{
  "url": "https://openlegislation.uk/bathing-waters-scotland-regulations-2008/schedule-3/paragraph-2",
  "json_url": "https://openlegislation.uk/bathing-waters-scotland-regulations-2008/schedule-3/paragraph-2.json",
  "legislation": "ssi/2008/170",
  "legislation_title": "The Bathing Waters (Scotland) Regulations 2008",
  "legislation_url": "https://openlegislation.uk/bathing-waters-scotland-regulations-2008",
  "path": "schedule/3/paragraph/2",
  "kind": "paragraph",
  "number": "2",
  "heading": "Methodology",
  "text": "(1) In this Schedule, “percentile value” is based on a percentile evaluation of the log10 normal probability density function of microbiological data used for the assessment under regulation 9.\n(2) SEPA must derive a percentile value as follows–\n(a) take the log10 value of all bacterial concentrations in the data sequence to be evaluated or, if a zero value is obtained, take the log10 value of the minimum detection limit of the analytical method used;\n(b) calculate the arithmetic mean (“μ”) of the log10 values taken under paragraph (a);\n(c) calculate the standard deviation (“σ”) of the log10 values taken under paragraph (a);\n(d) derive the upper 90-percentile point of the data probability density function from the following equation: upper 90-percentile = antilog (μ + 1.282 σ); and\n(e) derive the upper 95-percentile point of the data probability density function from the following equation: upper 95-percentile = antilog (μ + 1.645 σ).",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/ssi/2008/170/schedule/3/paragraph/2",
    "retrieved_at": "2026-10-28T22:07:15.175457+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}