ZuoTi.Pro
Question

calculate dispersivity

During the investigation of a contaminated site, a large tank was used to store water pumped from a contaminated aquifer.  The tank, which had been placed downgradient of the area of contamination where the underlying aquifer was not contaminated, suddenly leaked all of the contents.  The water in the tank had a concentration of 23.4 mg/L of trichloroethane (TCA).  The tank was round with a diameter of 5 m. The spill was located under the tank and saturated the aquifer.  The aquifer had an average linear groundwater velocity of 0.033 m/d.  Assume that the tanks were centered on a grid at locations x=0 and y=0.  There is monitoring well located downgradient at x=7.4 m and y=1.1 m. The transverse dispersivity is assumed to be 10% of the longitudinal dispersivity.  What will the concentration of TCA be in the monitoring well 120 days after the leak?  Account for scale effects when you calculate dispersivity and express your answer in mg/L.

Civil-Engineering   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Request Professional Answer

Request Answer!

We need at least 10 more requests to produce the answer.

0 / 10 have requested this problem solution

The more requests, the faster the answer.

Request! (Login Required)

All students who have requested the answer will be notified once they are available.
Know the answer?
Add Answer to:
calculate dispersivity
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Similar Homework Help Questions

  • 4. A storage basin for aqueous Cadmium waste with a cadmium concentration of 32 mg/L has...

    4. A storage basin for aqueous Cadmium waste with a cadmium concentration of 32 mg/L has leaked into a nearby aquifer. A drinking water well is located 980 m downgradient from the leaking. To ensure the safety of the drinking-water supply, a monitoring well is drilled 4 between the drinking-water and the cadmium waste spill. The difference in hydraulic head between the drinking-water well and the monitoring well is 75 cm (with the head in the monitoring well higher). If...

  • calculate concentration

    A metal plating company has been discharging plating waste that contains hexavalent chromium (Cr6+) into an on-site dry well for many years. The aquifer is 2.11 m thick.  The waste solution has a chromium concentration of 35 mg/L and the amount being discharged amounts to 3.45 m3/d. The groundwater velocity is 0.012 m/d.  What is the concentration of chromium in a private well located in the same aquifer at location x = 34.0 m and y = 6.23 m?  Assume...

  • 5. A groundwater containing 50 mg/L of Trichloroethane (TCA) will be treated in a rectangular PFTR...

    5. A groundwater containing 50 mg/L of Trichloroethane (TCA) will be treated in a rectangular PFTR reactor as shown below. The reactor is open to atmosphere. The water flows through the reactor with a constant velocity of (V) of 1 m/min. TCA can be removed in PFTR by evaporation and biochemical degradation. For evaporation of TCA, the two-film mass transfer coefficient (KA2) is given as 20 cm/h, while for the biodegradation of TCA, the first-order reaction rate constant (ki) is...

  • 1. Some pond water contains 20.O mg/L of some algae, which can be represented by the chemical for...

    1. Some pond water contains 20.O mg/L of some algae, which can be represented by the chemical formula CsHisO&N. Using the following reactions: CoHisO&N606CO2 6H2ONHa NHs 202 NOs H2O (a) Find the theoretical carbonaceous oxygen demand CBOD (b) Find the nitrogenous oxygen demand NBOD (c) Find the total theoretical biochemical oxygen demand BOD 2. A sandy soil has a hydraulic conductivity of 6.1 x104 m/d, a hydraulic gradient of 0.00141, and porosity of 20%. (a)what is the Darcy velocity (b)what...

  • A midwest farm is contaminated with Aldrin. Preliminary tests indicate that most of the contamination is...

    A midwest farm is contaminated with Aldrin. Preliminary tests indicate that most of the contamination is below the water table. The contaminant concentration in ground-water averages 1.2 mg/L. The measured soil organic carbon is 0.3%, and pure water occupies 50% of the aquifer volume. Estimate the Koc, Kp, and S. log Kow of Aldrin is 6.5

  • A farmer needs to purchase a pump to bring water from a well at a rate...

    A farmer needs to purchase a pump to bring water from a well at a rate of 4 L/s to irrigate his crops. The water table in the aquifer is at a depth 20 m below the ground surface at the extraction site. From the extraction site, water is pumped to a storage tank located 58 m above the well. Altogether, the needed piping has a length of 420 m and all lines are 5 cm plastic piping. There are...

  • A laboratory column experiment is set up to test the transport of oil spilled in a sandy aquifer. The test column, 5 cm in diameter and 0.75 m in length, is packed with sand having a median grain dia...

    A laboratory column experiment is set up to test the transport of oil spilled in a sandy aquifer. The test column, 5 cm in diameter and 0.75 m in length, is packed with sand having a median grain diameter of approximately 0.5 mm and porosity of 0.27. The sand was taken from a natural river bed; therefore, microbes-related biological process is expected to present. A mixture of feed solution containing conservative Cl and a surrogate biodegradable hydrocarbon is continuously pumped...

  • WSE3701

    QUESTION 2 Discuss how porosity and particle size affect a well’s ability to provide enough quantities of water. (10) QUESTION 3 Calculate the transmissivity of an artesian aquifer that has a thickness of 5.5 m and is pumped at a rate of 1.52 m3 /min. There are two observation wells located at 150 m and 280 m away with drawdowns of 0.8 and 0.72 m respectively. (10)  QUESTION 4 An aquifer has T = 175 m2 /day, S = 1.3 x10-4, and provides a flow...

  • A groundwater sample obtained near a septic tank has a pH of 6.90 and HCO3- concentration...

    A groundwater sample obtained near a septic tank has a pH of 6.90 and HCO3- concentration of 8.25 mmol L-1. The source of bicarbonate is from the carbon dioxide produced from microbes and the process can be presented as the following chemical equation. CO2 (g) + 2H2O (l) ⇌ HCO3- (aq) + H3O+ (aq)    Ka = 4.5x10-7 Provided with a Henry’s constant of CO2 as 0.034 M/atm, answer the following questions. Use an ICE table and work backward to determine...

  • A mixture of benzene, Napthalene, trichloroethylene and chlorobenzene were found in a groundwater plume.   Consider the...

    A mixture of benzene, Napthalene, trichloroethylene and chlorobenzene were found in a groundwater plume.   Consider the partitioning of these four compounds in a contaminated soil. Assume that the hydrocarbon mixture has contaminated the soil at an average of 0.09 liters of the mixture per cubic meter of soil. Considering the soil above and below the water table (ie. each cubic meter is 60% saturated with water by volume). The soil contains 0.75% organic carbon and has a porosity of 30%...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT