Presented by Michael Taraszki, PG, CHG Engineering and Consulting, Inc. Perchlorate Monitoring in...
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Transcript of Presented by Michael Taraszki, PG, CHG Engineering and Consulting, Inc. Perchlorate Monitoring in...
Presented byMichael Taraszki, PG, CHG
Engineering and Consulting, Inc.
Perchlorate Monitoring in the Perchlorate Monitoring in the Llagas Groundwater SubbasinLlagas Groundwater Subbasin
South Santa Clara County, CaliforniaSouth Santa Clara County, California
Olin/Standard Fusee Case StudyOlin/Standard Fusee Case Study
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
OutlineOutline
Investigation HistoryInvestigation History
Current Cleanup and Abatement Current Cleanup and Abatement Order (CAO)Order (CAO)
Characterization Elements and Characterization Elements and ChallengesChallenges
Status of InvestigationStatus of Investigation
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Investigation HistoryInvestigation HistoryPerchlorate Tested/Observed Beneath Perchlorate Tested/Observed Beneath Morgan Hill Site in 2000Morgan Hill Site in 2000
Site Investigation Expanded to Include Site Investigation Expanded to Include Offsite Private WellsOffsite Private Wells
Continued Presence of Perchlorate Required Continued Presence of Perchlorate Required Rapid Expansion of Monitoring ProgramRapid Expansion of Monitoring Program
Over 200 Wells >PHG (6 Over 200 Wells >PHG (6 g/L) by 2004g/L) by 2004
Only 33 Wells >PHG CurrentlyOnly 33 Wells >PHG Currently
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
SITE
SAN
TA C
RUZ M
OU
NTA
INS
DIA
BLO
RA
NG
E
LLAGASSUBBASIN
COYOTESUBBASIN
GROUNDWATERDIVIDE
REVISED DATE
FIGURE
JOB NUMBERDRAWN APPROVED DATE
1TJH
Fourth Quarter 2005 Groundwater Monitoring ReportOlin/Standard Fusee SiteMorgan Hill, California
Site Location Map
6300050009 01 1/2006
Fig
ure
1-S
ite-l
oca
tion
-ma
p.m
xd -
1/5
/06
2 0 21
Miles
Source: TOPO!, 2000
SANTA CLARA COUNTY
SITE
PACIFICOCEAN
LOCATION MAP
CHECKED
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
GW
Flow
GW
Flow
PerchloratePerchlorate
Non-DetectNon-Detect
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
GW
Flow
GW
Flow
PerchloratePerchlorate
>4 >4 g/L <6 g/L <6 g/Lg/L
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
GW
Flow
GW
Flow
PerchloratePerchlorate
>6 >6 g/Lg/L
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
GW
Flow
GW
Flow
All PerchlorateAll Perchlorate
ResultsResults
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Investigation OverviewInvestigation Overview
Current Cleanup and Abatement Order RequirementsCurrent Cleanup and Abatement Order Requirements
Characterization ElementsCharacterization Elements– Lateral/Vertical Extent of PerchlorateLateral/Vertical Extent of Perchlorate– Background Concentration EvaluationBackground Concentration Evaluation– Establish GW Flow Directions, Chemical Signatures, and Establish GW Flow Directions, Chemical Signatures, and
Aquifer Hydraulic ParametersAquifer Hydraulic Parameters
Characterization ChallengesCharacterization Challenges– Large Scale ProjectLarge Scale Project– Significant Technical IssuesSignificant Technical Issues– Aggressive ScheduleAggressive Schedule– Politically Charged ArenaPolitically Charged Arena
Investigation StatusInvestigation Status
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Evaluate Existing Data
Acquire New Data
Chemistry
Geology
Hydrogeology
Identify Limitations
CHARACTERIZATION
Detailed Logging of Soil CoreDetailed Logging of Soil Core
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Near In-Situ ConditionsNear 100% RecoveryPlastic Wrapping Allows for LabelingBoxed for Long-Term Storage
Soil Core Soil Core Benefits:Benefits:
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Depth-Discrete Slug TestingDepth-Discrete Slug Testing
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Aquifer Hydraulic TestingAquifer Hydraulic Testing
In-Situ Drill-String Slug TestingIn-Situ Drill-String Slug Testing– Conducted During Drilling ActivitiesConducted During Drilling Activities– 208 Tests Performed to Date208 Tests Performed to Date
Pneumatic Slug TestingPneumatic Slug Testing– Conducted In Completed 1-Inch PVC WellsConducted In Completed 1-Inch PVC Wells
‘‘Passive’ Pumping Response AnalysisPassive’ Pumping Response Analysis– Continuously Recorded Water LevelsContinuously Recorded Water Levels
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
0
50
100
150
200
250
300
350
400
450
500
0.1 1.0 10.0 100.0 1000.0
Hydraulic Conductivity (ft/day)
De
pth
(fe
et
bg
s)
Drill String (MP-01)
Drill String (MP-02)
Drill String (MP-03)
Drill String (MP-04)
Pneumatic (PZ-02-315)
Pneumatic (PZ-03-325)
Slug Test ResultsSlug Test Results
Shallow
Intermediate
Deep
Installing Multi-LevelInstalling Multi-LevelMonitoring WellsMonitoring Wells
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Mixture of TechniquesMixture of Techniques
