December 2008 Informational December 2008 Informational Meeting Regarding the Status of Meeting Regarding the Status of Ground Water Cleanup Activities Ground Water Cleanup Activities Undertaken by Nor- -Lake, Inc. Lake, Inc. Undertaken by Nor
Welcome! Welcome! Site Investigation and Site Investigation and Remediation Activities Update Remediation Activities Update Chuck Dullea, President, Nor- -Lake, Inc. Lake, Inc. Chuck Dullea, President, Nor James A. Anklam, PE, Ayres Associates James A. Anklam, PE, Ayres Associates Lori A. Rosemore, PG, Ayres Associates Lori A. Rosemore, PG, Ayres Associates
History of Ground Water History of Ground Water Investigation and Remediation Investigation and Remediation Activities in the Town of Hudson Activities in the Town of Hudson � Junker Landfill Investigation and Junker Landfill Investigation and � Remediation Remediation � Town of Warren TCE Investigation and Town of Warren TCE Investigation and � Remediation Remediation � Nor Nor- -Lake Investigation and Remediation Lake Investigation and Remediation �
Junker Landfill Investigation and Junker Landfill Investigation and Remediation Remediation � Located approximately 3.5 miles east of Daily Road Located approximately 3.5 miles east of Daily Road � � The landfill operated for approximately 16 years The landfill operated for approximately 16 years � � The landfill was closed and capped in the late The landfill was closed and capped in the late � 1980’ ’s s 1980 � The remediation system on site is an active landfill The remediation system on site is an active landfill � gas system and leachate leachate collection system collection system gas system and � Has documented ground water contamination Has documented ground water contamination � extending from the landfill westward extending from the landfill westward � Potentially co Potentially co- -mingles with the Nor mingles with the Nor- -Lake plume and Lake plume and � continues westward continues westward � Residential water supplies within the Junker Residential water supplies within the Junker’ ’s Area s Area � of Concern all have carbon filter systems paid for by of Concern all have carbon filter systems paid for by the Junker’ ’s Landfill Trust s Landfill Trust the Junker
Town of Warren TCE Investigation Town of Warren TCE Investigation and Remediation and Remediation � Located approximately 4.5 miles east of Daily Road Located approximately 4.5 miles east of Daily Road � � Discovered in 1999 Discovered in 1999 � � Investigation activities occurred in 2000, no soil Investigation activities occurred in 2000, no soil � contamination contamination � Remediation of ground water by injection of sodium Remediation of ground water by injection of sodium � permanganate permanganate � Ground water contamination extending from 80 Ground water contamination extending from 80 th th � Avenue west/northwest Avenue west/northwest � Potentially co Potentially co- -mingles with the Junker mingles with the Junker’ ’s plume and s plume and � continues westward continues westward � Residential water supplies can have carbon filter Residential water supplies can have carbon filter � systems if residents pay for them systems if residents pay for them
Nor- -Lake Investigation Lake Investigation Nor and Remediation and Remediation � Located approximately 1 mile east of Daily Road Located approximately 1 mile east of Daily Road � � Discovered in the mid 1980 Discovered in the mid 1980’ ’s s � � Documented soil contamination and elevated levels Documented soil contamination and elevated levels � of trichloroethene (TCE) and other compounds in of trichloroethene (TCE) and other compounds in groundwater groundwater � Investigation activities occurred in late 1980 Investigation activities occurred in late 1980’ ’s until s until � mid 1990’ ’s s mid 1990 � Ground water contamination extends from Co. Rd. Ground water contamination extends from Co. Rd. � U west/northwest U west/northwest � Active ground water and soil remediation systems Active ground water and soil remediation systems � � Residential water supplies that qualify have carbon Residential water supplies that qualify have carbon � filter systems provided by Nor- -Lake, Inc. Lake, Inc. filter systems provided by Nor
Special Well Construction Areas Special Well Construction Areas
