Effects of full-scale beach renovation on fecal indicator levels in shoreline sand and water

Rafael J. Hernandez, Yasiel Hernandez, Nasly H. Jimenez, Alan M. Piggot, James Klaus, Zhixuan Feng, Ad Reniers, Helena M Solo-Gabriele

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Recolonization of enterococci, at a non-point source beach known to contain high background levels of bacteria, was studied after a full-scale beach renovation project. The renovation involved importation of new exogenous sand, in addition to infrastructure improvements. The study's objectives were to document changes in sand and water quality and to evaluate the relative contribution of different renovation activities towards these changes. These objectives were addressed: by measuring enterococci levels in the sand and fecal indicator bacteria levels (enterococci and fecal coliform) in the water, by documenting sediment characteristics (mineralogy and biofilm levels), and by estimating changes in observable enterococci loads. Analysis of enterococci levels on surface sand and within sediment depth cores were significantly higher prior to beach renovation (6.3-72CFU/g for each sampling day) when compared to levels during and after beach renovation (0.8-12CFU/g) (P<0.01). During the renovation process, sand enterococci levels were frequently below detection limits (<0.1CFU/g). For water, exceedances in the regulatory thresholds that would trigger a beach advisory decreased by 40% for enterococci and by 90% for fecal coliform. Factors that did not change significantly between pre- and post- renovation included the enterococci loads from animals (approx. 3×1011CFU per month). Factors that were observed to change between pre- and post- renovation activities included: the composition of the beach sand (64% versus 98% quartz, and a significant decrease in biofilm levels) and loads from direct stormwater inputs (reduction of 3×1011CFU per month). Overall, this study supports that beach renovation activities contributed to improved sand and water quality resulting in a 50% decrease of observable enterococci loads due to upgrades to the stormwater infrastructure. Of interest was that the change in the sand mineralogy also coincided with changes in biofilm levels. More work is needed to evaluate the relationships between beach sand mineralogy, biofilm characteristics, and the retention of fecal indicator bacteria in sand.

Original languageEnglish
Pages (from-to)579-591
Number of pages13
JournalWater Research
Volume48
Issue number1
DOIs
StatePublished - Jan 1 2014

Fingerprint

Beaches
shoreline
beach
Sand
sand
Biofilms
Water
biofilm
Mineralogy
water
Bacteria
mineralogy
fecal coliform
stormwater
bacterium
Water quality
Sediments
infrastructure
indicator
effect

Keywords

  • Beach renovation
  • Beach sand
  • Enterococci
  • Fecal coliform
  • Fecal indicator bacteria
  • Recreational water quality

ASJC Scopus subject areas

  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Ecological Modeling

Cite this

Effects of full-scale beach renovation on fecal indicator levels in shoreline sand and water. / Hernandez, Rafael J.; Hernandez, Yasiel; Jimenez, Nasly H.; Piggot, Alan M.; Klaus, James; Feng, Zhixuan; Reniers, Ad; Solo-Gabriele, Helena M.

In: Water Research, Vol. 48, No. 1, 01.01.2014, p. 579-591.

Research output: Contribution to journalArticle

Hernandez, Rafael J. ; Hernandez, Yasiel ; Jimenez, Nasly H. ; Piggot, Alan M. ; Klaus, James ; Feng, Zhixuan ; Reniers, Ad ; Solo-Gabriele, Helena M. / Effects of full-scale beach renovation on fecal indicator levels in shoreline sand and water. In: Water Research. 2014 ; Vol. 48, No. 1. pp. 579-591.
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abstract = "Recolonization of enterococci, at a non-point source beach known to contain high background levels of bacteria, was studied after a full-scale beach renovation project. The renovation involved importation of new exogenous sand, in addition to infrastructure improvements. The study's objectives were to document changes in sand and water quality and to evaluate the relative contribution of different renovation activities towards these changes. These objectives were addressed: by measuring enterococci levels in the sand and fecal indicator bacteria levels (enterococci and fecal coliform) in the water, by documenting sediment characteristics (mineralogy and biofilm levels), and by estimating changes in observable enterococci loads. Analysis of enterococci levels on surface sand and within sediment depth cores were significantly higher prior to beach renovation (6.3-72CFU/g for each sampling day) when compared to levels during and after beach renovation (0.8-12CFU/g) (P<0.01). During the renovation process, sand enterococci levels were frequently below detection limits (<0.1CFU/g). For water, exceedances in the regulatory thresholds that would trigger a beach advisory decreased by 40{\%} for enterococci and by 90{\%} for fecal coliform. Factors that did not change significantly between pre- and post- renovation included the enterococci loads from animals (approx. 3×1011CFU per month). Factors that were observed to change between pre- and post- renovation activities included: the composition of the beach sand (64{\%} versus 98{\%} quartz, and a significant decrease in biofilm levels) and loads from direct stormwater inputs (reduction of 3×1011CFU per month). Overall, this study supports that beach renovation activities contributed to improved sand and water quality resulting in a 50{\%} decrease of observable enterococci loads due to upgrades to the stormwater infrastructure. Of interest was that the change in the sand mineralogy also coincided with changes in biofilm levels. More work is needed to evaluate the relationships between beach sand mineralogy, biofilm characteristics, and the retention of fecal indicator bacteria in sand.",
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