Eljen Mantis M5 Series Manuel utilisateur

System Design & Installation Manual

Virginia

www.eljen.com

March 2013

CORPORATION

Innovative Environmental Products & Solutions Since 1970

TOPIC Page

Glossary of Terms ............................................................ 4

Mantis M5Series General Description............................................. 5

1.0 General System Information ................................................. 9

2.0 Systems for Level Sites .....................................................10

3.0 Systems for Sloped Sites ...................................................10

4.0 Trench Installation Guidance................................................. 11

5.0 Pumped System Guidance ..................................................13

6.0 System Ventilation Guidance ................................................14

7.0 Recommended Notes on Design Plans ........................................16

TABLES

Table 1 Specied Sand Sieve Requirements........................................ 4

Table 2 Mantis M5Series GMP 116 Design Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 3 Mantis M5Series GMP 135 Design Table .................................... 7

Table 4 Mantis M5Series GMP 127 Design Table .................................... 8

MANTIS M5SERIES DRAWINGS

Fig. 1 Mantis M5Series Components ............................................ 5

Fig. 2 Mantis M5Series Trench Cross Section .....................................10

Fig. 3 Mantis M5Series Multiple Trench Cross Section ..............................12

Fig. 4 Mantis M5Series Multiple Trench Plan View ..................................12

Fig. 5 Mantis M5 Series Pressure Distribution—Orice Layout.........................13

Fig. 6 Mantis M5 Series Venting Diagram .........................................14

Fig. 7 Mantis M5 Series 2˝ By-Pass Line for Pressurized Systems......................15

Fig. 8 Mantis M5 Series 2˝ By-Pass Line for Pump to Gravity Systems ..................15

Table of Contents

2013 Virginia Mantis M5Design & Installation Manual Page 3 www.eljen.com

Mantis M5 Series Units The Mantis M5Series units come preassembled and are 5 feet in length (as measured

from the Support Distribution Pipe) and 12” high. 12” and 24” wide models are available.

The 12” wide model is the Mantis 5.1, and the 24” wide model is the Mantis 5.2. All mod-

els have 6” of Specied Sand under and to the sides of the product. 1” of Specied Sand

is placed over the units prior to backll.

Support Distribution Pipe The Mantis M5Series Support Distribution Pipe is 5 feet in length and constructed from

crush resistant PVC Pipe. The pipes provide 3 pre-drilled one inch holes at specied

spacing located at the 12, 5 and 7 o’clock position.

Filter Support Module There are 5 Filter Support Modules for each M5unit. All Filter Support Modules are 4”

thick. The 5.1 model is 12” wide and the 5.2 model is 24” wide.

Specied Sand The Specied Sand envelope around the Mantis M5Series (6” minimum underneath, 6”

minimum on the sides, 1” minimum on the top, and 8” in-between the Support Modules)

shall meet the requirements as indicated in the Specied Sand Requirements chart listed

below. This sand is an ASTM C33 WASHED CONCRETE SAND WITH LESS THAN

10% PASSING #100 SIEVE AND LESS THAN 5% PASSING A #200 SIEVE

Ask your material supplier for a sieve analysis to verify that your material meets the re-

quired specications.

TABLE 1: Specied Sand SIEVE REQUIREMENTS

Glossary of Terms

2013 Virginia Mantis M5Design & Installation Manual Page 4 www.eljen.com

Design Flow

The estimated design ow that is used to size a Mantis system is 150 gallons

per day per Bedroom.

Eljen Mantis M5 Series

ASTM C33 Specied Sand Requirements

Sieve Size Sieve Square

Opening Size

Specication

Percent

Passing

(Wet Sieve)

0.375˝ 9.5 mm 100.0

#4 4.75 mm 95.0 – 100.0

#8 2.36 mm 80.0 – 100.0

#16 1.18 mm 50.0 – 85.0

#30 600 µm 25.0 – 60.0

#50 300 µm 5.0 – 30.0

#100 150 µm < 10.0

#200 75 µm < 5.0

Request a sieve analysis from your material supplier to ensure

that the system sand meets the specication requirements

listed above.

Note: Design layouts and installation instructions for

sequential, equal or dosed distribution systems are included.

