Evaluation of Water Quality Effects of Stormwater Pond Construction in Horry County, South Carolina
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1 Evaluation of Quality Effects of Stormwater Construction in Horry County, South Carolina Environmental Quality Lab Burroughs & Chapin Center for Marine and Wetland Studies Coastal Carolina University February 2010
2 FINAL RESULTS SUMMARIES AND COMPARISONS for Evaluation of Effects of Detention Construction behind Surfside Bowl Bowling Alley on Highway 17 in Surfside Beach, South Carolina by Environmental Quality Lab Burroughs & Chapin Center for Marine and Wetland Studies Coastal Carolina University February 2010 RESULTS Summaries of field and laboratory measurement results for selected water characteristics and chemical parameters in runoff water in vicinity of Surfside Bowl bowling alley on Highway 17 in Surfside Beach both prior to and after construction of a runoff detention pond and covering the ditch next to the bowling alley are provided in Tables 1 through 4 and in Figures 1 through 10. Tables 1 and 2 summarize results for pre-construction samplings. Table 1 summarizes results for dry weather conditions (i.e., no rainfall for at least 72 hours prior to sampling event). Table 2 summarizes results for wet weather conditions (i.e., significant rainfall within 24 hours of sampling event). Tables 3 and 4, dry weather and wet weather, respectively, summarize results for post-construction samplings. Because the average values provided in the tables are in most cases averages of measurements on only two sampling dates, the ranges of the values are provided on the tables but confidence intervals for the averages were not determined. Figures 1 through 10 compare the pre-construction and post-construction results for individual parameters for all sampling sites. Because of the limited number of samples and measurements for each category (i.e., usually two), it was not possible to estimate representative error bars (i.e., confidence intervals) for the averages compared. In spite of the limited sampling events and limited measurements obtained, the comparisons provide several notable observations: Prior to construction of the enlarged pond behind the bowling alley, the concentration of enterococci bacteria on the average in water flowing into the small preexisting pond decreased by about 45% (range 0% to 84%) before flowing out of the pond (Figures 1 and 2). After completion of construction that enlarged the pond behind the bowling alley and establishment of vegetation around the pond, the concentration of enterococci bacteria on the average in water flowing into the pond decreased by about 82% (range 60% to 97%) before reaching the pond outlet (Figures 1 and 2). Surfside Bowling Alley Final Results Report_Feb2010 Page 1 of 12
3 Both prior to and after the best management practice (BMP) construction (i.e., runoff detention pond and covering the ditch next to the bowling alley), turbidity levels were generally low (i.e., <10 NTU), but the BMP construction did appear to reduce turbidity levels in the water at the pond s outlet in wet weather (Figures 3 and 4). During pre-construction sampling events (Tables 1 and 2), dissolved oxygen levels at all sites were within SC DHEC water quality standards for freshwater (i.e., >5 mg/l). After BMP construction (Tables 3 and 4), dissolved oxygen levels in water flowing into the pond in both dry and wet weather were below SC DHEC water quality standards for freshwater. The BMP construction activities included piping and covering some of the primary ditch flowing into the pond. Compared to pre-construction sampling events, the sunlight blocked from some of the ditch by post-construction piping probably hindered photosynthesis and oxygen production in the ditch water and the warmer temperatures during post-construction sampling (Figures 8 and 9) probably increased bacterial decomposition and oxygen consumption in the ditch water. Both prior to and after BMP construction, flows at the sampling sites were highly variable (Tables 1 4) with, as expected, higher flows during wet weather and increasing flows the further downstream the sampling site (Figure 10). It should be noted, however, that in both dry and wet weather after BMP construction flow out of the BMP pond into the outlet weir was never observed. All wet weather sampling was conducted one day or less after a rainstorm of at least 0.5 inches of precipitation. Surfside Bowling Alley Final Results Report_Feb2010 Page 2 of 12
