Heated Soil Vapor Extraction (HSVE) Pilot Project at United Cleaners Lemont, Illinois

Juho So, Ph.D. IDERTF

Overview

� 1. Chronicles � 2. What is HSVE � 3. Technical Information � 4. Cost Information � 5. Future Plans � 6. Lessons Learned � 7. Q & A

Chronicles

� 08/15/01: Claim was filed � 01/23/02: Initial site investigation completed

SOW Depth Contamination a. 8 SBs 15 ft 4,300 ppm (~ 3 ft)

2,540 ppm (~15 ft) b. 11SBs&4MWs 35 ft 48 ppm (~ 7 ft) c. 10 SBs 50 ft 480 ppm (~ 6 ft) d. 4 SBs 15 ft Not Happened !!

Remediation Objectives (RO) for PCE: 110 ppm (Ingestion)

Chronicles (Continued)

� 02/21/02: Remedial Action Plan (RAP) � 02/21/02: Projected Pilot Project Costs

� Consulting: $ 35,000.00� Vendor Cost $ 27,502.15

� 09/02/02: Initial Installation � Dec. 02: Confirmatory SI Å Failed to Meet the RO � Jan. 03 : 60-days extension Å Failed to Meet the RO � Mar. 03 :120 days extension Å Failed to Meet the RO

Æ Found more (?) PCE: 4,700 ppm (~ 4 ft)1,300 ppm (~ 24 ft)

� 12/05/03: Additional Site Investigation � 12 SBs (32 ft) Å mostly delineated (by RO)

Heated Soil Vapor Extraction (HSVE) System

� Enhances the volatilization of VOCs by supplemental heat � Heat Source: Underground pipes which contain heated material � Heated Material: water (or oil with polymer) � Strengths:

� Relatively easy to install & inexpensive� Faster result than conventional SVE system

� Weaknesses: � Occupies a larger space than conventional SVE system � Additional heat source is needed � More maintenance is required (boiler failure) � Retains all of the problems of SVE system (short circuit, etc.)

Technical Information

� 41 SBs (or 33 SBs) & 4 MWs (dry): 50 ft � Deepest Contamination at 24 ft � Highest Contamination: 4,700 ppm � Area to be Remediated: 40 ft (H) x 20 ft (W) � Volume to be Remediated: 40 ft (H) x 20 ft (W) x 30 ft (D)

(due to depth Æ much larger area Æ much more volume !)

� No GW down to 50 ft� K (Hydraulic Conductivity) = 1 x 10-8 cm/sec (lab test)� FOC (Fraction of Organic Carbon) = 1.3 % - 2.0 %� Soil Type: very tight clay.

Cost Information ($109,536.91 as of 04/30/2004) � Site Investigation: $44,054.76� 33 SBs & 4 MWs � 90 VOCs � Note: SI Cost for 8 SBs before the Fund:

$8,000 is NOT Included.

� HSVE Pilot Project: $65,482.15� $ 2,980.00: RAP � $ 62,502.15 HSVE Installation &

Maintenance)

Future PlansRemediation Objectives for PCE: 408 ppm (Csat)

� Evaluating the Following Remedial Technologies: � Options Issues

� Chemical Oxidation a. Overkill for Oxidant: FOC = 1.3 % ~ 2.0 % b. Many many injection points: K= 1x 10-8 cm./sec

� Excavation a. Down to 30 ft Structural Issue

� Electrical Heating a. Cost $500,000 and up (?) b. Utility Issues

Lessons Learned

� The more soil borings, the better it is� Especially in the tight clay soil zone� Hit or Miss?

� Be realistically optimistic � Vendor’s statement: 80- 90 % of contamination

removal in 2 months according to the modeling bysuper computer (!!)

� Takes longer than expected. � Tight clay is always the problem.

� Sanders Cleaners � Two additional Injections � Three times more costs than originally expected

(if successful !?).

Q & A

� Any Advice ?!