Details on unique design and construction procedures are

also provided. To receive design standards for specially

engineered dosing systems or commercial systems, contact

Eljen’s Technical Resource Department at 1-800-444-1359.

Mantis M5Series systems must be designed and constructed

according to this Design & Installation Manual and per the

requirements of GMP 116, GMP 135, and GMP 127 where

applicable.

How the Mantis M5Series System Works

The Eljen Mantis M5Series is a wastewater disposal

technology comprised of a proprietary ltering process that

applies claried efuent to the soil. The Mantis M5Series

performance is based on accepted industry principals of

increasing the receiving soils long term acceptance rate

by keeping the biological growth off the native soils and

within the system. This technology utilizes 3 dimensional

surface areas to improve efuent quality, resulting in greater

reliability and ease of operation.

• The Support Distribution Pipe provides internal distribution,

a venting conduit for the system and secures the ve

Filter Support Modules in place. This distribution pipe is

centered within the Filter Support Module to distribute

septic efuent.

• Septic efuent is ltered through the Filter Support Modules.

Each module consists of a cuspated core surrounded by

Bio-Matt geo-textile fabric. Its unique design provides

increased surface area within each module. This area is

known as the Internal Surface Optimization envelope, ISO

for short. The ISO envelope provides an increased surface

area that greatly exceeds the Filter Support Module’s

footprint, a traditional gravel footprint or that of a graveless

replacement technology.

• Open air channels within the modules support aerobic

bacterial growth on the Filter Support Modules geotextile

fabric interface, surpassing the surface area provided by

traditional absorption systems.

• Efuent is transferred into the Specied Sand layer

which supports unsaturated ow into the native soil. This

Specied Sand and soil interface maintains soil structure

while maximizing the available absorption of the native

soil.

• The Specied Sand layer also protects the soil from

compaction and helps maintain existing pore spaces in the

soil. This preserves the soil’s natural inltration capacity

which is critical for long-term performance, especially in

ner textured soils.

Mantis M5Series General Description

2013 Virginia Mantis M5Design & Installation Manual Page 5 www.eljen.com

FIGURE 1: MANTIS M5SERIES COMPONENTS

4" SUPPORT

DISTRIBUTION PIPE

(SDP)

FILTER

SUPPORT

MODULE

(FSM)

THE SDP PROVIDES (3) PRE-DRILLED,

ONE-INCH HOLES WITHIN EACH MODULE

LOCATED AT THE 12, 5 AND 7 O'CLOCK POSITION

12"

60"

MANTIS M5 UNIT

* NOTE

*NOTE: PRODUCT & INSTALL WIDTH WILL VARY DEPENDING ON MODLE USED.

SEE FIGURE 2 FOR MORE INFORMATION.

SPECIFIED SAND

*NOTE

18"

TABLE 2: MANTIS M5 SERIES GMP 116 DESIGN TABLE

NOTE: Hydraulic loading rates shown reect the maximum reduction allowed for systems per GMP 116.

1. Number of Mantis M5 Series units is determined on the current VDH loading rates dened in 12 VAC 5-610-950

2. Mantis M5Series 5.2 unit = 6 ft²/lf or 30 ft² per unit, and a minimum of 20 units

3. Mantis M5Series 5.1 unit = 4 ft²/lf or 20 ft² per unit, and a minimum of 30 units

4. The minimum Mantis M5Series system area required is 300 ft²

5. The minimum number of bedrooms for residential designs shall be 2 bedrooms

Mantis M5Series GMP 116 Design Table

2013 Virginia Mantis M5Design & Installation Manual Page 6 www.eljen.com

Soil

Texture

Percolation

Rate

(mpi)

