The Red River flows along and around a por­

tion of the site for the excavation, the deeper parts of the river in the vicinity of the excavation range from approximately elevation 10.0 to -20.0 feet. To what extent the channel of the river provides an open source of seepage into the underlying deep sand formation is not known; the logs of a few borings made in the bed and along the bank of the river are shown in the pre­viously referenced report by____________________ It will be

the responsibility of the Contractor to make his or her own evaluation of the effect of the Red River on dewa­tering and control of seepage into the excavation, not otherwise covered by these specifications.

(d) Chemical analyses of sample of groundwater taken from Test Wells A, B, and C on 28 April 1 8 gave the following results:

Well A

Total

13 7-ft

depth

260-ft

depth

Well B

Well C

pH

6.8

7.0

7.0

6.9

Chloride (Cl)

115

30

60

110

Suspended Solids (ppm)

52

34

62

37

Volatile Solids (ppm)

8

5.5

7

5

Total Solids (ppm) Total Dissolved Solids

520

762

977

1620

(ppm)

Total Volatile Solids

468

728

915

1583

(ppm)

50

65

88

227

Sulfate (ppm)

7

9

539

202

Hardness (СаСО,) (ppm)

390

423

694

1066

Magnesium

26

28

54

94

G-ll

Well A

Total

137-ft

depth

260-ft

depth

Well B

Well t

Manganese

2

2

1

1

Calcium (ppm)

105

95

165

244

Iron (total) (ppm)

8

19

13

9

Hydrogen Sulfide (ppm)

<0.1

<0.1

<0.1

<0.1

Total Alkalinity

(CaC03) (ppm)

405

479

567

480

Carbon Dioxide

(C02) (ppm)

120

95

120

110