Nor- -Lake: Site Investigation Lake: Site Investigation Nor � 30 monitoring wells 30 monitoring wells � � Over 250 private wells Over 250 private wells � � Volatile Organic Compounds (VOCs) Volatile Organic Compounds (VOCs) � primary compound is trichloroethene primary compound is trichloroethene (TCE) (TCE)
Nor- -Lake: Remediation Lake: Remediation Nor � Pump and treat began 1986 Pump and treat began 1986 � � Well testing completed on RW Well testing completed on RW- -1 in 1991 1 in 1991 � � Modified ground water pump and treat Modified ground water pump and treat � began operation on November 24, 1992 began operation on November 24, 1992 � SVE began operation on September 22, 1993 SVE began operation on September 22, 1993 � � Extensive private water supply sampling Extensive private water supply sampling � program began in 1995. Over 250 private program began in 1995. Over 250 private wells sampled. 175 carbon filters offered wells sampled. 175 carbon filters offered
Nor- -Lake: Pump and Lake: Pump and Nor Treatment Treatment System Modifications System Modifications � Refined pumping of RW Refined pumping of RW- -1 based on well 1 based on well � testing completed in 1991 testing completed in 1991 � Added second recovery well to increase Added second recovery well to increase � capture and remediation capture and remediation
Nor- -Lake: Tower Construction Lake: Tower Construction Nor Complete with Treatment Complete with Treatment Building Building
Nor- -Lake: Treatment Tower Lake: Treatment Tower Nor With Packing Material With Packing Material
Nor- -Lake: Installation of Soil Lake: Installation of Soil Nor Vapor Extraction (SVE) System Vapor Extraction (SVE) System � Extensive soils investigation beneath Extensive soils investigation beneath � plant and former drain field plant and former drain field � Vapor extraction system pilot testing Vapor extraction system pilot testing � � Design and construction of a 12 Design and construction of a 12- -vent vent � well system well system � Start Start- -up in September 1993 up in September 1993 �
Nor- -Lake: Schematic of SVE Lake: Schematic of SVE Nor System System
2- -tank Carbon Filtration System tank Carbon Filtration System 2 � 2 2- -tank system, first tank system, first � tested from 1988 to tested from 1988 to 1990 on 13 water 1990 on 13 water supplies supplies � Currently, 173 water Currently, 173 water � supplies are treated supplies are treated � Changed and Changed and � sampled annually for sampled annually for VOCs and bacteria VOCs and bacteria
Historic Ground Water Contours 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.
Nor- -Lake Pre Lake Pre- -remediation remediation Nor VOC Plume VOC Plume Inferred fault identified by seismic data (1992). Ground water Potentially the eastern contour based on 1998 Annual Report side of Hudson-Afton >100 ug/l TCE Horst also known as the >50 ug/L TCE Hasting-Lake Owen Fault. >1 ug/L TCE
2008 VOC Plume 2008 VOC Plume
Remediation Success- - MW MW- -6 6 Remediation Success (600 ft away) (600 ft away) MW-6 � A 99.1% A 99.1% TCE values vs. Time � 3000 reduction of reduction of SVE system start-up Groundwater pump and treat September 1993 system start-up November 1992 TCE from a TCE from a 2500 pre- - pre 2000 TCE Concentration (ug/L Remediation systems temporarily shut down Remediation systems remediation August 2005 remediation re-started March 2007 1500 high of 2,400 high of 2,400 TCE 1000 ug/L in 1992 ug/L in 1992 500 0 2/18/1982 11/14/1984 8/11/1987 5/7/1990 1/31/1993 10/28/1995 7/24/1998 4/19/2001 1/14/2004 10/10/2006 7/6/2009 Date
Remediation Success- - MW MW- -9 9 Remediation Success (5,000 ft away) (5,000 ft away) MW-9 TCE values vs. Time � A 97.3% A 97.3% � 80 Groundwater pump and treat SVE system start-up system start-up November 1992 September 1993 Remediation systems reduction of reduction of re-started March 2007 70 Remediation systems temporarily shut-down August 2004 TCE from a pre- - TCE from a pre 60 Concentration (ug/L) 50 remediation remediation 40 high high 30 concentration concentration 20 TCE of 71 ug/L TCE of 71 ug/L TCE 10 in 1989 in 1989 0 11/14/1984 8/11/1987 5/7/1990 1/31/1993 10/28/1995 7/24/1998 4/19/2001 1/14/2004 10/10/2006 7/6/2009 Date
Remediation Success- - Water Water Remediation Success Supply Wells Supply Wells
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