and contains both residential and light industrial development. South of the Martin Luther King Jr. Parkway, the average level is lower than the state maximum.

A TMDL report for fecal coliform was published for Moncrief Creek in 2006 (Wainwright 2006b). (Note: the data analyses in the TMDL are based on different criteria than that used in this report). Subsequently, a BMAP for Moncrief Creek (DEP 2010a) was released in August 2010. It describes sources of fecal coliform in the watershed, and completed and ongoing activities conducted by state and local agencies that are anticipated to reduce fecal coliform loading in the tributary. The Moncrief Creek watershed contains four permitted point sources for industrial wastewater, as well as numerous outfalls for stormwater discharge. A sewer system serves 90% of households in the watershed. WSEA estimates that there are 989 on-site sewage treatment and disposal systems (septic systems) in use. JEA has been conducting two large projects to replace or rehabilitate failing or leaking infrastructure in this watershed. COJ has constructed two wet detention projects and has worked with WSEA to add new sewer lines in order to eliminate 210 septic systems. Annual Progress Reports for this BMAP have been published annually since 2011, listing repairs, inspections, evaluations, and other improvements conducted by JEA, the Duval County Health Department, COJ, and FDOT. In the 2016 Annual Progress Report, 59% of Moncrief Creek fecal coliform measurements over a 7.5 year period ending June 30, 2016 exceeded the water quality criterion (400 CFU/100 mL) (DEP 2017a). While Moncrief Creek remains impaired for fecal coliform, the size of the exceedances has decreased since implementation of the BMAP; the median exceedance has decreased from 2,600 CFU/100 mL in the TMDL report to 1,300 CFU/100 mL in the first phase of the BMAP (2010-2014). (DEP 2016b).  There are 28 projects either planned or currently underway by COJ, JEA, and FDOT to address the BMAP in the Moncrief Creek watershed (DEP 2017a).

Moncrief Creek has been identified as impaired for copper and iron (DEP 2014g), but it has been delisted for lead (DEP 2016h). It was identified as being impaired for mercury, based on elevated levels of mercury in fish tissue; however, this is being delisted (DEP 2015b) as it has been addressed by the statewide mercury TMDL (DEP 2013e).

Table 2.21 Water quality data for Moncrief Creek.
Water QualityConcentrationSampling
ParameterCriteria (FW)LowAverageHighSamplesPeriod
Dissolved Oxygen (mg/L)34% sat. (~3.0)0.415.6811.43531998 - 2016
Total Nitrogen (mg/L)<1.540.080.975.761171998 - 2014
Total Phosphorus (mg/L)<0.1200.170.681141998 - 2015
Chlorophyll-a (µg/L)<200.512.28140.3881998 - 2015
Arsenic (µg/L)≤500.488.56124831998 - 2015
Cadmium (µg/L)≤0.300.6110.6641998 - 2015
Copper (µg/L)≤9.30.824.99401041998 - 2016
Lead (µg/L)≤3.20.234.3633.91841998 - 2015
Nickel (µg/L)≤520.043.8440771998 - 2015
Silver (µg/L)≤0.0700.331.81262001 - 2015
Zinc (µg/L)≤1200.0413.2753.061421998 - 2014
Fecal Coliform (log #/100 mL)<2.60.653.474.982602000 - 2016
Turbidity (NTU)<2908.939.91961998 - 2014
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.

 

Figure 2.53
Figure 2.54 Fecal coliform in Moncrief Creek from downstream to upstream. Data are presented as the log of the number of fecal coliform bacteria per 100 mL; the maximum, mean, and minimum values at each station are shown.