© Presby Environmental, Inc., Maine Design & Installation Manual, June 2019 Edition -8-
Step #4:
The site will accommodate a row length of 65 ft, which will require 8 rows (517 ft ÷ 65 ft.).
Step #5:
Using a row length of 65 ft. and 1.5 ft. row spacing, Table C shows 8 rows will be required at this row length
to provide the minimum pipe needed. In this example 520 ft. will be used. The pipe layout width for 8 rows is 11.5 ft.
Step #6:
A 3 ft. system sand extension is required on the downslope side of the field because the bed slope is
greater than 10%. The final sand bed width = 11.5 ft (PLW) +1 + 3 = 15.5 ft.
Illustration of example #2:
Design Example #3
: Commercial System, Design criteria: daily design flow =1,435 GPD, Soil Profile 2, site is flat,
use Multi-Level™ configuration.
Step #1
AES or ES pipe required for 1,435 GPD in Profile 2 soils from Table E = 1,048 ft. Take the pipe required for
each 100 GPD (73 ft.) from the commercial column and multiply by 14.35 (1,435/100 x 73 = 1,048 ft.). This system
will require (3) serial sections (1,435 GPD ÷ 500 GPD/section = 3).
Step #2:
Minimum row spacing for a level bed and Profile 2 soils from Table F = 2.00 ft.
Step #3:
Minimum number of serial sections → 1,435 GPD ÷ 500 = 2.9, use at least 3 serial sections.
Step #4:
The site will accommodate a row length of 90 ft. This will require 12 rows and can be evenly divided into 3
serial sections (4 rows per section).
Step #5:
Using a row length of 90 ft. and 2 ft. row spacing, Table G shows (12) rows will be required and will provide
1,080 ft. of pipe. Table G also shows the Pipe Layout Width will be 12 ft. This bed will have (6) rows in the upper level
and (6) rows in the lower level. There will be (4) rows in each section, two in the upper level will feed two rows in the
lower level.
Step #6:
this system is being constructed level, so there will not be a system sand extension.
Notes: Contact technical support for assistance with any Multi-Level™ system. All Multi-Level™ systems require
venting regardless of the pipe model being used.
11.0 AES & ES Standards and Technical Support
All AES and ES Systems must be designed and installed in compliance with the procedures and specifications
described in this Manual and in the product’s Maine approval. This Manual is to be used in conjunction with the State
of Maine Department of Health and Human Services Administrative Rules. In the event of contradictions between this
Manual and Maine DHHS regulations, Presby Environmental, Inc. should be contacted for technical assistance at
(800) 473-5298. Exceptions to any Maine rules other than those specifically discussed in this Manual require a state
waiver.
12.0 Advanced Enviro-Septic and Enviro-Septic Sizing
AES and ES use the same bed sizing tables, pipe and installation requirements noted in this manual. See para. 14.1,
below for additional Advanced Enviro-Septic requirements.