4 Table 1. Summary of dry weather measurement results in runoff water in vicinity of Surfside Bowl bowling alley in Surfside Beach, South Carolina. Measurements were conducted prior to completion of construction of a detention pond and covering the ditch next to the bowling alley. Parameters and Units Enterococci bacteria (MPN/100mL) Turbidity (NTU) Conductivity (µs/cm) Oxygen (mg/l) Oxygen (% saturation) ph (-log H+ activity) Air Flow (L/sec) Flow (GPM) Applicable Quality Standards or Criteria <35 <25 >5.0 >6.5, <8.5 Average a b Concentrations, (Range of Concentrations), and ((Number of Samples)) Flowing Inflow Outflow from to Outflow 1785 ( ) 3.1 ( ) 380 ( ) 6.14 ( ) 66.0 ( ) 7.12 ( ) 19.1 ( ) 25.5 (23 28) 16.1 ( ) 255 ( ) 835 ( ) 6.55 ( ) 356 ( ) 6.51 ( ) 69.9 ( ) 7.06 ( ) 19.0 ( ) 25.5 (24 27) 21.6 ( ) 342 ( ) 1136 ( ) 3.6 c ( ) 357 ( ) 6.15 ( ) 60.1 ( ) 6.99 ( ) 18.2 ( ) 24.8 (22 27) 76.9 ( ) 1219 ( ) 89 (89) 4.1 (4.1) 357 (357) 9.62 (9.62) 95.5 (95.5) 7.61 (7.61) 15.1 (15.07) 23.0 (23) 85.8 (85.8) 1359 (1359) a For enterococci bacteria the average concentrations listed are geometric mean values. b No rainfall occurred within 72 hours of sampling. Sampling dates were 11/1/07 and 11/13/07, while last rainfall was on 10/27/07. c Turbidity measurements from 11/1/07 sampling not used because of substantial turbidity increase in ditch caused by construction activities at pond. Surfside Bowling Alley Final Results Report_Feb2010 Page 3 of 12
5 Table 2. Summary of wet weather measurement results in runoff water in vicinity of Surfside Bowl bowling alley in Surfside Beach, South Carolina. Measurements were conducted prior to completion of construction of a detention pond and covering the ditch next to the bowling alley. To equally weight results for individual sampling dates, this table was revised slightly from the Table 2 provided in the pre-construction results report issued 5/26/08. Parameters and Units Enterococci bacteria (MPN/100mL) Turbidity (NTU) Conductivity (µs/cm) Oxygen (mg/l) Oxygen (% saturation) ph (-log H+ activity) Air Flow (L/sec) Flow (GPM) Applicable Quality Standards or Criteria <35 <25 >5.0 >6.5, <8.5 Average a b Concentrations, (Range of Concentrations), and ((Number of Samples)) Flowing Inflow Outflow from to Outflow 6297 ( ) 10.1 ( ) 316 ( ) 9.48 ( ) 84.4 (8 88.5) 7.26 ( ) ( ) 13.3 (13 14) 151 ( ) 2395 ( ) 2520 ( ) 18.3 ( ) 243 ( ) 8.32 ( ) 75.6 ( ) 7.20 ( ) ( ) 13 (13-13) 313 ( ) 4968 ( ) 1738 ( ) 25.4 ( ) 232 ( ) 8.20 ( ) 74.0 ( ) 7.23 ( ) ( ) 13.5 (13-14) 405 ( ) 6417 ( ) 904 ( ) 13.4 ( ) 372 ( ) 9.36 ( ) 87.2 ( ) 7.74 ( ) ( ) 13 (13 13) 389 ( ) 6172 ( ) a For enterococci bacteria the average concentrations listed are geometric mean values. b Heavy rainfall (i.e., >0.3 inches) occurred within 24 hours of sampling. Sampling dates were 12/16/07 and 1/17/08. Surfside Bowling Alley Final Results Report_Feb2010 Page 4 of 12
