Drycleaner Site Profiles

Royal Cleaners, Clarksville, Tennessee

Description
Historical activity that resulted in contamination.

A former drycleaning facility in Clarksville, TN approximatley 4140 sq.ft. and located in a commercially zoned area was found to have soils contaminated with the historic release of drycleaning solvent perchloroethylene.

Remediation Status: In groundwater monitoring


Contaminants
Contaminants present and the highest amount detected in both soil and groundwater.


Contaminant Media Concentration (ppb) Nondetect
cis-1,2-Dichloroethene groundwater
cis-1,2-Dichloroethene soil
Tetrachloroethene (PCE) groundwater
Tetrachloroethene (PCE) soil
Trichloroethene (TCE) groundwater
Trichloroethene (TCE) soil

Site Hydrology

Deepest Significant Groundwater Contamination:  
Plume Size:   Plume Length: 35ft
Plume Width: 25ft
Plume Thickness: 20ft
Average Depth to Groundwater:   67ft

Lithology and Subsurface Geology

 
  red gravelly silty clay
Depth: 0-5ft bgs
5ft thick
 
  red very gravelly silty clay
Depth: 5-10ft bgs
5ft thick
 
  red channery silty clay firm
Depth: 10-15ft bgs
5ft thick
 
  red/brown silty clay/moist firm
Depth: 15-20ft bgs
5ft thick
 
  limestone parent material
Depth: 20-67ft bgs
47ft thick

Pathways and DNAPL Presence

checkGroundwater
Sediments
checkSoil
DNAPL Present

Vapor Intrusion Pathway

Has the potential for vapor intrusion (VI) been evaluated?
  Unknown
Has a vapor mitigation system been installed?
  No 

Remediation Scenario

Cleanup Goals:
  To achieve drinking water standards with an interim goal of plume contraction.
Remedy Level:
  Full Scale Remedy

Technologies

In Situ Chemical Oxidation
 

Why the technology was selected:
Direct injections using 40% Sodium Permanganate was selected because it will oxidize these particular concentrations of chlorinated ethenes and is effective in both saturated and unsaturated soil.

Date implemented:
9/6/2006-Initial permanganate injection event (TVG Environmental) 8/14/2007-Follow up permanganate injection (I.E.T.)

Final remediation design:
Four direct injections of 55 gallons of 40% sodium permanganate solution were injected into the permanant injection points screened from 2-12'bgs

Other technologies used:
Three injection events were completed from 9/06 to 11/06. Oxidation via Sodium Permanganate was the technology chosen. An additional injection event was completed in 8/07.

Results to date:
In MW-1 an original sample yielded 226.2 ppb Total CVOC's in 2000, by 2/08 those concentrations have decreased to 42.4. Since the most recent injection event in 8/07 a decrease from 181.6ppb has been observed. In BR-1 total CVOC's have decreased from 35.3 ppb in 2000 to 3.5ppb in 2/08 In BR-2 total CVOC's have decreased from 52.2 ppb to undetected in 2/08.

Costs

Cost for Assessment:
 
Cost for Operation and Maintenance:
 
Total Costs for Cleanup:
 

Contacts

Drycleaner Environmental Response Program
L&C Annex 4th floor
401 Church St.
Nashville TN 37243
615-532-0900

Site Specific References

1. Statement of Work 7/07