Soil

Typ

5 I 0.91 165 45 930 6

10 I0.83 181 50 10 35 7

15 I0.76 198 50 10 35 7

20 IIa 0.68 218 55 11 40 8

25 IIa 0.63 237 60 12 40 8

30 IIb 0.57 260 65 13 45 9

35 IIb 0.52 286 75 15 50 10

40 IIb 0.48 314 80 16 55 11

45 IIb 0.44 344 90 18 60 12

50 III 0.4 376 95 19 65 13

55 III 0.36 412 105 21 70 14

60 III 0.33 452 115 23 80 16

65 III 0.3 496 125 25 85 17

70 III 0.28 544 140 28 95 19

75 III 0.25 596 150 30 100 20

80 III 0.23 656 165 33 110 22

85 III 0.21 718 180 36 120 24

90 III 0.19 786 200 40 135 27

95 IV 0.17 862 220 44 145 29

100 IV 0.16 946 240 48 160 32

105 IV 0.14 1038 260 52 175 35

110 IV 0.13 1138 285 57 190 38

115 IV 0.12 1248 315 63 210 42

120 IV 0.11 1368 345 69 230 46

All Values per Bedroom (See Notes Below)

Soil

Rates

(gpd/ ft2)

Square

Feet

Required

Mantis M

5.1

Gravity

or LPD

Linear

Feet

Required

Mantis M

5.1

Gravity

or LPD

5.1

Units

Required

Mantis M

5.2

Gravity

or LPD

Linear

Feet

Required

Mantis M

5.2

Gravity

or LPD

5.2

Units

Required

Sand &

Loamy Sand

Sandy Loam

Loam &

Sandy Clay

Loam

Silt Loam,

Clay Loam &

Silty Clay Loam

Sandy Clay,

Silty Clay &

Clay

Mantis M5Series GMP 135 Design Table

TABLE 3: MANTIS M5SERIES GMP 135 DESIGN TABLE

NOTE: Hydraulic loading rates shown reect the maximum reduction allowed for systems per GMP 135.

1. Number of Mantis M5 Series units is determined on the current VDH loading rates dened in 12 VAC 5-610-950

2. Mantis M5Series 5.2 unit = 4 ft²/lf or 20 ft² per unit in Soil Classes I – III &

3.53 ft²/lf or 17.65 ft² per unit in Soil Class IV

Minimum of 20 units

3. Mantis M5Series 5.1 unit= 2.67 ft²/lf or 13.35 ft² per unit in Soil Classes I – III &

2.35 ft²/lf or 11.75 ft² per unit in Soil Class IV

Minimum of 30 units

4. The minimum Mantis M5system area required is 300 ft²

5. The minimum number of bedrooms for residential designs shall be 2 bedrooms

2013 Virginia Mantis M5Design & Installation Manual Page 7 www.eljen.com

Soil

Texture

Percolation

Rate

(mpi)

Soil

Typ

5 I 0.91 165 65 13 45 9

10 I0.83 181 70 14 50 10

15 I0.76 198 75 15 50 10

20 IIa 0.68 218 85 17 55 11

25 IIa 0.63 237 90 18 60 12

30 IIb 0.57 260 100 20 65 13

35 IIb 0.52 286 110 22 75 15

40 IIb 0.48 314 120 24 80 16

45 IIb 0.44 344 130 26 90 18

50 III 0.4 376 145 29 95 19

55 III 0.36 412 155 31 105 21

60 III 0.33 452 170 34 115 23

65 III 0.3 496 190 38 125 25

70 III 0.28 544 205 41 140 28

75 III 0.25 596 225 45 150 30

80 III 0.23 656 250 50 165 33

85 III 0.21 718 270 54 180 36

90 III 0.19 786 295 59 200 40

95 IV 0.17 862 370 74 245 49

100 IV 0.16 946 405 81 270 54

105 IV 0.14 1038 445 89 295 59

110 IV 0.13 1138 485 97 325 65

115 IV 0.12 1248 535 107 355 71

120 IV 0.11 1368 585 117 390 78

Sand &

Loamy Sand

Sandy Loam

Loam &

Sandy Clay

Loam

Silt Loam,

Clay Loam &

Silty Clay Loam

Sandy Clay,

Silty Clay &

Clay

All Values per Bedroom (See Notes Below)

Soil

Rates

(gpd/ ft2)

Square

Feet

Required

Mantis M

5.1

Gravity

or LPD

Linear

Feet

Required

Mantis M

5.1

Gravity

or LPD

5.1

Units

Required

Mantis M

5.2

Gravity

or LPD

Linear

Feet

Required

Mantis M

5.2

Gravity

or LPD

5.2

Units

Required

TABLE 4: MANTIS M5SERIES GMP 127 DESIGN TABLE

NOTE: Hydraulic loading rates shown reect the maximum reduction allowed for systems per GMP 135

