15 Miss. Code. R. 18-77-5.5.19

Current through December 10, 2024

Rule 15-18-77-5.5.19 - Sizing of the Chamber System

1. Chamber systems installed in a trench configuration shall be sized in accordance with Table VIII.

2. Chamber systems installed in a bed configuration shall have the same number of chamber sections as indicated for a trench system. The length and width of the bed to be constructed will depend on the number of chamber sections to be installed as indicated by Table VIII. Any side-by-side placement of chambers shall constitute a bed.

a. Absorption beds and trenches should be located a minimum of 10 feet from any trees.

b. The bottom of the bed should have a relatively level grade; the grade within the bed shall not exceed the grade allowed for trench installations.

c. The chambers shall be placed side by side in a bed with separation between each chamber row per individual manufacturer's requirements.

d. Care should be taken to prevent heavy machinery from damaging the bed during backfilling.

e. The effluent must be equally distributed to the bed by means of a distribution box or with a pipe manifold.

SETBACK REQUIREMENTS FROM SENSITIVE WATER

Minimum Distance from the Water Edge

Soil Textural Class	Slope of Less Than 8 Percent	Slope of More Than 8 Percent
Gravel	NOT APPLICABLE
Coarse Sand	50 feet	50 feet
Medium Sand	50 feet	50 feet
Fine Sand	50 feet	50 feet
Loamy Sand	50 feet	50 feet
Sandy Loam	50 feet	50 feet
Light Loam	50 feet	50 feet
Heavy Loam	50 feet	50 feet
Silt Loam	50 feet	50 feet
Sandy Clay Loam	50 feet	50 feet
Light Clay Loam	50 feet	50 feet
Heavy Clay Loam	50 feet	50 feet
Light Silty Clay Loam	50 feet	50 feet
Heavy Silty Clay Loam	50 feet	50 feet
Sandy Clay	50 feet	50 feet
Silty Clay	50 feet	50 feet
Clay	50 feet	50 feet

The effluent disposal setback is based on the soil texture of the horizon in which the absorption trench or bed is to be placed. These setbacks are to be used on all individual on-site wastewater disposal systems except spray irrigation disposal and overland discharge.

SIZING - AGGREGATE REPLACEMENT (Large Diameter Pipe)

Results of the Soil and Site Evaluation

Soil Textural Class	Ribbon Lengths (Inches)	EPA Manual Application Rate GPD/ Ft 2	Absorption Area Per Bedroom**						Additional Absorption Area Over 2 Persons Per Bedroom**
			Ft 2			*Lf			Ft 2			*Lf
			6	8	10	6	8	10	6	8	10	6	8	10
Gravel	-	-	NOT SUITABLE
Coarse Sand	-	1.2	164	164	108	55	55	36	82	82	54	27	27	18
Medium Sand	-	1.2	164	164	108	55	55	36	82	82	54	27	27	18
Fine Sand	-	0.8	247	247	165	82	82	55	124	124	82	41	41	27
Loamy Sand	-	0.8	247	247	165	82	82	55	124	124	82	41	41	27
Sandy Loam	<.5	0.6	325	325	217	108	108	72	163	163	108	54	54	36
Light Loam	<.5	0.6	325	325	217	108	108	72	163	163	108	54	54	36
Heavy Loam	.5 - 1	0.45	437	437	290	146	146	97	218	218	145	73	73	48
Silt Loam	<1	0.45	437	437	290	146	146	97	218	218	145	73	73	48
Sandy Clay Loam	1 - 2	0.45	437	437	290	146	146	97	218	218	145	73	73	48
Light Clay Loam	1 - 1.5	0.30	650	650	433	217	217	144	325	325	217	108	108	72
Heavy Clay Loam	1.5 - 2.0	0.20	975	975	650	325	325	217	488	488	325	163	163	108
Light Silty Clay Loam	1 - 1.5	0.30	650	650	433	217	217	144	325	325	217	108	108	72
Heavy Silty Clay Loam	1.5 - 2.0	0.20	975	975	650	325	325	217	488	488	325	163	163	108
Sandy Clay	>2.0	-	NOT SUITABLE
Silty Clay	>2.0	-	NOT SUITABLE
Clay	>2.0	-	NOT SUITABLE

Minimum and maximum trench widths are 24 and 36 inches, respectively.

*Linear footages assume 24 inch trench width.

