_.' (J \J 14

NORTH WELL FIELD ANALYSISDECEMBER 6, 1994

PRESENTATION

eder associatesenvironmental scientists and engineers

eder associates

EAU CLAIRE, WISCONSIN

NORTH WELL FIELD ANALYSISDECEMBER 6, 1994

PRESENTATION

PROJECT #497-08DECEMBER 1994

Office Location: Office Contact:EDER ASSOCIATES William M. Warren201 South Main Street (313) 663-2144

Ann Arbor, Michigan 48104

Offices in New York, Wisconsin, Michigan, Georgia, Florida, and New Jersey

eder associates

TABLE OF CONTENTS

Page No.TCA and TCE Graphs for Wells 11, 15, 16, and 17 1-8

VOC Graph for Well 19 9

• Computer Model Output showing Capture Zone ofWell 19 (one, five, and 20 year simulations) 10-12

• Statistical Predictions of TCE and TCA Concentrationsin Wells 11, 15, 16, and 17 13

North Well Field Data 14

• Water Treatment Plant Process Diagram 15

• Cross Section of Packed Tower 16

• Air Stripper Operation 17-18

• Results of Air Stripper Capacity Analysis 19

• Conclusions 20

497-01.002 . 12/5/94

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WELLS NO.10, 11, 15,16, 17, 19,

STRIPPINGTOWER

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CLEARWELL

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WASHWATERTANK

HIGHSERVICEPUMPS

EAU CLARE WATER TREATMENT PLANTPROCESS ALTERNATIVE: EXJSTWGPOTASSIUM PERMANGANATE OXDATION

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STACK SAMPLING PORT

ACID/HYPOCHLORITEWASH FEED INLET

RAW WATER INLET

DIFFERENTIAL PRESSUREGAUGE

ACID/HYPOCHLORITEADDITION INLET

MIST ELIMINATOR

INLET DISTRIBUTION HEADER

WEIR-TROUGH DISTRIBUTOR

BED LIMITER

PACKING SUPPORT

48" WIDE X 36" HIGH AIR INLET

HIGH LEVEL SWITCH

PRESSURE TRANSDUCER

TOWER EFFLUENT PIPEVESSEL I.D.

FIGURE 3-1CROSS SECTION OF PACKED TOWERSCITY OF EAU CLAIRE

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Bi

ower Dimensions

Packjn-.;

Tower C.

Area =

Volume

crating Conditions

Case (1

Water F

Air Faw

Air/Wa-

Case(2

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Tempera-

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/OC RawW

-DCE

-DCA

EAU CLAIRE WELL FIELD

AIR STRIPPING ANALYSIS

26 ft

= 12 ft

Current Conditions

0 gpm (521 cfm) or ( 5.616 Mgd Each )

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3.6

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gpm (668 cfm) or (7.200Mgd Each)

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Date Effluent Detection Limit(ppb) (ppb)

3/1/94 ND

4/11/94 ND

8/5/94 ND

8/5/94 ND

0.3 AWR

0.2 A/WR

0.3 A/WR

0.2 A/WR

Case(1)

5.62 MgdND

21.7

172.3

103.7

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7.20 MgdND

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182.4

114.1

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-19-

. " eder associates

CONCLUSIONSEau Claire Municipal Well Field

• In 1994, VOCs in Wells 11, 15, 16, and 17 showedsignificant decreases caused by the plume blocking effect ofpumping Well 19. VOCs are not detected in Well 10.

• VOCs are consistently below MCLs in the air stripper| influent (Wells 10, 11, 15, 16, 17, and 19). Therefore, the

air stripper currently provides a fail-safe only.

| • After 5 years of pumping Well 19 continuously, VOCs in. Wells 11, 15, 16, and 17 will be non-detect and will not

require air stripping.I•^ • After 5 years, air stripping will only be needed for well 19,. which would only require one of the two stripping towers.

I • The air stripper can treat more than 10,000 gpm (14.4 mgd)• at the current VOC concentrations, which would permit the. addition of wells in any area of the plume to meet future

demands.I• 497-OS002 -20- IJ/S/94