1. Number of Mantis M5 Series units is determined on the current VDH loading rates dened in 12 VAC 5-610-950

2. Mantis M5Series 5.2 unit = 3 ft²/lf or 15 ft² per unit, minimum of 20 units

3. Mantis M5Series 5.1 unit = 2 ft²/lf or 10 ft² per unit, minimum of 30 units

4. The minimum Mantis M5system area required is 300 ft²

5. The minimum number of bedrooms for residential designs shall be 2 bedrooms

Mantis M5Series GMP 127 Design Table

2013 Virginia Mantis M5Design & Installation Manual Page 8 www.eljen.com

Soil

Texture

Percolation

Rate

(mpi)

Soil

Typ

5 I 0.91 165 85 17 55 11

10 I0.83 181 95 19 65 13

15 I0.76 198 100 20 70 14

20 IIa 0.68 218 110 22 75 15

25 IIa 0.63 237 120 24 80 16

30 IIb 0.57 260 130 26 90 18

35 IIb 0.52 286 145 29 100 20

40 IIb 0.48 314 160 32 105 21

45 IIb 0.44 344 175 35 115 23

50 III 0.4 376 190 38 130 26

55 III 0.36 412 210 42 140 28

60 III 0.33 452 230 46 155 31

65 III 0.3 496 250 50 170 34

70 III 0.28 544 275 55 185 37

75 III 0.25 596 300 60 200 40

80 III 0.23 656 330 66 220 44

85 III 0.21 718 360 72 240 48

90 III 0.19 786 395 79 265 53

95 IV 0.17 862 435 87 290 58

100 IV 0.16 946 475 95 320 64

105 IV 0.14 1038 520 104 350 70

110 IV 0.13 1138 570 114 380 76

115 IV 0.12 1248 625 125 420 84

120 IV 0.11 1368 685 137 460 92

Silt Loam,

Clay Loam &

Silty Clay Loam

Sandy Clay,

Silty Clay &

Clay

Soil

All Values per Bedroom (See Notes Below)

Sand &

Loamy Sand

Sandy Loam

Loam &

Sandy Clay

Loam

Mantis M

5.1

Gravity

or LPD

Linear

Feet

Required

Mantis M

5.1

Gravity

or LPD

5.1

Units

Required

Mantis M

5.2

Gravity

or LPD

Linear

Feet

Required

Mantis M

5.2

Gravity

or LPD

5.2

Units

Required

Rates

(gpd/ ft2)

Square

Feet

Required

1.0 General System Information

to prevent surface ponding. Seed or sod excavated areas

to protect against erosion.

1.8 EFFLUENT FILTERS: Efuent lters are recommended

as a means of preventing solids from leaving the tank.

1.9 DISTRIBUTION PIPE LAYOUT: No additional

distribution pipe is needed to connect units to one another.

The Support Distribution Pipe runs through the center of the

units and provides distribution for all congurations. For

bed systems, the distal ends of rows may be connected with

non-perforated pipe.

1.10 GARBAGE DISPOSALS: The use of a garbage

disposal is not recommended as they can cause septic

system problems by generating an increased amount of

suspended solids, grease and nutrients. Design drawings

shall include a note “Garbage disposals shall not be used

with this system”.

However, if such units are proposed to be used, other

measures must be taken to prevent solids from leaving the

tank and entering the drain eld system such as:

· Increasing the septic tank capacity by a minimum

of 30%, or

· Installation of a second septic tank installed in

series, or

· Installation of an appropriate sized septic tank outlet

efuent lter.

NOTE: Eljen recommends the use of septic tank outlet

efuent lters on all systems, especially on those systems

that a garbage disposal is installed, even if the tanks design

capacity has been increased. Filters with higher ltration are

recommended for systems with garbage disposals.

1.11 ADDITIONAL FACTORS EFFECTING RESIDENTIAL

SYSTEM SIZE: Homes with expected higher than normal

water usage should consider increasing the septic tank

volume as well as increasing the size and number of units

in the disposal area. For example: Homes with tubs holding

more than 100 gallons or utilizing other high use xtures and

homes with higher than normal occupancy should consider

septic tank and drain eld modications.

