December 2008 Informational Meeting Regarding the Status of Ground Water Cleanup Activities Undertaken by Nor-Lake, Inc.

Transcription

1 December 2008 Informational Meeting Regarding the Status of Ground Water Cleanup Activities Undertaken by Nor-Lake, Inc.

2 Welcome! Site Investigation and Remediation Activities Update Chuck Dullea, President, Nor-Lake, Inc. James A. Anklam, PE, Ayres Associates Lori A. Rosemore, PG, Ayres Associates

3 History of Ground Water Investigation and Remediation Activities in the Town of Hudson Junker Landfill Investigation and Remediation Town of Warren TCE Investigation and Remediation Nor-Lake Investigation and Remediation

4 Junker Landfill Investigation and Remediation Located approximately 3.5 miles east of Daily Road The landfill operated for approximately 16 years The landfill was closed and capped in the late 1980 s The remediation system on site is an active landfill gas system and leachate collection system Has documented ground water contamination extending from the landfill westward Potentially co-mingles with the Nor-Lake plume and continues westward Residential water supplies within the Junker s s Area of Concern all have carbon filter systems paid for by the Junker s s Landfill Trust

5 Town of Warren TCE Investigation and Remediation Located approximately 4.5 miles east of Daily Road Discovered in 1999 Investigation activities occurred in 2000, no soil contamination Remediation of ground water by injection of sodium permanganate Ground water contamination extending from 80 th Avenue west/northwest Potentially co-mingles with the Junker s s plume and continues westward Residential water supplies can have carbon filter systems if residents pay for them

6 Nor-Lake Investigation and Remediation Located approximately 1 mile east of Daily Road Discovered in the mid 1980 s Documented soil contamination and elevated levels of trichloroethene (TCE) and other compounds in groundwater Investigation activities occurred in late 1980 s s until mid 1990 s Ground water contamination extends from Co. Rd. U west/northwest Active ground water and soil remediation systems Residential water supplies that qualify have carbon filter systems provided by Nor-Lake, Inc.

7 Special Well Construction Areas

8 Nor-Lake: Site Investigation 30 monitoring wells Over 250 private wells Volatile Organic Compounds (VOCs) primary compound is trichloroethene (TCE)

9 Nor-Lake: Remediation Pump and treat began 1986 Well testing completed on RW-1 1 in 1991 Modified ground water pump and treat began operation on November 24, 1992 SVE began operation on September 22, 1993 Extensive private water supply sampling program began in Over 250 private wells sampled. 175 carbon filters offered

10 Nor-Lake: Pump and Treatment System Modifications Refined pumping of RW-1 1 based on well testing completed in 1991 Added second recovery well to increase capture and remediation

11 Nor-Lake: Tower Construction Complete with Treatment Building

12 Nor-Lake: Treatment Tower With Packing Material

13 Nor-Lake: Installation of Soil Vapor Extraction (SVE) System Extensive soils investigation beneath plant and former drain field Vapor extraction system pilot testing Design and construction of a 12-vent well system Start-up in September 1993

14 Nor-Lake: Schematic of SVE System

15 2-tank Carbon Filtration System 2-tank system, first tested from 1988 to 1990 on 13 water supplies Currently, 173 water supplies are treated Changed and sampled annually for VOCs and bacteria

16 Historic Ground Water Contours Inferred fault identified by seismic data (1992). Potentially the eastern side of Hudson-Afton Horst also known as the Hasting-Lake Owen Fault.

17 Nor-Lake Pre-remediation remediation VOC Plume Inferred fault identified by seismic data (1992). Potentially the eastern side of Hudson-Afton Horst also known as the Hasting-Lake Owen Fault. Ground water contour based on 1998 Annual Report >100 ug/l TCE >50 ug/l TCE >1 ug/l TCE

18 2008 VOC Plume

19 Remediation Success- MW-6 (600 ft away) A 99.1% reduction of TCE from a pre- remediation high of 2,400 ug/l in 1992 TCE Concentration (ug/l Groundwater pump and treat system start-up November 1992 TCE MW-6 TCE values vs. Time SVE system start-up September 1993 Remediation systems temporarily shut down August 2005 Remediation systems re-started March /18/ /14/1984 8/11/1987 5/7/1990 1/31/ /28/1995 7/24/1998 4/19/2001 1/14/ /10/2006 7/6/2009 Date

20 Remediation Success- MW-9 (5,000 ft away) A 97.3% reduction of TCE from a pre- remediation high concentration of 71 ug/l TCE in 1989 Concentration (ug/l) TCE Groundwater pump and treat system start-up November 1992 MW-9 TCE values vs. Time SVE system start-up September /14/1984 8/11/1987 5/7/1990 1/31/ /28/1995 7/24/1998 4/19/2001 1/14/ /10/2006 7/6/2009 Date Remediation systems temporarily shut-down August 2004 Remediation systems re-started March 2007

21 Remediation Success- Water Supply Wells

22 Remediation Success- Daily Road Area A 97.9% reduction from a pre- remediation high concentration of 100 ug/l TCE in 1986 Concentration (ug/l) TCE Daily Road Area TCE values vs. Time 0 2/18/82 11/14/84 8/11/87 5/7/90 1/31/93 10/28/95 7/24/98 4/19/01 1/14/04 10/10/06 7/6/09 Date

23 Remediation Success- Wert Road Area A 93.2% reduction from a pre-remediation remediation high concentration of 44 ug/l TCE in 1991 Concentration (ug/l) TCE Wert Road Area TCE values vs. Time 0 5/7/90 1/31/93 10/28/95 7/24/98 4/19/01 1/14/04 10/10/06 7/6/09 Date

24 Remediation Success- Sherman Road Area A 83.8% reduction from a pre- remediation high concentration of 3.9 ug/l TCE in 1991 Concentration (ug/l) TCE Sherman Road Area TCE values vs. Time 0 2/18/82 11/14/84 8/11/87 5/7/90 1/31/93 10/28/95 7/24/98 4/19/01 1/14/04 10/10/06 7/6/09 Date

25 Pump and Treat Performance

26 SVE Performance VOC Emissions (Pounds/Hours) Cumulative Hours of Operation

27 Proposed Ground Water Management (Phase 1)

28 Ground Water Management (Phase 1) Reduction in Area of Concern Reductions of monitoring frequency Reductions of monitoring points Reductions of filter systems Continuation of both ground water pump and treat and SVE systems Continuation of monitoring well sampling Additional sampling of select water supply sentry wells

29 Ground Water Management (Phase 1): No Changes Continue operation of ground water pump and treatment system Continue operation of SVE treatment system Continue collection of ground water samples from ground water monitoring well network

30 Ground Water Management (Phase 1): Proposed Changes Addition of sentry water supply wells to monitoring network Removal of approximately 60 carbon filtration systems- will be sampled annually for 2-years2 Criteria for removal of filter: Current TCE concentration less than 0.5 ug/l The average of last four TCE concentrations less than 0.5 ug/l Discontinuation of sampling for approximately 90 water supply wells To occur within 90-days of Nor-Lake/WDNR signed agreement

31 Beyond 2009: Proposed Phase 1 to continue for two years with a review by WDNR after one year Phase 2 to be proposed after one year review Phase 2 may include removal of more filtration units and further sample reductions Future notification of filter removals and/or sampling changes will be sent in a letter to those residences that apply

32 Contacts for Questions Wisconsin Department of Natural Resources: Patrick Collins ext. 117 Wisconsin Department of Health: Henry Nehls-Lowe Ayres Associates on behalf of Nor-Lake: Lori Rosemore

33 Thank You! Questions?