Ill. Admin. Code tit. 77, § 906.APPENDIX A – Illustrations and Exhibits

Section 906.ILLUSTRATION A Plan View of a Mound Utilizing Two Trenches as the Absorption Area

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.ILLUSTRATION B Cross-Section of a Mound Using Trenches for the Absorption Area

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.ILLUSTRATION C Plan View of a Mound Utilizing a Bed as the Absorption Area

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.ILLUSTRATION D Cross-Section of a Mound Using a Bed for the Absorption Area

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.ILLUSTRATION E Mound Distribution System

Mound Distribution System (continued)

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.ILLUSTRATION F Typical Pumping Chamber

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.ILLUSTRATION G Tee-To-Tee Lateral/Manifold Construction

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.ILLUSTRATION H Dosing Frequencies for Various Soil Textures

Soil Texture	Dosing Frequency

Sand	4 doses/day
Sandy loam	1 dose/day
Loam	Frequency not critical*
Silt loam; silty clay loam	1 dose/day*
Clay	Frequency not critical*

*Long-term resting provided by alternating fields may be desirable.

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.ILLUSTRATION I Maximum Manifold Length (ft) for Various Manifold Diameters Given the Lateral Discharge Rate and Lateral Spacing

Lateral Discharge Rate		Manifold Diameter – 1¼"		Manifold Diameter – 1½ "		Manifold Diameter – 2"


End Manifold	Central Manifold		Lateral Spacing (ft)		Lateral Spacing (ft)		Lateral Spacing (ft)

			2	4	6	8	10	2	4	6	8	10	2	4	6	8	10

10	5		4	8	6	11	10	10	5	6	8	10	12	16	24	24	30
20	10		4	4	6			4	4	6	8	10	4	8	12	16	20
30	15		2					2	4	6			6	8	6	8	10
40	20												4	4	6	8	10
50	25												2	4	6	8
60	30												2	4
70	35												2	4
80	40												2
90	45												2
100	50												2

Lateral Discharge Rate		Manifold Diameter – 3"		Manifold Diameter – 4 "		Manifold Diameter – 6"


End Manifold	Central Manifold		Lateral Spacing (ft)		Lateral Spacing (ft)		Lateral Spacing (ft)

			2	4	6	8	10	2	4	6	8	10	2	4	6	8	10

10	5		24	40	48	56	70	42	64	84	96	110	84	136	174	206	240
20	10		16	24	30	32	40	26	40	54	64	70	54	84	108	128	150
30	15		12	16	24	24	30	20	28	36	48	50	42	64	84	96	110
40	20		10	12	18	16	20	16	24	30	32	40	34	52	66	80	90
50	25		8	12	12	16	20	14	20	24	32	40	30	44	60	72	80
60	30		6	8	12	16	20	12	16	24	24	30	26	40	48	64	70
70	35		6	8	12	8	10	10	16	18	24	30	24	36	48	56	60
80	40		6	8	6	8	10	10	12	18	16	20	22	32	42	48	60
90	45		4	8	6	8	10	8	12	18	16	20	20	28	42	48	50
100	50		4	4	6	8	10	8	12	12	16	20	18	28	36	40	50
110	55		4	4	6	8	10	8	12	12	16	20	16	24	36	40	40
120	60		4	4	6	8	10	6	8	12	16	10	16	24	30	32	40
130	65		4	4	6	8	10	6	8	12	16	10	14	24	30	32	40
140	70		2	4	6	8		6	8	12	8	10	14	20	24	32	40
150	75		2	4	6			6	8	12	8	10	14	20	24	32	30
160	80		2	4	6			6	8	6	8	10	12	20	24	32	30
170	85		2	4	6			4	8	6	8	10	12	20	24	24	30
180	90		2	4				4	8	6	8	10	12	16	24	24	30
190	95		2	4				4	8	6	8	10	12	16	18	24	30
200	100		2	4				4	4	6	8	10	10	16	18	24	30

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.EXHIBIT A Soil and Site Factors that Restrict Mound Systems

	Soil Group
	Slowly Permeable Soils	Permeable Soils With Pervious Bedrock	Permeable Soils With High Water Tables
Percolation rate ^a	180-360 min.	18-180 min.	18-180 min.
Depth to pervious rock	24 in.	24 in.	24 in.
Depth of high water tables	24 in.	24 in.	24 in.
Minimum depth to impermeable soil layer or rock strata	60 in.	60 in.	60 in.
Depth to 50% by volume rock fragments	24 in.	24 in.	24 in.
Slope	6%	12b	12% ^b

^a Percolation test depth at 24 in., 12 in., and 24 in., for slowly permeable, shallow soils and high water table soils, respectively, unless there is a more restrictive horizon above. If perched water is at 24 in., test depth should be held to 16 in.

^b For percolation rate of 18-90 minutes max. slope is 12% and for 18-360 minutes, max. slope is 6%.

