6595

FIGURE 4 - 1

SAMPLE LOCATIONS

DES MOINES SOUTH AREA SOURCE CONTROL PROJECT

DES MOINES. IOWA

ECKENFELDER INC.

Nashville.Tennessee Mahwoh.New Jersey Rochester.New York

1 6595

FIGURE 4 - 2

LOCATION OF GEOPHYSICAL SYRVEY TRAVERSES

DES MOINES SOUTH AREA SOURCE CONTROL PROJECT

OES MOINES. IOWA

ECKENFELDER INC.

Nashville.Tennessee Mahwoh.New Jersey Rochester.New York

6595

.S-7

S-6

- * -

S-i • S - 4 •S -S

MAINTENANCE GARAGE

10

scale

10 20

APPROX. feet

SAMPLE DEPTHS(FEET) S-1 s-2 S-3 S-4 S-5 S-6 S-7

4.3-4.8 1.5 - 2.0 1.5 - 2.0 2.0- 2.5 2.0- 2.5 2.0- 2.5 2.0- 2.5

LEGEND; A S - I SHALLOW AUGER BORING • LOCATION

FIGURE 4-3 LOCATIONS OF SHALLOW

BORINGS IN VICINITY OF THE FORMER

ALDRIN MIXING TANK DES MOINES SOUTH AREA

SOURCE CONTROL PROJECT

ECKENFELDER INC.

N:i.sl«vilk','l«-um*!«iv Maliwali,Ni-wJiTK7

6595

"T^^^e^^m

LOCKABLE MOTECTIVE CASING

SANO PACK-

f y

OONCKETE

r ^ 2 ^

EXISTING fflOUNO BURmCE

7»^5»?55?^Sf^fr

• 'M IN IMUM KMEHOLE OIA.

2" PVC PIPE

NEAT C E M E N T / K N T O N I T E M O U T

2 ' BENTONITE PELLET SEAL

—MINIMUM t '

-2 PVC,0.020" SLOTTED WELL SCREEN NOMINAL LENGTH: 10 FEET

SHALE BEDROCK SURACE

FIGURE 4 - 4

TYPICAL BEDROCK MONITORING WELL CONSTRUCTION DETAIL

DES MOINES SOUTH AREA SOURCE CONTROL PROJECT

E C K E N F E L D E R Na.hviIIc.Tenne«ce J J S ^ Mjhwih.NcwJerwy

6595

O H A - 3 O H A - 2 O H A - I

HA-5O X DB-12 O H A - 4

O H A - 6

/ . / / / / / /

LEGENDt OB-12

H A - 2 ,

DEEP AUGER BORING

SHALLOW AUGER BORING

10

scale

10 20

APPROX. feet

FIGURE 4-5

LOCATIONS OF SURFICIAL SOIL SAMPLES COLLECTED FOR

ANALYSIS OF CHROMIUM

DES MOINES SOUTH AREA SOURCE CONTROL PROJECT

ECKENFELDER ING

Nashville.Tennessee Mahwah, New Jersey