0
300
400
450
100
200
Depth (ft)
Initial Borehole &PVC Couplet
Second Borehole &CMT Well
Casing
Borehole
Screen
Result: Up To Nine
Depth-Discrete Intervals at
Each Location
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Monitoring Well DesignMonitoring Well Design
Base Design Upon Geologic Log of Continuous Base Design Upon Geologic Log of Continuous CoreCore
Target Zones with Highest PermeabilityTarget Zones with Highest Permeability
CMT Well Design Begins with Evaluation of First CMT Well Design Begins with Evaluation of First 300-Feet of Primary Borehole300-Feet of Primary Borehole
PVC Couplet DesignedPVC Couplet Designed
CMT Design Confirmed with Evaluation of CMT Design Confirmed with Evaluation of Secondary BoreholeSecondary Borehole
Designs Coordinated with RWQCB and SCVWDDesigns Coordinated with RWQCB and SCVWD
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
CMT Installation: Step 1Layout Work Area
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
CMT Installation: Step 2Prepare 300-Foot CMT Coil
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
CMT Installation: Step 3Uncoil CMT Material
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
CMT Installation: Step 4Install Monitoring Ports
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
CMT Installation: Step 5Install Port Screens
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
CMT Installation: Step 6Backfill Void Space
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
CMT Installation: Step 7Install Bottom Plugs
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
CMT Wellhead
SevenMonitoring
Ports
ProtectivePVC Sleeve
SandDrainage
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
PVC Couplet Wellhead (in progress)
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Completed Well DiagramsCompleted Well Diagrams
0
300
400
450
100
200
Depth (ft)
Initial Borehole &PVC Couplet
Second Borehole &CMT Well
Casing
Borehole
Screen
Result: Up To Nine
Depth-Discrete Intervals at
Each Location
Depth-Discrete Groundwater Depth-Discrete Groundwater Elevation and Analytical DataElevation and Analytical Data
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
GW Elevation EvaluationGW Elevation Evaluation
Monitoring Well Elevation Data Will Be Monitoring Well Elevation Data Will Be Used to Identify:Used to Identify:– Vertical Distinction of Aquifer UnitsVertical Distinction of Aquifer Units
– Local Pumping InfluencesLocal Pumping Influences
– Depth-Discrete Horizontal GradientsDepth-Discrete Horizontal Gradients
– Utility of Supply WellsUtility of Supply Wells
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
0
50
100
150
200
250
300
350
400
450
230 240 250 260 270 280 290 300 310 320
Groundwater Elevation (feet MSL)
Port/
Stcr
een
Dept
h (fe
et b
gs)
MP-1/PZ-1
MP-2/PZ-2
MP-3/PZ-3
MP-4
Depths to water measured 9/15/05
Shallow Aquifer
Intermediate Aquifer
Deep Aquifer
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Cross-Section and Groundwater ElevationsCross-Section and Groundwater Elevations
Northern HalfNorthern Half
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Cross-Section and Groundwater ElevationsCross-Section and Groundwater Elevations
Southern HalfSouthern Half
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Offsite Offsite PerchloratePerchlorate
Shallow AquiferShallow Aquifer
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Offsite Offsite PerchloratePerchlorate
Intermediate Intermediate AquiferAquifer
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
Offsite Offsite PerchloratePerchlorate
Deep AquiferDeep Aquifer
NWQMC, San Jose, CA, NWQMC, San Jose, CA, May 11, 2006May 11, 2006
SummarySummaryData EvaluationData Evaluation– Continuous Soil CoreContinuous Soil Core– Groundwater Flow DirectionsGroundwater Flow Directions– Aquifer Hydraulic ParametersAquifer Hydraulic Parameters– Perchlorate Distribution/Chemical SignaturesPerchlorate Distribution/Chemical Signatures
Significant Challenges Being Addressed with Significant Challenges Being Addressed with Innovative ApproachesInnovative Approaches– Sonic Drilling/Continuous Soil CoresSonic Drilling/Continuous Soil Cores– Multi-Level Monitoring Well TechnologyMulti-Level Monitoring Well Technology– Depth-Discrete Aquifer TestingDepth-Discrete Aquifer Testing
Aggressive Investigation ScheduleAggressive Investigation Schedule
Contact Information:Contact Information:
Michael TaraszkiMichael Taraszki
600 Grand Avenue, Suite 300600 Grand Avenue, Suite 300
Oakland, California 94610Oakland, California 94610
(510) 628-3222(510) 628-3222
Petaluma Office:5341 Old Redwood Hwy, Ste 300Petaluma, CA 94954Phone: (707) 793-3800Fax: (707) 793-3900
San Francisco Office:28 Second Street, Suite 700San Francisco, CA 94105Phone: (415) 543-8422Fax: (415) 777-9706
Sacramento Office:4704 Roseville Road, Suite 108, North Highlands, CA 95660
Phone: (916) 332-5552 Fax: (916) 332-5559
www.mactec.com www.mactec.com