Introduction; State-Specific Information - Infiltrator Presby Advanced Enviro-Septic Design And Installation Manual

1.0 INTRODUCTION

IMPORTANT CHANGES TO THE USE OF ADVANCED ENVIRO-SEPTIC IN MISSOURI
The Missouri Department of Health and Senior Services (DHSS) has approved a number of critical changes to the
way in which the Advanced Enviro-Septic System (AES) is to be designed, permitted and installed in Missouri. The
changes are effective September 1, 2020 and will remain in effect until further notice.
ALL OF THESE CHANGES ARE INCORPORATED INTO THIS MANUAL.
PLEASE READ, UNDERSTAND AND INCORPORATE/PRACTICE THESE CHANGES BEFORE DESIGNING
1.1 Missouri State-Specific Information
System Type
The AES is approved for use as an experimental system. In every instance the property owner(s) must:
•
be made aware of this fact before purchasing an AES system;
•
sign a form acknowledging that they understand this fact; and
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allow DHSS and Presby Environmental (PEI) or Infiltrator Water Technologies (Infiltrator) personnel onto
their property to investigate system function.
The AES is a combined treatment and dispersal system (CTDS), a system type which is not specifically addressed in
19 CSR 20-3.060 (the Rules). It shall be designed, permitted, and installed in accordance with the requirements
and exceptions listed below. If there are questions about design specifications, please contact your local health
department or Presby Environmental (PEI) for assistance at (800) 473-5298.
System Design
Design of the AES shall comply with the following:
•
the soil type and soil loading rate (SLR) must be established by a soil morphology evaluation;
o
the AES system shall not be permitted for installation and use in IVb soils.
•
the minimum total absorption area is determined by utilizing the soil loading rates in Table A in Section
2.1 below, which are based on Tables 13 and 14 in the Rules;
•
a minimum vertical separation distance of 1 foot (ft) is required:
o
there must be a minimum of 12 inches (in) of naturally occurring suitable or provisionally suitable
soil below grade at the location of the system on the site for the AES to be permitted; and
•
AES pipe rows in a given bed shall be designed and installed at the same elevation (level to one another);
•
serial distribution is not allowed;
•
a Missouri-licensed engineer is required for design if either:
o
the SLR is less than or equal to (≤) 0.29 gallons per day per square foot (gpd/ft
o
any aspect of the AES (18 in tall – 6 in of system sand plus the 12 in diameter pipe) is at grade or
above grade.
© Presby Environmental, Inc., Design & Installation Manual, September 2020 Edition
NEW FOR 2020
AND/OR INSTALLING AN AES SYSTEM
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