** Bedroom is equivalent to 130 gallons per day.

SIZING - AGGREGATE REPLACEMENT (Multi-Pipe System)

Results of the Soil and Site Evaluation

Soil Textural Class	Ribbon Lengths (Inches)	EPA Manual Application Rate GPD/ Ft 2	Absorption Area Per Bedroom**					Additional Absorption Over 2 Person Per Bedroom**
			MPS -14 & 36XX ***		MPS-13	MPS-11	MPS-9	MPS-14 & 36XX ***		MPS-13	MPS-11	MPS-9
			Ft 2	Lf	Lf	Lf	Lf	Ft 2	Lf	Lf	Lf	Lf
Gravel	-	-	NOT SUITABLE
Coarse Sand	-	1.2	108	36	28	32	38	54	18	14	16	19
Medium Sand	-	1.2	108	36	28	32	38	54	18	14	16	19
Fine Sand	-	0.8	163	54	42	49	58	81	27	21	24	29
Loamy Sand	-	0.8	163	54	42	49	58	81	27	21	24	29
Sandy Loam	<.5	0.6	217	72	55	64	76	108	36	28	32	38
Light Loam	<.5	0.6	217	72	55	64	76	108	36	28	32	38
Heavy Loam	.5 - 1	0.45	289	96	74	86	102	144	48	37	43	51
Silt Loam	<1	0.45	289	96	74	86	102	144	48	37	43	51
Sandy Clay Loam	1 - 2	0.45	289	96	74	86	102	144	48	37	43	51
Light Clay Loam	1 - 1.5	0.30	433	144	110	128	171	217	72	55	64	77
Heavy Clay Loam	1.5 - 2.0	0.20	650	217	165	193	230	325	108	82	97	115
Light Silty Clay Loam	1 - 1.5	0.30	433	144	110	128	171	217	72	55	64	77
Heavy Silty Clay Loam	1.5 - 2.0	0.20	650	217	165	193	230	325	108	82	97	115
Sandy Clay	>2.0	-	NOT SUITABLE
Silty Clay	>2.0	-	NOT SUITABLE
Clay	>2.0	-	NOT SUITABLE

Minimum and maximum trench widths are 24 and 36 inches, respectively.

** Bedroom is equivalent to 130 gallons per day.

***XX represents either 9, 11, or 14 pipes.

SIZING - AGGREGATE REPLACEMENT (Expanded Polystyrene System) "Horizontal" Configuration

Results of the Soil and Site Evaluation

Soil Textural Class	Ribbon Lengths (Inches)	EPA Manual Application Rate GPD/ Ft 2	Absorption Area Per Bedroom**						Additional Absorption Over 2 Person Per Bedroom**
			3-10H		1-12	2-12	3-12	1-14	3-10H		1-12	2-12	3-12	1-14
			Ft 2	Lf	Lf	Lf	Lf	Lf	Ft 2	Lf	Lf	Lf	Lf	Lf
Gravel	-	-	NOT SUITABLE
Coarse Sand	-	1.2	108	30	75	37	25	36	54	15	38	19	13	18
Medium Sand	-	1.2	108	30	75	37	25	36	54	15	38	19	13	18
Fine Sand	-	0.8	163	46	114	57	38	55	81	23	57	29	19	28
Loamy Sand	-	0.8	163	46	114	57	38	55	81	23	57	29	19	28
Sandy Loam	<.5	0.6	217	60	151	75	50	72	108	30	76	38	25	36
Light Loam	<.5	0.6	217	60	151	75	50	72	108	30	76	38	25	36
Heavy Loam	.5 - 1	0.45	289	81	201	101	67	97	144	40	101	52	33	49
Silt Loam	<1	0.45	289	81	201	101	67	97	144	40	101	52	33	49
Sandy Clay Loam	1 - 2	0.45	289	81	201	101	67	97	144	40	101	52	33	49
Light Clay Loam	1 - 1.5	0.30	433	120	299	153	100	144	217	60	100	77	50	72
Heavy Clay Loam	1.5 - 2.0	0.20	650	178	449	225	150	217	325	89	225	113	75	109
Light Silty Clay Loam	1 - 1.5	0.30	433	120	299	153	100	144	217	60	100	77	50	72
Heavy Silty Clay Loam	1.5 - 2.0	0.20	650	178	449	225	150	217	325	89	225	113	75	109
Sandy Clay	>2.0	-	NOT SUITABLE
Silty Clay	>2.0	-	NOT SUITABLE
Clay	>2.0	-	NOT SUITABLE

Minimum and maximum trench widths are 24 and 36 inches, respectively.

