Eljen Mantis m5 series User manual

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

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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

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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

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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

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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

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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

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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

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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.

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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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4.0 Trench Installation Guidance

1. Carefully lay out all boundaries dening the location and

elevation for all system components.

2. Prepare the site according to state and local regulations.

Do not install a system on frozen or saturated soils.

Take precautions not to compact or smear the area with

heavy machinery.

3. Plan all drainage requirements above (up-slope)

the system and set soil grades to insure storm water

drainage and surface water is diverted away from the

absorption area once the system is complete.

4. Excavate a minimum thirty-six inch (36”) wide level

trench for the Mantis 5.2 unit or a minimum twenty-

four inch (24”) wide level trench for the Mantis 5.1 unit.

Remove all organic soil, roots, and rocks within the

absorption trench area.

5. Scarify receiving layers including sidewalls to eliminate

soil smearing. Once scarifying is completed, avoid

walking over prepared absorption area until the Specied

Sand has been placed on the bottom of the trench.

6. Place, compact, and rake a minimum 6” level layer of

Specied Sand along the trench bottom. Specied Sand

must meet the minimum requirements listed on Table

1 of this manual. Ask your material supplier for a sieve

analysis report to verify that the sand you are going

to install meets this specication. A hand tamper or a

vibratory plate compactor is sufcient for compaction of

the Specied Sand layer.

7. Center the Mantis units in the trench with the fabric side

up, adjust the Filter Support Modules to ensure they are

spaced evenly and have not shifted during placement.

8. Connect the units by inserting the Support Distribution

Pipe to one another. Direction changes are accomplished

by using a variety off the shelf ttings.

9. Install a termination cap or vent piping if required at the

distal (far) end of the distribution pipe.

10. Begin placing Specied Sand between the Filter Support

Modules and to the sides of the units. Specied Sand

must be placed lightly and may be accomplished with a

backhoe or other suitable equipment. DO NOT dump full

loads of Specied Sand directly on the units.

11. Steps for placement of Specied Sand.

a. Starting at the top center of the units, use a

minimal amount of Specied Sand necessary to

set in place the bottom section of the Filter Support

Modules at their correct spacing.

b. Compact the sand that is in-between the Filter

Support Modules. Ensure that the void area

under the Support Distribution Pipe is lled and

compacted with Specied Sand.

c. Additional Specied Sand is lightly added between

the Filter Support Modules and along the sides of

the Mantis units to bring the sand ll 1-inch above

the Filter Support Modules to account for sand

settling.

d. Continue to moderately tamp and compact the

sand that is in-between the Filter Support Modules.

Spread additional Specied Sand as necessary.

12. Set distribution box to the proper elevation to achieve a

1/8” drop per foot to the rst unit. Make the connection

to the beginning of the rst unit from the distribution box

with SDR-35 pipe or equivalent.

13. Complete backll over the Mantis M5units 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 to

prevent surface ponding. Seed or sod excavated areas

to protect against erosion. Do not drive or pave over the

absorption area.

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FIGURE 4: MANTIS M5 SERIES MULTIPLE TRENCH PLAN VIEW

FIGURE 3: MANTIS M5SERIES MULTIPLE TRENCH CROSS SECTION

4.0 Trench Installation Drawings

MANTIS 5.2

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5.0 Pumped System Guidance

5.1 PUMP DOSED DISTRIBUTION BOX: Specify an

oversized distribution box for pumped systems. Provide

velocity reduction in the D-box with a tee or bafe.

5.2 PRESSURE OR PUMPED DOSED DESIGN CRITERIA:

Dosing volume must be set to deliver a maximum of 6 gallons

per Mantis 5.2 per dose cycle or 3 gallons per Mantis 5.1 per

dose cycle.

5.3 LOW PRESSURE DISTRIBUTION: Per 12 VAC 5-610-

940 (c) (1), Pressure percolation lines should have a minimum

1-1/4 inch inside diameter. Orices should be designed at

3/16 inch to 1/4 inch in diameter and at pre-determined

intervals per design and code. Design requirements will vary

depending on length of system and dose volume. At least

one drain hole per line at the 6 o’clock position must added

to each line.

Flushing ports are required at the distal end of all pressure

distribution networks. Flushing valves and vents can be

consolidated in larger systems by using valves on the outlet

manifold.

