gas plant. env o ment prob em - · pdf filekomex international ltd. ......

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Komex International Ltd.Environmental and Engineering Consultants

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M. Brewster1, S.Penny1, B.Odell1, andT. Jorgensen-Nelson2

1 Komex International Ltd.

2 Confidential Employer

M. BrewsterM. Brewster11, S.Penny, S.Penny11, B.Odell, B.Odell11, and, andT. Jorgensen-NelsonT. Jorgensen-Nelson22

11 Komex International Ltd. Komex International Ltd.

22 Confidential Employer Confidential Employer

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➾ Hydrocarbon free product was detected in LiquefiedPetroleum Gases (LPG) Recovery Area at an Albertagas plant.

➾ Approximate area of 3,100 m2 with hydrocarbon freeproduct on water table.

➾➾ Hydrocarbon free product was detected in LiquefiedHydrocarbon free product was detected in LiquefiedPetroleum Gases (LPG) Recovery Area at an AlbertaPetroleum Gases (LPG) Recovery Area at an Albertagas plant.gas plant.

➾➾ Approximate area of 3,100 mApproximate area of 3,100 m22 with hydrocarbon free with hydrocarbon freeproduct on water table.product on water table.

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LEGEND:

98-2

4C

98-2

4B

98-2

4A

LPG STORAGE TANKS(87,000 GAL. EACH) 0 10 20m

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➾ Plume located within the process area and straddlestwo hydrogeological units.

➾➾ Plume located within the process area and straddlesPlume located within the process area and straddlestwo hydrogeological units.two hydrogeological units.

TILL K< 1x10 m/s

GRAVEL FILL K~ 1x10 m/s

BEDROCK (SILTSTONE)

?-7

?

C

WATER TABLE

LEAN OILFREE PRODUCT PLUME

DISSOLVED PHASE GROUNDWATER CONTAMINANT PLUME

TILLK< 1x10 m/s-7

0 10 20m

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➾ Source area beneath the process facilities consists ofgranular fill. (K = 10-5 m/s)

➾ Approximately 10 m downgradient gravel thins out tonative till. (K = 10-8 m/s)

➾ Groundwater surface located approximately 1.5 mbgsin the fill and 0.5 mbgs in the till.

➾➾ Source area beneath the process facilities consists ofSource area beneath the process facilities consists ofgranular fill. (K = 10granular fill. (K = 10-5-5 m/s) m/s)

➾➾ Approximately 10 m downgradient gravel thins out toApproximately 10 m downgradient gravel thins out tonative till. (K = 10native till. (K = 10-8-8 m/s) m/s)

➾➾ Groundwater surface located approximately 1.5 mbgsGroundwater surface located approximately 1.5 mbgsin the fill and 0.5 mbgs in the till.in the fill and 0.5 mbgs in the till.

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➾ No disturbance toinfrastructure/operations

➾ Containment of free product and dissolvedphase plumes

➾ Recovery of free product (reduce seepage)

➾➾ No disturbance toNo disturbance toinfrastructure/operationsinfrastructure/operations

➾➾ Containment of free product and dissolvedContainment of free product and dissolvedphase plumesphase plumes

➾➾ Recovery of free product (reduce seepage)Recovery of free product (reduce seepage)

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➾ Excavation and ex-situ treatment

➾ Soil vapour extraction

➾ Multi-phase extraction

➾ Product skimming

➾ Dual phase pumping

➾ Trench and gate cutoff system

➾➾ Excavation and ex-situ treatmentExcavation and ex-situ treatment

➾➾ Soil vapour extractionSoil vapour extraction

➾➾ Multi-phase extractionMulti-phase extraction

➾➾ Product skimmingProduct skimming

➾➾ Dual phase pumpingDual phase pumping

➾➾ Trench and gate cutoff systemTrench and gate cutoff system

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Phased in-situ approach selected:

Phase I: installation of a hydrocarbon recovery trench withinthe core of the plume (Installed in 1999)

