Tricel Sewage Treatment Plant Installation in Cheshire: Solving Drainage Field Compliance Issues

Case Study
Written By Alex Griffiths

A client in Cheshire contacted Envirocare Off Mains after receiving an unsatisfactory installation quote for their wastewater treatment system. The original contractor had proposed installing a Tricel PE06IPS sewage treatment plant without completing essential compliance work. There had been no porosity test and no calculations for inlet invert depth, pumping head, or discharge distance.

Our team stepped in to deliver a fully compliant installation that met Environment Agency binding rules and satisfied Building Control requirements.

The Problem: Non-Compliant Installation Proposal

The client's initial quote raised several red flags:

  • No porosity test completed – essential for determining drainage field size and suitability

  • Missing technical calculations – inlet invert depth, pumping head, and effluent transfer distance not assessed

  • Regulatory non-compliance risk – installation would likely fail Building Control inspection

Without proper site assessment, the proposed system risked environmental non-compliance and costly remedial work.

Our Solution: Comprehensive Site Survey & Compliant Installation

1. Site Survey & Porosity Testing

We conducted a thorough site assessment, including percolation testing to determine soil drainage characteristics. Results showed 32 linear metres of drainage field would be required for compliant effluent disposal.

2. Technical Calculations

Our engineers calculated:

  • Inlet invert depth for proper flow

  • Pumping head requirements for the site topography

  • Transfer distance from treatment plant to drainage field

3. Tricel PE06IPS Installation

We installed the client's Tricel sewage package treatment plant according to manufacturer specifications and regulatory requirements.

4. Rising Main & Drainage Field

A rising main was installed to transfer treated effluent from the Tricel unit to the newly constructed drainage field, ensuring compliant discharge.

Building Control Approval & Certification

The entire installation was supervised in accordance with the client's Building Inspector's authorisation. Upon completion, the system passed inspection and was certified compliant with:

  • Environment Agency binding rules for off-mains drainage

  • Building Regulations Part H (Drainage and waste disposal)

  • General Binding Rules for small sewage discharge

Why Choose Envirocare Off Mains for Sewage Treatment Installation?

  • 30 years' experience in off-mains drainage (established 1995)

  • Full compliance with Environment Agency and Building Control requirements

  • Complete service – site survey, porosity testing, technical design, installation, and certification

  • Installer and supplier for leading UK manufacturers Tricel, Graf, Biorock, and other leading brands

Need Help with Sewage Treatment Plant Installation in Cheshire?

If you've received a quote that doesn't include porosity testing, technical calculations, or Building Control liaison, contact Envirocare Off Mains for a compliant solution.

Call: 01270 442442
Email: info@envirocareom.com

Alex Griffiths
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