Posted on

EXH AR024650: 3RWN Ambient & Effluent Discharge Joint Probability Analysis

Document Library
Sea-Tac Airport
Third Runway
PCHB
Box 10

This document presents a statistical analysis of ambient water conditions and effluent discharge at a location designated 3RWN, examining the joint probability of stream flow and discharge occurring simultaneously. It includes a 3D probability surface chart, a data table showing dilution factors ranging from 3.6 to 5,294 at various probability levels, and a distribution curve of ambient stream discharge measured in cubic feet per second. The analysis notes that effluent is present approximately 38% of the time, with the 7Q10 flow of 0.16 cfs corroborating the 1st percentile and the 5Q30 flow of 0.15 cfs corroborating the 0.9th percentile.

Open full document

Notes

Administrative Record document AR024650-AR024652 presenting joint probability (P) analysis for 3RWN (Third Runway North) ambient and effluent discharge conditions at Sea-Tac Airport. Includes 3D surface plot of joint probability versus ambient percentile and effluent percentile, tabular data on time and dilution factors (DF) compared to joint probability P, and approximate ambient distribution curve for 3RWN discharge (cfs). Key statistics: P=0.612 for zero effluent; 7Q10 flow (0.16 cfs) corroborates 1st percentile; 5Q30 flow (0.15 cfs) corroborates 0.9th percentile; effluent present approximately 38% of time; dilution factors range from minimum 3.6 to maximum 5294; unique DF count up to 1520. Part of Third Runway EIS record before the Pollution Control Hearings Board (PCHB) of Washington State.

Sidebar On/Off
V V