Phase II: Installation of Trench and Gate System atthe downgradient edge of the plume (Installed in2000)

Phase III: Installation of additional recovery wells in gravel fillsection (in progress)

Phased in-situ approach selected:Phased in-situ approach selected:

Phase I: installation of a hydrocarbon recovery trench withinPhase I: installation of a hydrocarbon recovery trench withinthe core of the plume (Installed in 1999)the core of the plume (Installed in 1999)

Phase II: Installation of Trench and Gate System atPhase II: Installation of Trench and Gate System atthe downgradient edge of the plume (Installed inthe downgradient edge of the plume (Installed in2000)2000)

Phase III: Installation of additional recovery wells in gravel fillPhase III: Installation of additional recovery wells in gravel fillsection (in progress)section (in progress)

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➾ A permeable �V� shaped trench directinggroundwater flow to the �gate�

➾ A free product separation gate

➾ A dissolved phase treatment gate

➾ A post-treatment re-infiltration gallery

➾➾ A permeable �V� shaped trench directingA permeable �V� shaped trench directinggroundwater flow to the �gate�groundwater flow to the �gate�

➾➾ A free product separation gateA free product separation gate

➾➾ A dissolved phase treatment gateA dissolved phase treatment gate

➾➾ A post-treatment re-infiltration galleryA post-treatment re-infiltration gallery

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Weeping Tile

Water Table

CROSS-SECTION

Collection Trench

PLAN VIEW

Treatment Gate

Gravel Backfill

Backfill/Bentonite

ContaminantPlume

Gravel BackfillSeparation Gate

Reinfiltration Gallery

Cross- Section

Impermeable Trench Wall

Flow Direction

Contaminant Plume

Ground Surface

Impermeable Liner (Trench Wall)

Flow Direction

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PERFORATED/SCREENED INTERVAL

FREE PRODUCT LAYER

FREE PRODUCT REMOVAL

GROUND LEVEL

WATER TABLE

TO RE-INFILTRATION GALLERY

FREE PRODUCTSEPARATOR

AERATIONTANK

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-24C

98-2

4B

98-2

4A

LEGEND:

LPG STORAGE TANKS(87,000 GAL. EACH)

TRENCH AND GATE SYSTEMPRODUCT SEPARATION GATE

TREATMENT GATERE-INFILTRATION GALLERY

0 10 20m

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Excavation of Collection Trench Installation of Separation Gate

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GGGGaaaalllllllleeeerrrryyyyGGGGaaaalllllllleeeerrrryyyy

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GGGGaaaatttteeee

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GGGGaaaatttteeeeGGGGaaaatttteeee

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IIIInnnnssssttttaaaalllllllliiiinnnngggg CCCCoooonnnnnnnneeeeccccttttoooorrrr PPPPiiiippppeeeeIIIInnnnssssttttaaaalllllllliiiinnnngggg CCCCoooonnnnnnnneeeeccccttttoooorrrr PPPPiiiippppeeeeIIIInnnnssssttttaaaalllllllliiiinnnngggg CCCCoooonnnnnnnneeeeccccttttoooorrrr PPPPiiiippppeeee

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➾ System was constructed in Fall 2000.

➾ Has been operating since Spring 2001.

➾ System was designed to operate continuously for 12months per year.

➾➾ System was constructed in Fall 2000.System was constructed in Fall 2000.

➾➾ Has been operating since Spring 2001.Has been operating since Spring 2001.

➾➾ System was designed to operate continuously for 12System was designed to operate continuously for 12months per year.months per year.

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Evaluated via the following metrics:

➾ product recovery volumes in the product separationgate; and.

➾ groundwater quality before and after treatment in thedissolved phase treatment gate.

Evaluated via the following metrics:Evaluated via the following metrics:

➾➾ product recovery volumes in the product separationproduct recovery volumes in the product separationgate; and.gate; and.

➾➾ groundwater quality before and after treatment in thegroundwater quality before and after treatment in thedissolved phase treatment gate.dissolved phase treatment gate.

