# Draft 2008 California 303(d)/305(b) Integrated Report

# Supporting Information

## Regional Board 3 - Central Coast Region

Water Body Name: | Pacific Ocean at Pismo Beach (San Luis Obispo County)
Water Body ID: | CAC3102601420070501120708
Water Body Type: | Coastal & Bay Shoreline

DECISION ID | 5896
Pollutant: | Indicator Bacteria
Final Listing Decision: | Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2006)
Revision Status | Revised
Reason for Delisting: | Change from general pollutant to specific pollutant listing (e.g. metals to copper)
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | Pismo Beach was listed in 2006 by USEPA. Since that time, the County of San Luis Obispo has increased the number of monitoring stations and the reach of beach identified in this USEPA assessment has been further divided. This original assessment conducted by USEPA will be replaced by three assessments, one for each of the indicator bacteria for which there are data. See Pacific Ocean at Pismo Beach, south of Pismo Pier for the individual assessments that replace this one.
RWQCB Board Decision / Staff Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because the general pollutant "Indicator Bacteria" will be replaced with individual assessments for each indicator.
SWRCB Board Decision / Staff Recommendation: | N/A
USEPA Decision: | The USEPA final decision for the 2006 303(d) list was to list this water body segment for indicator bacteria.

Lines of Evidence (LOEs) for Decision ID 5896

LOE ID: | 380
Pollutant: | Indicator Bacteria
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Water Contact Recreation
Number of Samples: | 219
Number of Exceedances: | 20
Data and Information Type: | PATHOGEN MONITORING
Data Used to Assess Water Quality: | Available data indicate sufficient exceedances of bacterial indicator objectives. There were 15 out of 165 samples exceeding the geomean for enterococci, and 20 out of 219 samples exceeding the single sample maximum for fecal coliform (USEPA, 2007).
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | Title 17 C.C.R. Section 7958 states: Based on a single sample, the density of bacteria in water from each sampling station at a public beach or public water contact sports area shall not exceed: (A) 1,000 total coliform bacteria per 100 milliliters, if the ratio of fecal/total coliform bacteria exceeds 0.1; or (B) 10,000 total coliform bacteria per 100 milliliters; or (C) 400 fecal coliform bacteria per 100 milliliters; or (D) 104 enterococcus bacteria per 100 milliliters. Based on the mean of the logarithms of the results of at least five weekly samples during any 30-day sampling period, the density of bacteria in water from any sampling station at a public beach or public water contact sports area, shall not exceed: (A) 1,000 total coliform bacteria per 100 milliliters; or (B) 200 fecal coliform bacteria per 100 milliliters; or (C) 35 enterococcus bacteria per 100 milliliters. (DHS, 1999)
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Station ID# PB4 (Pismo Beach Pier, 50 feet south of the pier)
Temporal Representation: | 04/03/01-10/25/2005
Environmental Conditions: |
QAPP Information: | Data record: 2001-2005, San Luis Obispo County Health Dept.
QAPP Information Reference(s):