GREEN ENVIRONMENT PLAN

7/29/2019 GREEN ENVIRONMENT PLAN

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December 2008

Prepared By


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Project Quality Control Sheet

ORIGINAL Author Checked by Approved by

Signature

Date 10/12/08 10/12/08 10/12/08

Company Aardvark EM Ltd Aardvark EM Ltd Aardvark EM Ltd

Location: X-Fab, Tamerton Road, Roborough, Plymouth

Grid Reference: ST502625

Project Manager: N C Leaney BSc Hons MRICS FGS

Report Author: A Robbins MSc AMI BIOL AIEMA

L S Errington MSci PGCE

N C Leaney BSc Hons MRICS FGS

Report Number: 792-3201

Report Status: Draft

Copyright: All copyright in this document is reserved.

Liability: This document contains information and may contain conclusions and

recommendations. Every effort has been made to ensure that the information

is accurate and that the opinions expressed are sound. However, Aardvark EM

Limited cannot be made liable for any errors or omissions or for any losses or

consequential losses resulting from decisions based on the information.

Report Written and Produced By

Aardvark EM Limited, Higher Ford, Wiveliscombe, Taunton, Somerset, TA4 2RLTelephone: 01984 624989, Facsimile: 01984 623912

Email: [email protected], Web: www.aardvarkem.co.uk


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Contents

1 Introduction ........................................................................................................................12 Design .................................................................................................................................2

2.1 Use ..............................................................................................................................22.2 Amount, Layout and Scale ..........................................................................................22.3 Landscaping ................................................................................................................22.4 Operation.....................................................................................................................2

2.4.1 Effluent Treatment Plant (ETP)...............................................................................22.4.2 Reedbed System.....................................................................................................32.4.3 Attenuation Lagoon.................................................................................................32.4.4 Discharge from Site.................................................................................................32.4.5 Recirculation ...........................................................................................................3

2.5 Appearance.................................................................................................................43 Access.................................................................................................................................4


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792- 3201 Design & Access Statement

Aardvark EM Limited December 2008 Page 1

1 Introduction

This design and access statement is written in support of the planning application for a

proposed reedbed at X-Fab, Tamerton Road, Roborough, Plymouth to provide a sustainable

drainage system for the discharge of the treated effluent water from the on-site

manufacturing operation.

The statement covers both the design principles and concepts that have been applied to

the proposed development such as scale, layout, landscaping and appearance and how

issues relating to access have been considered.


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2 Design

2.1 Use

The X-Fab operation at Tamerton Road, Roborough, Plymouth comprises a semi conductorfactory and as a result of the production process, it produces a significant volume (890m3 a

day) of waste water effluent. At present this water is treated in an on-site effluent treatment

plant and discharged into the South West Water sewer main.

The proposal set out in this application is to provide additional on site treatment after passing

the water through the existing effluent treatment plant into a new treatment system

comprising two reedbeds and an attenuation lagoon before discharging into the local

watercourse, a tributary of the River Plym. This is considered to be more sustainable and in

accordance with the Environment Agencys considerations of Best Available Technique for

effluent treatment (BAT).

2.2 Amount, Layout and Scale

The application comprises the site area within the red line as shown on Drawing 792-2164

and described in more detail in the Supporting Planning Statement (Ref 792-3198).

The total area of the X-Fab operation is approximately 4.75 hectares (Blue Line) of which

approximately 0.40 hectare comprises the site area of the application for the proposed

permanent reed bed and attenuation pond as shown on the application site plan (.

The two reedbeds are approximately 21 x 5m each with the attenuation lagoon having a

surface area of approximately 1,600m2.

The area proposed for the reedbeds is defined as disturbed bare earth leading to an area of

herb rich meadow which is to be the location of the proposed attenuation lagoon.

2.3 Landscaping

The reedbed and lagoon will have a secondary function as an amenity area for staff from the

factory and to be of potential educational benefit for groups touring the factory and facility.