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➾ To date, there has been no significant entry of freeproduct in the Separation Gate.

➾ A fairly continuous hydrocarbon sheen is observed inthe gate.

➾➾ To date, there has been no significant entry of freeTo date, there has been no significant entry of freeproduct in the Separation Gate.product in the Separation Gate.

➾➾ A fairly continuous hydrocarbon sheen is observed inA fairly continuous hydrocarbon sheen is observed inthe gate.the gate.

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PPPPllllaaaannnn VVVViiiieeeewwww ooooffff TTTTrrrreeeennnncccchhhh aaaannnndddd GGGGaaaatttteeeePPPPllllaaaannnn VVVViiiieeeewwww ooooffff TTTTrrrreeeennnncccchhhh aaaannnndddd GGGGaaaatttteeeePPPPllllaaaannnn VVVViiiieeeewwww ooooffff TTTTrrrreeeennnncccchhhh aaaannnndddd GGGGaaaatttteeee98

-24C

98-2

4B

98-2

4A

LEGEND:

LPG STORAGE TANKS(87,000 GAL. EACH)

TRENCH AND GATE SYSTEMPRODUCT SEPARATION GATE

TREATMENT GATERE-INFILTRATION GALLERY

0 10 20m

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QQQQuuuuaaaalllliiiittttyyyy

TTTTrrrreeeennnncccchhhh aaaannnndddd GGGGaaaatttteeee SSSSyyyysssstttteeeemmmm ---- WWWWaaaatttteeeerrrrTTTTrrrreeeennnncccchhhh aaaannnndddd GGGGaaaatttteeee SSSSyyyysssstttteeeemmmm ---- WWWWaaaatttteeeerrrr

QQQQuuuuaaaalllliiiittttyyyyQQQQuuuuaaaalllliiiittttyyyyMonitoring

StationDate Benzene Toluene Ethylbenzene Xylenes TPH

(C3-C10)

CDWQG 0.005 0.024 0.0024 0.3 NC

ProductSeparation

Gate

09/24/01 0.0249 <0.0009 <0.0009 0.223 0.6

11/13/01 0.022 <0.002 <0.002 0.292 1.2

06/27/02 0.0552 0.0108 <0.0004 0.186 1.2

TreatmentGate

09/24/01 <0.0004 <0.0004 <0.0004 <0.0012 <0.1

11/13/01 <0.0004 <0.0004 <0.0004 <0.0012 <0.1

06/27/02 <0.0004 <0.0004 <0.0004 <0.0012 <0.1

MonitoringStation

Date Benzene Toluene Ethylbenzene Xylenes TPH(C3-C10)

CDWQG 0.005 0.024 0.0024 0.3 NC

ProductSeparation

Gate

09/24/01 0.0249 <0.0009 <0.0009 0.223 0.6

11/13/01 0.022 <0.002 <0.002 0.292 1.2

06/27/02 0.0552 0.0108 <0.0004 0.186 1.2

TreatmentGate

09/24/01 <0.0004 <0.0004 <0.0004 <0.0012 <0.1

11/13/01 <0.0004 <0.0004 <0.0004 <0.0012 <0.1

06/27/02 <0.0004 <0.0004 <0.0004 <0.0012 <0.1

All units in mg/L

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Achieved Remedial Goals:

➾ prevented further expansion of free product anddissolved phase plumes;

➾ treated dissolved hydrocarbons at the downgradientedge; and,

➾ system is well positioned to capture downgradientfree product migration

Achieved Remedial Goals:Achieved Remedial Goals:

➾➾ prevented further expansion of free product andprevented further expansion of free product anddissolved phase plumes;dissolved phase plumes;

➾➾ treated dissolved hydrocarbons at the downgradienttreated dissolved hydrocarbons at the downgradientedge; and,edge; and,

➾➾ system is well positioned to capture downgradientsystem is well positioned to capture downgradientfree product migrationfree product migration

gas plant. env o ment prob em - · pdf filekomex international ltd. ......

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