1.12 WATER SOFTENERS OR CONDITIONERS: Discharge

of water softener or conditioner backwash to Eljen Products

is not allowed. Discharge from these devices shall be into a

separate disposal system meeting the requirements of State

and Local Regulations.

1.1 SYSTEM FIELD SIZE AND NUMBER OF UNITS:

System size will vary depending on design ow and soil

analysis. Tables 2 - 4 indicate the minimum number of

Mantis units required for various soil percolation rates and

design ows.

1.2 NON-RESIDENTIAL BUILDINGS & RESIDENTIAL

INSTITUTIONS: Commercial systems require different

sizing and design criteria as compared to residential systems.

Please contact Eljen’s Technical Resource Department

at 1-800-444-1359 for more information on commercial

systems.

1.3 DEPTH TO GROUND WATER OR RESTRICTIVE

LAYER: As required by state regulations; the bottom of

the Mantis M5Series system requires an 18-inch minimum

separation distance from the maximum seasonal high

groundwater table or bedrock. Note: For GMP’s 116, 127, &

135 – 18” separation distance must be measured from the

bottom of 6” sand layer.

1.4 Specied Sand SPECIFICATION FOR TRENCH

SYSTEMS: The rst 6 inches of Specied Sand immediately

under, between Filter Support Modules, between unit rows

and around the perimeter of the Mantis M5Series system

must be an ASTM C33 WASHED CONCRETE SAND WITH

LESS THAN 10% PASSING A #100 SIEVE AND LESS

THAN 5% PASSING A #200 SIEVE.

1.5 VEHICULAR TRAFFIC AND PAVED AREAS OVER

SYSTEM: All vehicular trafc is prohibited over the Mantis

system. This is due to the compaction of material required

to support trafc loading. Compaction greatly diminishes

absorption below the system and reduces the void space

that naturally exists in soils for oxygen transfer and water

migration. For shallow installations, light-weight track-

mounted machines are best for setting the nal grade. It is

also permissible to back-blade the soil to set nal minimum

cover.

1.6 SYSTEM VENTING: Eljen mandates venting when the

system has greater than 18” of cover material as measured

from the top of the unit to nished grade. This will ensure

proper aeration of the units.

1.7 BACKFILL & FINISH GRADING: Complete backll over

the Mantis M5 units followed by topsoil to a depth of 6” –

18” as measured from the top of the units. 1” of the ll is

Specied Sand, immediately on top of the unit. Systems

with total cover that exceeds 18” as measured from the top

of the units to nished grade shall be vented at the distal

(far) end of the system. Backll material shall be well graded

sandy ll; clean, porous, and devoid of large rocks. Divert

surface runoff with diversion ditches or berms. Finish grade

2013 Virginia Mantis M5Design & Installation Manual Page 9 www.eljen.co3

1.13 PLANS AND SPECIFICATIONS: Typical system

drawings and specications are shown at the end of this

manual. When used in conjunction with a permit sketch, site

specic specications, and manufacturer installation criteria,

these documents will normally be sufcient to assure

1.0 General System Information, Continued

2.0 Design for Level Sites

2.1 TRENCH ROW SPACING: Center-to-center spacing

must be no less than three times the width of the trench for

slopes up to 10%. For slopes over 10%, add one extra foot

of separation for every 10% increase in slope. The Mantis

M5 units and Specied Sand must be installed level at their

design elevations.

3.0 Design for Sloped Sites

3.1 TRENCH ROW SPACING: Center-to-center spacing

must be no less than three times the width of the trench for

slopes up to 10%. For slopes over 10%, add one extra foot

of separation for every 10% increase in slope. The Mantis

M5 units and Specied Sand must be installed level at their

design elevations.

2013 Virginia Mantis M5Design & Installation Manual Page 10 www.eljen.com

a system can be properly installed. In some instances

where a complex system is encountered, formal plans and

specications may be required. This determination is left to

the discretion of the District Health Department.

FIGURE 2 : MANTIS M5SERIES TRENCH CROSS SECTION

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