TITLE 77: PUBLIC HEALTH
CHAPTER I: DEPARTMENT OF PUBLIC HEALTH
SUBCHAPTER r: WATER AND SEWAGE
PART 905 PRIVATE SEWAGE DISPOSAL CODE
SECTION 905.APPENDIX A ILLUSTRATIONS AND EXHIBITS



Section 905.APPENDIX A Illustrations and Exhibits

 

Section 905.ILLUSTRATION H Subsurface Seepage System Size Determination

 

Section 905.EXHIBIT A Gravel System

 

Time (minutes) required for last 6 inches of water to fall

FOR RESIDENTIAL USE Required Absorption Area (sq ft)/bedroom)

FOR INSTITUTIONAL OR COMMERCIAL USE Allowable application rate (GPD/sq ft) (5)

Recommended depth from bottom of the trench to the limiting layer

18 - 60

200

1.0

 

90

210

.95

3 feet

120

235

.85

 

150

265

.75

 

180

290

.69

 

240

320

.62

 

300

350

.57

2 feet

360

385

.52

 

NOTE:

1.

Absorption area is figured as trench bottom area in absorption trenches and bottom area in seepage beds.

2.

Seepage beds require 1 times the seepage field absorption area specified.

3.

Over 360 is unsuitable for subsurface seepage systems.

4.

Under 18 is unsuitable for subsurface seepage systems.

5.

Divide the required total gallons per day by this number to get the number of square feet required

 

(Source: Amended at 20 Ill. Reg. 2431, effective March 15, 1996)


Section 905.APPENDIX A Illustrations and Exhibits

 

Section 905.ILLUSTRATION H Subsurface Seepage System Size Determination

 

Section 905.EXHIBIT B Gravelless System

 

Time (minutes) required for last 6 inches of water to fall

FOR RESIDENTIAL USE Required Absorption Area (sq ft)/bedroom)

FOR INSTITUTIONAL OR COMMERCIAL USE Allowable application rate (GPD/sq ft) (5)

Recommended depth from bottom of the trench to the limiting layer

 

8 inch

10 inch

8 inch

10 inch

 

18 60

100

70

2.00

3.00

 

90

105

70

1.90

2.86

3 feet

120

120

80

1.66

2.50

 

150

135

90

1.48

2.22

 

180

145

100

1.38

2.00

 

240

160

110

1.25

1.82

 

300

175

120

1.14

1.66

2 feet

360

195

130

1.0

1.54

 

NOTE:

1.

Over 360 is unsuitable for subsurface seepage systems.

2.

Under 18 is unsuitable for subsurface seepage systems.

3.

Divide the required total gallons per day by this number to get the number of lineal feet required.

 

(Source: Amended at 20 Ill. Reg. 2431, effective March 15, 1996)