FIGURE 5 : MANTIS M5SERIES PRESSURE DISTRIBUTION—ORIFICE LAYOUT

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6.0 System Ventilation Guidance

6.1 SYSTEM VENTILATION: Air vents are required at the

distal end of unit rows on all absorption systems with more

than 18 inches of soil cover as measured from the top of the

Mantis units or located under impervious surfaces. This will

ensure proper aeration of the Mantis system. The extension

of the distribution pipe at the distal end of each row to

the vent provides adequate delivery of air into the Mantis

system, as shown in Figure 6.

The vent is usually a 4-inch diameter pipe extended to a

FIGURE 6: MANTIS M5 SERIES VENTING DIAGRAM

convenient location behind shrubs. Corrugated pipe can be

used to vent the system. Make sure the pipe has a pitch

towards the surface so it does not accumulate water or

condensation that will close of the airow to the system.

If a pump dosed system is specied with greater than 18

inches of cover, an additional 2-inch minimum airline must

be extended from the D-box back to a knockout or riser

on the septic tank or pump chamber. This maintains the

continuity of airow from the eld.

6.0 System Ventilation Example Drawing

FIGURE 7: MANTIS M5 SERIES 2˝ BY-PASS LINE FOR PRESSURIZED SYSTEMS

FIGURE 8: MANTIS M5 SERIES 2˝ BY-PASS LINE FOR PUMP TO GRAVITY SYSTEMS

NATIVE SOIL

OR SEPTIC TANK

PUMP CHAMBER

PER DESIGN

SPECIFIED SAND

2" BY-PASS AIR LINE

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7.0 Recommended Notes on Design Plans

• This system is not designed for backwash from a water

softener.

• This system (is/is not) designed for the use of a garbage

disposal.

• The Mantis system is not for use under vehicular trafc

or for under paving applications.

• Organic topsoil layer must be removed from trench and

slope extension areas prior to approved ll or Specied

Sand placement. Scarify subsoil prior to select ll or

Specied Sand placement.

• All Mantis M5 Series installations utilize a Specied Sand

envelope around the units. 6” minimum underneath,

6” minimum on the sides, 1” minimum on top, and 8”

between the Filter Support Modules. The Specied Sand

specication is listed below: The Specied Sand shall

be washed concrete sand meeting the requirements of

ASTM C33 with less than 10% passing a #100 sieve

and less than 5% passing a #200 sieve.

• Eljen Corporation recommends the use of an appropriate

sized septic tank efuent lter for all Mantis systems.

• Pumped systems shall have an oversized distribution

box utilizing a velocity reduction tee or bafe.

• Eljen mandates venting when the system will have more

than 18˝ of cover material as measured from the top of

the unit to nished grade.

• After backll, there should be a minimum of 6˝ of

material as measured from the top of the Filter Support

Modules to the nished grade. The rst inch of that ll is

Specied Sand.

• Backll and Finish Grading: Carefully place backll over

the units, followed by a total minimum depth of 6 - 18

inches of well graded sandy ll; clean, porous, and devoid

of rocks, as measured from the top of the Filter Support

Modules. Finish grade must divert surface runoff from

the system area and prevent surface ponding. Protect

the system area from erosion by loaming and seeding

or by using other approved methods of erosion control.

• Fill material shall meet the Eljen Mantis M5Series Design

& Installation Manual requirements. All ll material shall

be clean sand, free of topsoil, directly beneath the STA.

• For pumped systems, set pump oats or pump control

panels to deliver a maximum of 6 gallons per Mantis

5.2 per dose cycle or 3 gallons per Mantis 5.1 per dose

cycle.

• This design complies with and must be installed in

accordance with the most current Eljen Design and

Installation Manual.

2013 Virginia Mantis M5Design & Installation Manual Page 16 www.eljen.com

Eljen Mantis M5 Series

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.

Specied Sand SIEVE REQUIREMENTS

GMP #116–Appendix A

2013 Virginia Mantis M5Design & Installation Manual Page 17 www.eljen.com

Appendix A contains two versions of the Warranty, Notice of Substitution

and Waiver. The rst is to be used when VDH has issued a permit for a

gravel-type draineld system and the Owner elects to install a Substituted

System. The second is to be used when an AOSE or a PE has specied a

Substituted System as part of a design package for a construction permit.

