Rainfall Data (January 01, 2015 - December 31, 2017)
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SHELLFISH MANAGEMENT AREA 18 2018 ANNUAL UPDATE FFAIRS A Shellfish Sanitation Section Environmental Affairs 2600 Bull Street NVIRONMENTAL NVIRONMENTAL Columbia, SC 29201 South Carolina Department of Health and Environmental Control Environmental and of Health Department South Carolina E November 2018 WEB ADDRESS http://www.scdhec.gov/FoodSafety/ShellfishMonitoring/ SHELLFISH MANAGEMENT AREA 18 2018 ANNUAL UPDATE [ Data Through December 2017 ] Prepared By: Randy Moody, Regional Shellfish Team Lead Low Country, Environmental Quality Control – Beaufort 104 Parker Drive Burton, South Carolina 29906 Reviewer: Mike Marshall, Myrtle Beach Shellfish Team Lead Environmental Affairs – Office of Law Enforcement 927 Shine Avenue Myrtle Beach, SC 29577 TABLE OF CONTENTS Shellfish Management Area 18 Annual Update Summary ......................................................................................................................................... 2 Introduction ..................................................................................................................................... 2 Pollution Source Survey .................................................................................................................. 6 Survey Procedures .......................................................................................................................... 6 Point Source Pollution .................................................................................................................... 6 A. Municipal and Community Waste Treatment Facilities .............................................. 6 B. Industrial Waste ............................................................................................................ 6 C. Marinas ........................................................................................................................ 7 D. Radionuclides .............................................................................................................. 7 Non-point Source Pollution ............................................................................................................ 7 A. Urban and Suburban Stormwater Runoff ..................................................................... 7 B. Agricultural Runoff ...................................................................................................... 9 C. Individual Sewage Treatment and Disposal Systems .................................................. 9 D. Wildlife and Domestic Animals ................................................................................... 9 E. Boat Traffic ................................................................................................................... 9 F. Hydrographic and Habitat Modification ...................................................................... 9 Naturally Occurring Pathogens ....................................................................................................... 9 A. Marine Biotoxins .......................................................................................................... 9 B. Vibrio parahaemoliticus ............................................................................................... 9 Hydrographic and Meteorological Characteristics ........................................................................ 10 Water Quality Studies .................................................................................................................. 11 Conclusions ................................................................................................................................... 12 Recommendations ......................................................................................................................... 12 References ..................................................................................................................................... 14 Figures and Tables Figures: (1) Shellfish Growing Area 18 ......................................................................................... 15 Tables: (1) Shellfish Water Quality Sampling Stations Description ............................................. 16 (2) Fecal Coliform Bacteriological Data Summary (January 01, 2015 - December 31, 2017).....................................................................17 (3) Fecal Coliform Historical Trend Sheet........................................................................ 18 (4) Water Quality Sampling Station Data ......................................................................... 19 (5) Rainfall Data (January 01, 2015 - December 31, 2017) ............................................. 20 (6) Pollution Event Closures ............................................................................................. 24 (7) Marina Inventory ......................................................................................................... 25 Shellfish Management Area 18 – 2018 Annual Update / Page 1 2018 ANNUAL UPDATE Shellfish Management Area 18 Data Inclusive Dates: Classification Change: 01/01/15 thru 12/31/17 Yes X No Shoreline Survey Completed: Yes (I)ncreased/(D)ecreased/(N)one: N Approved Prior Report & Date: 2017 Annual Update N Conditionally Approved N Restricted N Prohibited SUMMARY The review of water quality monitoring data for Shellfish Management Area (SFMA) 18 associated with the 2018 Annual Update and this review period, indicated that water quality remained genuinely consistent with the data from last year’s review period. There will be no changes in classification for the 2018-2019 shellfish harvesting season in SFMA 18. Fecal coliform bacteriological data showed that the Okatie River had shown a slight improvement in water quality, until last year. Sample station 18-07 failed to meet the criteria for the Approved classification for the 2017 Annual Update and again this year. Similarly, data analysis for station 18-09 and 18-11, located in Chechessee Creek, has, again, failed to meet the requirement for the Approved classification. The Restricted zones that were implemented last year in these areas will not be changed this year. Area 18 was impacted by Hurricane Matthew in October 2016 and Hurricane Irma in September of 2017. The heavy rains and storm surges resulted in many sewer overflows at lift stations throughout the Lowcountry Region. INTRODUCTION PURPOSE AND SCOPE The authority to regulate the harvest, sanitation, processing and handling of shellfish is granted to the South Carolina Department of Health and Environmental Control by Section 44-1-140 of the Code of Laws of South Carolina, 1976, as amended. The Department promulgated Regulation 61-47, which provides the rules used to implement this authority and outlines the requirements applied in regulating shellfish sanitation in the State. This regulation specifically addresses classification of shellfish harvesting areas and requires that all areas be examined by sanitary and bacteriological surveys and classified into an appropriate shellfish harvesting classification. The National Shellfish Sanitation Program (NSSP) Guide for the Control of Molluscan Shellfish is used by the United States Food and Drug Administration (USFDA) to evaluate state shellfish sanitation programs. The NSSP Model Ordinance requires that a sanitary survey be in place for Shellfish Management Area 18 – 2018 Annual Update / Page 2 each growing area prior to its use as a source of shellfish for human consumption and prior to the area's classification as Approved, Conditionally Approved, Restricted, or Conditionally Restricted. Each sanitary survey shall be updated on an annual basis and accurately reflect changes which have occurred within the area. Requirement of the annual reevaluation include, at a minimum, field observations of pollution sources, an analysis of water quality data consisting of the past year’s data in combination with appropriate previously collected data, review of reports and effluent samples from pollution sources, and review of performance standards for discharges impacting the growing area. A brief report documenting the findings shall also be provided. The following criteria consistent with the NSSP Model Ordinance and S. C. Regulation 61-47 are used in establishing shellfish harvesting classifications: Approved Area - Growing areas shall be classified approved when the sanitary survey concludes that fecal material, pathogenic microorganisms, and poisonous or deleterious substances are not present in concentrations that would render shellfish unsafe for human consumption. Approved classifications shall be determined upon a sanitary survey that includes water samples collected from stations in the designated area adjacent to actual or potential sources of pollution. For waters sampled under adverse pollution conditions, the median fecal coliform Most Probable Number (MPN) or the geometric mean MPN shall not exceed fourteen per one hundred milliliters, nor shall more than ten percent of the samples exceed a fecal coliform MPN of forty-three per one hundred milliliters (per five-tube decimal dilution). For waters sampled under a systematic random sampling plan, the geometric mean fecal coliform MPN shall not exceed fourteen per one hundred milliliters, nor shall the estimated ninetieth percentile exceed an MPN of forty-three per one hundred milliliters (per five-tube decimal dilution). Computation of the estimated ninetieth percentile shall be determined using National Shellfish Sanitation