Question

1. what is the mcl for haloacetic acids?

a. 100 ppb
b. 60 ppb
c. 80 ppb
d. 120 ppb

1. what is the mcl for bromate?

a. .010 mg/l
b. .020 mg/l
c. .030 mg/l
d. .040 mg/l

1. a treatment plant operator must fill a clear well with $10,000\\ \text{ft}^3$ of water in 90 min. what is the rate of flow expressed in gpm?

a. 111 gpm
b. 831 gpm
c. 181 gpm
d. 900 gpm

Explanation:

Question 11:

MCL (Maximum Contaminant Level) for Haloacetic Acids (HAA5) is set at 80 ppb by regulatory standards (e.g., US EPA).

Question 12:

The regulatory MCL for bromate in drinking water is 0.010 mg/L (10 ppb), as established by standard drinking water guidelines.

Question 13 (Step-by-Step Calculation):

Step1: Convert volume to gallons

1 cubic foot = 7.48052 gallons.
Volume in gallons: $10,000 \times 7.48052 = 74805.2$ gallons

Step2: Convert time to minutes

Given time = 90 minutes

Step3: Calculate flow rate (GPM)

Flow rate = $\frac{\text{Total Gallons}}{\text{Total Minutes}}$
$\text{Flow Rate} = \frac{74805.2}{90} \approx 181$ GPM

Answer:

1. c. 80 ppb
2. a. .010 mg/L
3. c. 181 GPM