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.EXHIBIT B Fine Aggregate Gradations

Sieve Size
Percent Passing
Grad.		No.	No.	No.	No.	No.	No.	No.	No.	No.
No.	3/8	4	8	10	16	40	50	80	100	200
FA 1	100	97±3			65±20		16±13		5±5
FA 2	100	97±3			65±20		20±10		5±5
FA 3	100	97±3		80±15		50±20		25±15		3±3
FA 4	100				5±5
FA 5	100	92±8							20±20	15±15
FA 6		92±8							20±20	5±5
FA 7		100		97±3		75±15		35±10		3±3
FA 8			100			60±20			3±3	2±2
FA 9			100				20±15		5±5
FA 10				100		90±10		60±30		7±7

Horizontal Grade No. indicates the sieve sizes used to test the material sample. FA numbers indicate the Illinois Department of Transportation fine aggregate sizes.

Numbers throughout the table such as 97 ± 3 mean that 97% of the sample, plus or minus 3% of the sample passed through the screen.

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.EXHIBIT C Downslope and Upslope Width Corrections for Mounds on Sloping Sites

Slope %	Downslope (I) Correction Factor	Upslope (J) Correction Factor

0	1.00	1.00

2	1.06	.94

4	1.14	.89

6	1.22	.86

8	1.32	.80

10	1.44	.77

12	1.57	.73

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.EXHIBIT D Allowable Lateral Lengths (Feet) for Three Pipe Diameters, Three Perforation Sizes, and Two Perforations Spacings 906.60 if system is to treat flow from more than 4 bedrooms)

Perforation Spacing (in)	Perforation Diameter (in)	(1 in)	(1¼ in)	(1½ in)
30	³/₁₆	34	52	70
	⁷/₃₂	30	45	57
	¹/₄	25	38	50
36	³/₁₆	36	60	75
	⁷/₃₂	33	51	63
	¹/₄	27	42	54

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.EXHIBIT E Dosing Quantity for Various Sized Homes

Home Size No. Bedrooms	Gallons Day	Dosing Quantity* Gal/Dose
1	200	50
2	400	100
3	600	150
4	800	200

* Each system must be checked to determine if this quantity is at least 10 times the lateral void volume.

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.EXHIBIT F Void Volume for Various Diameter Pipes

Diameter inch	Volume gal/ft/length
1	.041
1¼	.064
1½	.092
2	.164
3	.368
4	.655
6	1.470

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.EXHIBIT G Pumping Chamber Sizes for Various Sized Homes

Home Size No. Bedrooms	Minimum Pumping Chamber Size Gallons
1	250-500
2	250-500
3	500-750
4	500-750

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.EXHIBIT H Perforation Discharge Rates in Gallons per Minute Versus Perforation Diameter and In-Line Pressure

In-Line Pressure (ft)	Perforation Diameter (in)

¹/₄	⁵/₁₆	³/₈	⁷/₁₆	¹/₂	⁹/₁₆	⁵/₈
1.0	0.74	1.15	1.66	2.26	2.95	3.73	4.60
1.5	0.90	1.41	2.03	2.76	3.61	4.57	5.64
2.0	1.17	1.82	2.62	3.57	4.66	5.90	7.28
3.0	1.28	1.99	2.87	3.91	5.10	6.46	7.97
3.5	1.38	2.15	3.10	4.22	5.51	6.98	8.61
4.0	1.47	2.30	3.31	4.51	5.89	7.46	9.21
4.5	1.56	2.44	3.52	4.79	6.25	7.91	9.77
5.0	1.65	2.57	3.71	5.04	6.59	8.34	10.29

Section 906.APPENDIX A Illustrations and Exhibits

Section 906.EXHIBIT I Friction Loss in Schedule 40 Plastic Pipe

FRICTION LOSS IN SCHEDULE 40 PLASTIC PIPE, C = 150

(ft/100 ft)

Pipe Diameter (in.)

Flow	1	1¼	1½	2	3	4	6	8	10
gpm

1	0.07
2	0.28	0.07
3	0.60	0.16	0.07
4	1.01	0.25	0.12
5	1.52	0.39	0.18
6	2.14	0.55	0.25	0.07
7	2.89	0.76	0.36	0.10
8	3.63	0.97	0.46	0.14
9	4.57	1.21	0.58	0.17
10	5.50	1.46	0.70	0.21
11		1.77	0.84	0.25
12		2.09	1.01	0.30
13		2.42	1.17	0.35
14		2.74	1.33	0.39
15		3.06	1.45	0.44	0.07
16		3.49	1.65	0.50	0.08
17		3.93	1.86	0.56	0.09
18		4.37	2.07	0.62	0.10
19		4.81	2.28	0.68	0.11
20		5.23	2.46	0.74	0.12
25			3.75	1.10	0.16
30			5.22	1.54	0.23
35				2.05	0.30	0.07
40				2.62	0.39	0.09
45				3.27	0.48	0.12
50				3.98	0.58	0.16
60					0.81	0.21
70					1.08	0.28
80					1.38	0.37
90					1.73	0.46
100					2.09	0.55	0.07
150						1.17	0.16
200							0.28	0.07
250							0.41	0.11
300							0.58	0.16
350							0.78	0.20	0.07
400							0.99	0.26	0.09
450							1.22	0.32	0.11
500								0.38	0.14
600								0.54	0.18
700								0.72	0.24
800									0.32
900									0.38
1000									0.46