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A truck carrying road salt crashed, spilling the salt near a spring where it entered an aquifer. The breakthrough curve below shows sodium concentration at an observation well drilled 35 m downgradient from the spill site. 700 Breakthrough Curve at 35 m Solute Concentration (mg/L) 200 300 600 ggg 400 500 100 0 0 10 20 30 40 50 Time (d) а. b. Based on the breakthrough curve, determine the average velocity, the standard deviation in time (a), and the dispersion coefficient (DL) of sodium in this aquifer. A drinking water supply well is located 1,000 m downgradient of the spill site. There is no MCL for sodium in drinking water, but health guidelines recommend that concentrations be kept to less than 20 mg/L. How long before this 20 mg/L limit is exceeded at the drinking water supply well?

A truck carrying road salt crashed, spilling the salt near a spring where it entered an aquifer. The breakthrough curve below shows sodium concentration at an observation well drilled 35 m downgradient from the spill site. 700 Breakthrough Curve at 35 m Solute Concentration (mg/L) 200 300 600 ggg 400 500 100 0 0 10 20 30 40 50 Time (d) а. b. Based on the breakthrough curve, determine the average velocity, the standard deviation in time (a), and the dispersion coefficient (DL) of sodium in this aquifer. A drinking water supply well is located 1,000 m downgradient of the spill site. There is no MCL for sodium in drinking water, but health guidelines recommend that concentrations be kept to less than 20 mg/L. How long before this 20 mg/L limit is exceeded at the drinking water supply well?

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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4. A truck carrying road salt crashed, spilling the salt near a spring where it entered an aquifer. The breakthrough curve below shows sodi um concentration at an observation well drilled 35 m downgradient from the spill site. Breakthrough Curve at 35 m a. Solute Concentration (mg/L) 700 600 500 400 300 200 100 0 0 10 20 Time (d) 30 40 50 Based on the breakthrough curve, determine the average velocity, the standard deviation in time (a), and the dispersion coefficient (DL) of sodium in this aquifer. b. A drinking water supply well is located 1,000 m downgradient of the spill site. There is no MCL for sodium in drinking water, but health guidelines recommend that concentrations be kept to less than 20 mg/L. How long before this 20 mg/L limit is exceeded at the drinking water supply well?
Transcribed Image Text:4. A truck carrying road salt crashed, spilling the salt near a spring where it entered an aquifer. The breakthrough curve below shows sodi um concentration at an observation well drilled 35 m downgradient from the spill site. Breakthrough Curve at 35 m a. Solute Concentration (mg/L) 700 600 500 400 300 200 100 0 0 10 20 Time (d) 30 40 50 Based on the breakthrough curve, determine the average velocity, the standard deviation in time (a), and the dispersion coefficient (DL) of sodium in this aquifer. b. A drinking water supply well is located 1,000 m downgradient of the spill site. There is no MCL for sodium in drinking water, but health guidelines recommend that concentrations be kept to less than 20 mg/L. How long before this 20 mg/L limit is exceeded at the drinking water supply well?
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