6 Table 3. Summary of dry weather measurement results in runoff water in vicinity of Surfside Bowl bowling alley in Surfside Beach, South Carolina. Measurements were conducted after completion of construction of a detention pond and covering the ditch next to the bowling alley. Parameters and Units Enterococci bacteria (MPN/100mL) Turbidity (NTU) Conductivity (µs/cm) Oxygen (mg/l) Oxygen (% saturation) ph (-log H+ activity) Air Flow (L/sec) Flow (GPM) Applicable Quality Standards or Criteria <35 <25 >5.0 >6.5, <8.5 Average a b Concentrations, (Range of Concentrations), and ((Number of Samples)) Flowing Inflow Outflow from to Outflow ( ) 3.10 ( ) 461 ( ) 4.24 ( ) 47.7 ( ) 7.30 ( ) 21.4 ( ) 23.5 ( ) 12.0 ( ) 191 ( ) 361 ( ) 5.50 ( ) 409 ( ) 9.16 ( ) ( ) 7.43 ( ) 23.4 ( ) 25.8 ( ) ( ) ( ) 529 ( ) 5.50 ( ) 406 ( ) 6.64 ( ) 78.9 ( ) 7.36 ( ) 22.9 ( ) 25.6 ( ) 13.0 ( ) 207 ( ) 26.2 ( ) 4.78 ( ) 350 ( ) 7.51 ( ) 91.0 ( ) 7.80 ( ) 25.0 ( ) 23.6 (17.1 3) 29.9 ( ) 474 ( ) a For enterococci bacteria the average concentrations listed are geometric mean values. b No rainfall occurred within 72 hours of sampling. Sampling dates were 6/22/09 and 11/3/09, while last rainfalls were on 6/16/09 and 10/31/09, respectively. Surfside Bowling Alley Final Results Report_Feb2010 Page 5 of 12
7 Table 4. Summary of wet weather measurement results in runoff water in vicinity of Surfside Bowl bowling alley in Surfside Beach, South Carolina. Measurements were conducted after completion of construction of a detention pond and covering the ditch next to the bowling alley. Parameters and Units Enterococci bacteria (MPN/100mL) Turbidity (NTU) Conductivity (µs/cm) Oxygen (mg/l) Oxygen (% saturation) ph (-log H+ activity) Air Flow (L/sec) Flow (GPM) Applicable Quality Standards or Criteria <35 <25 >5.0 >6.5, <8.5 Average a b Concentrations, (Range of Concentrations), and ((Number of Samples)) Flowing Inflow Outflow from to Outflow 5052 ( ) 4.39 ( ) 330 ( ) 3.08 ( ) 38.8 ( ) 7.04 ( ) 27.2 ( ) 30.5 (29 32) 32.6 ( ) 516 ( ) 1242 ( ) 7.62 ( ) 302 ( ) 5.34 ( ) 68.1 ( ) 7.22 ( ) 27.2 ( ) 31 (30-33) ( ) ( ) 1722 ( ) 6.04 ( ) 300 ( ) 6.24 ( ) 79.9 ( ) 7.17 ( ) 28.2 ( ) 31 (29-33) 24.4 ( ) 387 ( ) 127 ( ) 8.38 ( ) 312 ( ) 7.41 ( ) 95.6 ( ) 7.66 ( ) 28.4 ( ) 31 (30 32) 71.5 (0 143) 1134 (0 2268) a For enterococci bacteria the average concentrations listed are geometric mean values. b Heavy rainfall (i.e., >0.3 inches) occurred within 24 hours of sampling. Sampling dates were 6/17/09 and 7/14/09. Surfside Bowling Alley Final Results Report_Feb2010 Page 6 of 12
8 Figure 1. Surfside Bowling Alley BMP Effects - Enterococci Average Enterococci Bacteria (MPN/100 ml) Inlet Inlet Figure Surfside Bowling Alley BMP Effects Enterococci Bacteria Allow ed Vegetation to Establish Around BMP 0 9/1/07 11/1/07 1/1/08 3/1/08 5/1/08 7/1/08 9/1/08 11/1/08 1/1/09 3/1/09 5/1/09 7/1/09 9/1/09 11/1/09 Pre-BMP Dry Pre-BMP Wet Post-BMP Dry Post-BMP Wet Surfside Bowling Alley Final Results Report_Feb2010 Page 7 of 12
9 Figure 3. Surfside Bowling Alley BMP Effects - Turbidity 3 Average Turbidity (NTU) Inlet Inlet Figure 4. Surfside Bowling Alley BMP Effects Turbidity Turbidity (NTU /1/07 12/1/07 3/1/08 6/1/08 Allow ed Vegetation to Establish Around BMP 9/1/08 12/1/08 3/1/09 6/1/09 9/1/09 12/1/09 Pre-BMP Dry Pre-BMP Wet Post-BMP Dry Post-BMP Wet Surfside Bowling Alley Final Results Report_Feb2010 Page 8 of 12
10 Figure 5. Surfside Bowling Alley BMP Effects - DO Average Oxygen (mg/l) Inlet Inlet Figure 6. Surfside Bowling Alley BMP Effects - % DO Average Oxygen (%saturation) Inlet Inlet Surfside Bowling Alley Final Results Report_Feb2010 Page 9 of 12
11 Figure 7. Surfside Bowling Alley BMP Effects - ph 8.00 Average ph (-logh+ activity) Inlet Inlet Figure 8. Surfside Bowling Alley BMP Effects - Temp 3 Average (ºC) Inlet Inlet Surfside Bowling Alley Final Results Report_Feb2010 Page 10 of 12
12 Figure 9. Surfside Bowling Alley BMP Effects - Air Temp Average Air temperature (ºC) Inlet Inlet Figure 10. Surfside Bowling Alley BMP Effects - Flow Average Flow (GPM) Inlet Inlet Surfside Bowling Alley Final Results Report_Feb2010 Page 11 of 12
13 Please do not hesitate to contact me if you have any questions concerning the information provided or if you desire additional information. Sincerely yours, Joseph T. Bennett, Ph.D. Laboratory Technical Director (843) Coastal Carolina University Environmental Quality Lab P.O. Box Conway, SC Surfside Bowling Alley Final Results Report_Feb2010 Page 12 of 12
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