WARRANTY,

NOTICE OF SUBSTITUTION

AND

WAIVER OF LIABILITY

County/City of ____________________________________________________________

Sewage Disposal System Construction Permit ID # ______________________________

Tax Map # ____________________ or property description:_______________________

Owner:__________________________________________________________________

Date: ___________________________________________________________________

LIMITED FIVE YEAR WARRANTY

(a) [Insert Manufacturer] (the “Company”) warrants that the [insert product] manufactured

by the Company (collectively, the “Units”), when installed and operated in accordance

with the manufacturer’s instructions and the current Virginia Department of Health GMP

116, Use of Gravelless Systems at Manufacturer’s Specications, and pursuant to all

necessary building permits, are warranted for a period of ve (5) years from the date of

installation (i) to be free from defective materials and workmanship; and (ii) to perform in

accordance with the state performance requirements in effect on the date of installation.

This warranty extends only to the property owner. For purposes of this warranty, the [insert

product] System must be installed in accordance with all site conditions specied in the

Local Health Department Construction Permit and sized according to the Company’s

specications.

(b) System failures determined to be due to improper siting, excessive water usage,

improper grease disposal, improper installation, improper operation, or improper

maintenance are not part of this warranty.

Upon notication of a system failure, the Company may, at its option, perform or have

performed certain tests to determine the cause of failure. A registered soil scientist or

professional engineer may be used to evaluate the soil conditions and compare those

conditions with any original evaluation, which may appear on the permit.

In order to exercise these warranty rights, the property owner must notify the Company

in writing at its corporate headquarters within 15 days of discovery of the alleged defect.

The notice shall be accompanied by (i) a copy of the warranty which is signed and dated

by the installer and the property owner as set forth below; (ii) a copy of the appropriate

permit for the septic system; and (iii) proof to the Company’s satisfaction that the septic

tank has been maintained in accordance with the Company’s operating instructions. In the

event of a breach of warranty due to a failure of the trench, the Company will provide and

install [insert product] units as necessary to extend the size of the trench to provide a fully

functional wastewater system. The Company will not be responsible for pumps and any

other necessary mechanical devices needed to extend the trench.

(b) ARE EXCLUSIVE. THERE ARE NO OTHER WARRANTIES. ANY IMPLIED

WARRANTIES OF MERCHANTABILITY AND OF FITNESS FOR A PARTICULAR

PURPOSE SHALL NOT EXTEND BEYOND THE PERIOD IN SUBPARAGRAPH (a). THE

WARRANTY DOES NOT EXTEND TO INCIDENTAL, CONSEQUENTIAL, SPECIAL,

OR INDIRECT DAMAGES. THE COMPANY SHALL NOT BE LIABLE FOR PENALTIES

OR LIQUIDATED DAMAGES, LOSS OF PRODUCTION AND PROFITS, LABOR AND

MATERIALS, OVERHEAD COSTS, OR OTHER LOSS OR EXPENSE. SPECIFICALLY

EXCLUDED ARE DAMAGE DUE TO ORDINARY WEAR AND TEAR, ALTERATION,

ACCIDENT, MISUSE, ABUSE, OR NEGLECT; THE UNITS BEING SUBJECTED TO

STRESSES OR VEHICLE TRAFFIC GREATER THAN THOSE PRESCRIBED IN THE

INSTALLATION INSTRUCTIONS OR OPERATION INSTRUCTIONS; FAILURE TO

MAINTAIN THE MINIMUM GROUND COVERS SET FORTH IN THE OPERATION

INSTRUCTIONS; THE PLACEMENT OF IMPROPER MATERIALS INTO THE SYSTEM;

OR ANY OTHER EVENT NOT CAUSED BY THE COMPANY. THIS WARRANTY SHALL

BE VOID IF THE PROPERTY OWNER FAILS TO COMPLY WITH ALL OF THE TERMS

SET FORTH IN SUBPARAGRAPH (b).

FURTHERMORE, IN NO EVENT SHALL THE COMPANY BE RESPONSIBLE FOR ANY

LOSS OR DAMAGE TO THE PROPERTY OWNER, THE UNITS, OR ANY THIRD PARTY

RESULTING FROM THE INSTALLATION OR SHIPMENT OF THE UNITS, OR FROM

ANY PRODUCT LIABILITY CLAIMS OF THE ORIGINAL PROPERTY OWNER OR ANY

THIRD PARTY. THE COMPANY SHALL NOT BE RESPONSIBLE FOR ENSURING

THAT INSTALLATION OF THE SYSTEM IS COMPLETED IN ACCORDANCE WITH ALL

APPLICABLE LAWS, CODES, RULES, AND REGULATIONS.

(d) No representative of the Company has the authority to change this warranty in any

manner whatsoever, or to extend this warranty. No warranty applies to any party other

than to the property owner.