Post development, vegetation management will be required across the entire development

site to ensure continued performance of the treatment system, efficient operation and

aesthetics of the lagoon. The structural integrity of the reedbeds and lagoon will be

monitored and maintenance scheduled when required.

2.4 Operation

Effluent will be treated via the existing effluent treatment plant (ETP). The partially treated

effluent will then forward flow via gravity to the two reedbeds and to an attenuation lagoon

before being discharged in to a tributary of the River Plym.

2.4.1 Effluent Treatment Plant (ETP)

Connection will be made to the existing ETP discharge system to the west of the main X-Fab

factory. Two 150mm pipes will carry the flow from the ETP, west of main factory, to thereedbed system, north of main factory. These pipes will be recessed in an existing covered


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gully running the length of the west and north sides of the factory. Pipes will exit the gully to

the north of the main factory and carry flow to the reedbed system.

2.4.2 Reedbed System

The reedbed system will comprise two horizontal flow reedbeds (21.36m x 5.04m each)constructed in an east-west orientation. These will be offset from each other to also allow

flow via gravity from one to the other.

Each reedbed will be constructed from galvanised steel I-beams set vertically in to the

ground with wooden beams slotted between the I-beams to form the structure of each bed.

The internal void will be lined with an EDPM impermeable liner. The internal matrix of the

reedbed system will comprise synthetic BioBlocks planted with Phragmities australisreeds.

Effluent will enter the reedbed through a launder channel (0.9m x 5.04m approx.) and weir

over into the main reedbed section via a V-notched wall, flowing by gravity across the length

of the system. Outflow from each reedbed will be to a discharge control point, from which

flow can be directed onwards to the attenuation lagoon, back to the original inflow point or

recirculated through the system again.

2.4.3 Attenuation Lagoon

Located to the north east of the main factory the attenuation lagoon will receive the treated

effluent at its north western corner. Covering an area of 1,600m2 (approx.) with a depth of

2.2m, the lagoon will be constructed with 1:3 sloping sides and lined with an impermeable

EDPM membrane to retain water. Marginal planting will be placed along the lagoon sides to

landscape the feature. Outflow will be through a 300mm OD pipe to the southwest of the

lagoon located 1.5m below ground level. Outflow will be to a discharge control point, from

which flow can be directed onwards to the discharge point, back to the original inflow point or

recirculated.

2.4.4 Discharge from Site

Outflow from the reedbeds will be through the existing storm water drain leading to a

tributary of the River Plym.

The discharge pipe is 500mm ID, sized to accommodate both the supplementary flow of

890m3 a day from the reedbed and the existing storm water run off from the site. The pipe

has also been sized to provide some additional capacity for fluctuations in flow volume from

both sources.

2.4.5 Recirculation

Each part of the system (reedbed or lagoon) will have discharge control points from which

water flow can be directed onwards, back to the original inflow point or recirculated back to

the start of that part of the system. Onward flow will be directed via gravity through the

system. Recirculated flow will be directed via pumping systems, comprising duty and back-

up pumps.


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2.5 Appearance

The site currently comprises a barren area of disused waste ground with few discernable or

notable features save for a Devon bank which runs adjacent to the proposed attenuation

lagoon but does not form part of the application site and will remain undisturbed by the

proposal. A disused car parking area is situated to the north surrounded by low value

amenity grassland.

Post development the reedbed system and attenuation lagoon will enhance the visual

character of this part of the X-Fab site providing additional landscaping to a currently barren

area of the site.

3 Access

The site will be accessed via the existing secure site access from Tamerton Road.

Internally, existing estate roads will provide vehicular access for construction and post

development maintenance and pedestrian routes will utilise existing walkways.

Access for the main factory and development site is restricted and controlled by security

fencing and security personnel; the only access is via the security gate to the south of the

main factory. Staff and visitor parking will be provided within existing car parking provision

on-site.

It is not considered necessary to build any further access points to the site as part of this

proposal.

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