Drycleaner Site Profiles

Former Summer Custom Cleaners, Memphis, Tennessee

Description
Historical activity that resulted in contamination.

The site operated as a drycleaning facility from 1968 until 2005. The facility is part of a three store strip mall that is currently being used as a clothing retailer. PCE was the only drycleaning solvent used on the property. The contamination source area is located in the rear of the facility in the location of the former drycleaning machine. There are no municipal drinking water wells within a one-mile radius of the site, nor any private drinking water wells in the vicinity of the site.

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:  
Average Depth to Groundwater:   12ft

Lithology and Subsurface Geology

 
  Brown-gray silty clays
Depth: 0-28.5ft bgs
28.5ft thick
Conductivity: 0.002834646ft/day
Gradient: 0.02ft/ft
 
  sand and gravels
Depth: 28.5ft bgs

Pathways and DNAPL Presence

checkGroundwater
Sediments
Soil
DNAPL Present

Vapor Intrusion Pathway

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

Remediation Scenario

Cleanup Goals:
  To achieve drinking water standards, while working towards an interim goal of plume contraction.
Remedy Level:
  Full Scale Remedy

Technologies

In Situ Biostimulation
 

Why the technology was selected:
Enhanced reductive dechlorination was selected at the Former Summer Custom Cleaners site by Innovative Environmental Technologies (IET)due to the concentration levels of PCE's anaerobic daughter products that indicated that reductive dechlorination was occurring at the site and needed to be stimulated.

Date implemented:
Fall 2008- Biostimulation and Zero Valent Iron

Final remediation design:
Innovative Environmental Technologies Inc implemented and designed the full-scale remedial design for the site. 18 direct-push injections were advanced at the site to distribute remedial materials from 15-17 feet bgs and 22-24 feet bgs. These depths were chosen at the site based on the depths of the sand and gravel layers across the site. The remedial event distributed 2,640 pounds of ZVI, 800 pounds of calcium propionate, 200 pounds of yeast extract, 160 pounds of an oxygen scavenger, vitamins B-2 and B-12, and 1,500 pounds of HRC.

Results to date:
The immediately affected on-site well has experienced a large decrease in all CVOC concentrations, with PCE concentrations decreasing by 92.74% after ten months following the injection event. The concentration of PCE decreased from 4,009 ug/L in November 2007 to 990 ug/L in April 2009, 4 months after the injection event, to 291 ug/L, 10 months after the injection event. The closely affected on-site wells (wells outside of the remedial event's radius of influence) have experienced large decreases in all CVOC concentrations. In all but one monitoring well, CVOC decreases were in excess of 70% since the injection event.

Next Steps:
Another round of sampling is approved for Spring 2010.

Cost to Design and Implement:
$100,293

In Situ Zero Valent Iron
 

Why the technology was selected:
Enhanced reductive dechlorination was selected at the Former Summer Custom Cleaners site by Innovative Environmental Technologies (IET)due to the concentration levels of PCE's anaerobic daughter products that indicated that reductive dechlorination was occurring at the site and needed to be stimulated.

Date implemented:
Fall 2008- Biostimulation and Zero Valent Iron

Final remediation design:
Innovative Environmental Technologies Inc implemented and designed the full-scale remedial design for the site. 18 direct-push injections were advanced at the site to distribute remedial materials from 15-17 feet bgs and 22-24 feet bgs. These depths were chosen at the site based on the depths of the sand and gravel layers across the site. The remedial event distributed 2,640 pounds of ZVI, 800 pounds of calcium propionate, 200 pounds of yeast extract, 160 pounds of an oxygen scavenger, vitamins B-2 and B-12, and 1,500 pounds of HRC.

Results to date:
The immediately affected on-site well has experienced a large decrease in all CVOC concentrations, with PCE concentrations decreasing by 92.74% after ten months following the injection event. The concentration of PCE decreased from 4,009 ug/L in November 2007 to 990 ug/L in April 2009, 4 months after the injection event, to 291 ug/L, 10 months after the injection event. The closely affected on-site wells (wells outside of the remedial event's radius of influence) have experienced large decreases in all CVOC concentrations. In all but one monitoring well, CVOC decreases were in excess of 70% since the injection event.

Next Steps:
Another round of sampling is approved for Spring 2010.

Cost to Design and Implement:
$100,293

Costs

Cost for Assessment:
  $113,521
Cost for Operation and Maintenance:
 
Total Costs for Cleanup:
  $213,814.00

Contacts

Nancy Boisvert
Program Manager
TDEC-DoR
Drycleaner Response Program
401 Church St. Nashville TN
615-263-3876

Elizabeth Bishop
Innovative Environmental Technologies
6130 Kit Road, Pipersville, PA
www.iet-inc.net
888-721-8283
elizabethbishop@iet-inc.net