** Bedroom is equivalent to 130 gallons per day.

SIZING - AGGREGATE REPLACEMENT (Expanded Polystyrene System) "Triangular" Configuration

Results of the Soil and Site Evaluation

Soil Textural Class	Ribbon Lengths (Inches)	EPA Manual Application Rate GPD/ Ft 2	Absorption Area Per Bedroom**		Additional Absorption Over 2 Person Per Bedroom**
			3-10 Inch		3-10 Inch
			Ft 2	Lf	Ft 2	Lf
Gravel	-	-	NOT SUITABLE
Coarse Sand	-	1.2	54	27	26	13
Medium Sand	-	1.2	54	27	26	13
Fine Sand	-	0.8	83	42	42	21
Loamy Sand	-	0.8	83	42	42	21
Sandy Loam	<.5	0.6	109	55	55	28
Light Loam	<.5	0.6	109	55	55	28
Heavy Loam	.5 - 1	0.45	146	73	73	36
Silt Loam	<1	0.45	146	73	73	36
Sandy Clay Loam	1 - 2	0.45	146	73	73	36
Light Clay Loam	1 - 1.5	0.30	217	108	109	55
Heavy Clay Loam	1.5 - 2.0	0.20	326	163	163	81
Light Silty Clay Loam	1 - 1.5	0.30	217	108	109	55
Heavy Silty Clay Loam	1.5 - 2.0	0.20	326	163	163	81
Sandy Clay	>2.0	-	NOT SUITABLE
Silty Clay	>2.0	-	NOT SUITABLE
Clay	>2.0	-	NOT SUITABLE

Minimum and maximum trench widths are 24 and 36 inches, respectively. The Triangular Configuration can only be installed in a trench.

** Bedroom is equivalent to 150 gallons per day.

CHAMBER SYSTEM

Classification

CLASS	SQUARE FEET/CHAMBER SECTION
7.51 - 9.50
II	9.51 - 11.50
III	11.51 - 13.50
IV	13.51 - 15.50
V	15.51 - 17.50
VI	17.51 - 19.50
VII	19.51 - 21.50
VIII	21.51 - 23.50

SIZING - AGGREGATE REPLACEMENT (Chamber System)

Results of the Soil and Site Evaluation

Soil Textural Class	Ribbon Lengths (Inches)	EPA Manual Application Rate GPD/ Ft 2	Absorption Area in Ft 2 Per Bedroom**	Number of Pieces Per Bedroom based on Chamber Class**				Additional Pieces Over 2 Persons Per Bedroom Based on Chamber Class**
				I	II	III	IV	I	II	III	IV
Gravel	-	-	NOT SUITABLE
Coarse Sand	-	1.2	76	9	7	6	5	5	4	3	3
Medium Sand	-	1.2	76	9	7	6	5	5	4	3	3
Fine Sand	-	0.8	115	13	11	10	8	7	6	5	4
Loamy Sand	-	0.8	115	13	11	10	8	7	6	5	4
Sandy Loam	<.5	0.6	152	17	15	12	10	9	8	6	5
Light Loam	<.5	0.6	152	17	15	12	10	9	8	6	5
Heavy Loam	.5 - 1	0.45	204	23	19	16	14	9	8	6	5
Silt Loam	<1	0.45	204	23	19	16	14	12	10	8	7
Sandy Clay Loam	1 - 2	0.45	204	23	19	16	14	12	10	8	7
Light Clay Loam	1 - 1.5	0.30	303	33	28	24	21	17	14	12	11
Heavy Clay Loam	1.5 - 2.0	0.20	455	50	43	34	30	25	22	17	15
Light Silty Clay Loam	1 - 1.5	0.30	303	33	28	24	21	17	14	12	11
Heavy Silty Clay Loam	1.5 - 2.0	0.20	455	50	43	34	30	25	22	17	15
Sandy Clay	>2.0	-	NOT SUITABLE
Silty Clay	>2.0	-	NOT SUITABLE
Clay	>2.0	-	NOT SUITABLE

Minimum and maximum trench widths are 18 and 36 inches, respectively.

** Bedroom is equivalent to 150 gallons per day.

Figure I - Top View of Connecting Laterals for Large Diameter Pipes

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Figure II - Connection Laterals of Multi-pipe System, Expanded Polystyrene System, and Chamber System

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15 Miss. Code. R. 18-77-5.5.19

Miss Code Ann. § 41-67-3