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


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


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


GW

Flow

GW

Flow

PerchloratePerchlorate

Non-DetectNon-Detect


GW

Flow

GW

Flow


>4 >4 g/L <6 g/L <6 g/Lg/L


GW

Flow

GW

Flow


>6 >6 g/Lg/L


GW

Flow

GW

Flow

All PerchlorateAll Perchlorate

ResultsResults


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


Evaluate Existing Data

Acquire New Data

Chemistry

Geology

Hydrogeology

Identify Limitations

CHARACTERIZATION

Detailed Logging of Soil CoreDetailed Logging of Soil Core


Near In-Situ ConditionsNear 100% RecoveryPlastic Wrapping Allows for LabelingBoxed for Long-Term Storage

Soil Core Soil Core Benefits:Benefits:

Depth-Discrete Slug TestingDepth-Discrete Slug Testing


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


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)




Pneumatic (PZ-02-315)

Pneumatic (PZ-03-325)

Slug Test ResultsSlug Test Results

Shallow

Intermediate

Deep

Installing Multi-LevelInstalling Multi-LevelMonitoring WellsMonitoring Wells


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


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


CMT Installation: Step 1Layout Work Area


CMT Installation: Step 2Prepare 300-Foot CMT Coil


CMT Installation: Step 3Uncoil CMT Material


CMT Installation: Step 4Install Monitoring Ports


CMT Installation: Step 5Install Port Screens


CMT Installation: Step 6Backfill Void Space


CMT Installation: Step 7Install Bottom Plugs


CMT Wellhead

SevenMonitoring

Ports

ProtectivePVC Sleeve

SandDrainage


PVC Couplet Wellhead (in progress)


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


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


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


Cross-Section and Groundwater ElevationsCross-Section and Groundwater Elevations

Northern HalfNorthern Half


Cross-Section and Groundwater ElevationsCross-Section and Groundwater Elevations

Southern HalfSouthern Half


Offsite Offsite PerchloratePerchlorate

Shallow AquiferShallow Aquifer



Intermediate Intermediate AquiferAquifer



Deep AquiferDeep Aquifer


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

[email protected]

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

presented by michael taraszki, pg, chg engineering and consulting, inc. perchlorate monitoring in...

Documents

drill string mp

pneumatic pz

perchlorate monitoring

site investigation

situ conditionsnear

morgan hill site

chemical signatures

michael taraszki