NOTICE OF SUBSTITUTION

This is to notify the Virginia Department of Health (“VDH”) that a ___ _(insert manufacturer’s

name and model # or description)_ ___ (“Substituted System”) will be substituted for the

gravel-type draineld system specied on the above-referenced sewage disposal system

construction permit.

I understand that the Substituted System is not the system designed by the

______________ County/City Health Department. The Substituted System, however,

is authorized for use in the Commonwealth of Virginia pursuant to VDH’s Guidance

Memoranda and Policy (GMP) #116. I further understand that the Substituted System

is covered by a manufacturer’s warranty and that such a warranty is not available for the

system prescribed by the County/City Health Department in the above-referenced permit.

I understand that, regardless of whether the Substituted System or the gravel-type

draineld system is installed, the Commonwealth of Virginia requires that the owner

maintain and preserve the entire approved absorption area (including reserve area where

applicable) that was required by the permit. This condition is intended to assure that any

absorption area that is not used will be available in the future should it become necessary

to repair or replace the System. I hereby agree that I will maintain and preserve the entire

absorption area as required.

WAIVER

As OWNER of the property described above and subject to the exception described

below, I hereby release and agree to hold harmless the Virginia Department of Health and

the Commonwealth of Virginia, including, without limitation, any and all of its agencies,

boards, and commissions, their insurer(s), ofcers, directors, employees, representatives,

and agents [hereafter referred to as the “COMMONWEALTH OF VIRGINIA”], from any

and all claims, complaints, demands, actions, causes of action, liabilities and obligations,

of whatever source or nature, whether administrative, legal or equitable, whether known

or unknown, which the OWNER now has or has in the future relating to or arising out of

the installation of the Substituted System including, without limitation, any and all claims

due to the failure of any person to comply with federal, state, or local laws or regulations,

claims under the Virginia Tort Claims Act, the Virginia Constitution, the United States

Constitution and amendments thereto, or under common law.

I understand that the COMMONWEALTH OF VIRGINIA does not warrant in any way

the performance of any System and that the manufacturer’s warranty is the sole remedy

available to me with respect to any performance deciency associated with a Substituted

System. Furthermore, I agree to rst seek and exhaust any and all remedies under the

manufacturer’s warranty before applying for indemnication under the Onsite Sewage

Indemnication Fund.

EXCEPTION—Onsite Sewage Indemnication Fund: I do not release the

COMMONWEALTH OF VIRGINIA from any liabilities, claims, or causes of action provided

under § 32.1-164.1:01 of the Code of Virginia (Onsite Sewage Indemnication Fund). I

acknowledge and afrm that the Onsite Sewage Indemnication Fund shall be the sole

remedy for failure of the Substituted System where such failure results from negligence

on the part of VDH. I also acknowledge and afrm that the Virginia Department of Health’s

authorization of the Substituted System pursuant to GMP #116 shall not constitute an act

of negligence pursuant to § 32.1-164.1:01 of the Code of Virginia.

This agreement shall be binding upon all subsequent owners of this property including any

and all HEIRS, SUCCESSORS, and ASSIGNS.

ACKNOWLEDGEMENT

I acknowledge that I have read this WARRANTY, NOTICE OF SUBSTITUTION, and

WAIVER and that I understand their terms. I also understand that there is no warranty if

I do not comply with all of the above steps or if the system is not installed or maintained

properly. I acknowledge to the Company that this warranty is part of my original agreement

to purchase the septic system and that the warranty and its limitations were provided to

me at the time of purchase.

Address of Installation Name (print) and Address of Property Owner:

________________________________________________________________________

Signature Date ___________________________________________________________

I acknowledge to the Company and the homeowner that the septic system and the [insert

product] units have been installed in accordance with GMP 116, the installation instructions

of the Company and in accordance with all state trench requirements and other applicable

laws.

________________________________________________________________________

Business Name of Installer Name (print)_______________________________________

Signature Date ___________________________________________________________

Notice of Substitution to be used when an AOSE or PE has specied a

Substituted System as part of a permit application.

2013 Virginia Mantis M5Design & Installation Manual Page 18 www.eljen.com

WARRANTY,

NOTICE OF SUBSTITUTION

AND

WAIVER OF LIABILITY

County/City of ____________________________________________________________

Sewage Disposal System Construction Permit ID # ______________________________

Tax Map # ____________________ or property description: ______________________

Owner __________________________________________________________________