Dear Customer,

Thanks for your email. We’re on the case and will respond within 10
working days.

If you need to contact us, call 0330 303 0277 (Calls charged at local
rate) between 8am–7pm, Monday to Friday and from 8.30am–2pm on Saturdays,
or check out our website [1]https://www.southernwater.co.uk/

Please don’t reply as this is an automatic message.

Thanks,

The Southern Water Customer Service team

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Emily Mott Our Ref:
[1][FOI #439972 email] 8001332733

 
  Date:
  26 October 2017
  Contact:
  Tel: 01273 663406
  Fax: 01903 691435
   

Dear Ms Mott

TThe he Environmental Information Regulations 2004

Request for Information

Water abstraction methods

Thank you for your email sent on 21 October 2017, regarding the
Environmental Information you have requested.

I have passed your request to the relevant department to look into. As
required by the legislation, we aim to respond to your request within 20
working days from the date received.

If for any reason we are unable to meet this deadline, we will keep you
informed on our progress. With this is mind, I will contact you again no
later than 17 November 2017, with an update.

If you have any further questions or concerns, you can contact me directly
on 01273 663406. I am available Monday to Friday from 9am to 5pm.

Please do not reply to this  correspondence as it has been sent from an
automated address. If you would to reply to me by email,
please  contact [2][Southern Water request email] quoting the above
reference number.  

Yours sincerely

Leslie Ibegbulem

Customer Solutions Case Handler

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Emily Mott Our Ref:
[1][FOI #439972 email] 8001332733

 
  Date:
  17 November 2017
  Contact:
  Tel: 01273 663406
  Fax: 01903 691435
   

Dear Ms Mott

TThe he Environmental Information Regulations 2004

Request for Information

Water abstraction methods

I write further to my email sent on 24 October 2017.

We have dealt with your request under the Environmental Information
Regulations 2004. For ease of reference, I will provide the response to
your questions, with the answers below as follows:

As a rule, drilling methods and drilling fluids are largely dependent on
the rock or formation being drilled, the borehole diameter and the
proposed drilling depth. From a Southern Water perspective, the methods
and choice of materials can be important as we need to consider both the
general environmental regulations but also the separate drinking water
quality regulations. This may be with respect to the actual well being
drilled, and/or other nearby operational abstraction wells.  

To what depth do you plan to drill these wells?  

The proposed new water supply wells at Hardham will be less than c. 100m
deep, and the proposed trial Aquifer Storage Recovery (ASR) well within
the Sompting area is anticipated to be c. 400m deep.

Please specify type and quantity of drilling fluids used?

The details have yet to be finalised with contractors regarding the
upcoming Southern Water well drilling works, so the exact choice and
anticipated volume of drilling fluid is not yet known. However, these will
be public water supply wells drilled within aquifers used for this
purpose. Water flush is a general preference whenever feasible and for
drilling through chalk formations water flush by itself is often
sufficient, and usually utilises native groundwater (from an existing
nearby well in the same aquifer) or drinking water from nearby water mains
or water supply works.

Drilling shallow or deep wells through sandstone aquifers is more likely
to require a drilling mud.  If the drilling work does require additives to
the drilling fluid, to aid the removal of drilled material and/or support
a drilled hole wall, then we would expect these to comply with Regulatory
Environmental Guidance with respect to the aquifer, but to also minimise
any potential risks with regards to separate Drinking Water Quality
Standard’s (if an operational well is nearby). Some typical industry
drilling fluid additives are attached. Where they are necessary,  we would
typically prefer to see the use of additives that degrade and/or that
provide minimum short term impact with regards to subsequent water quality
analysis.  

3. What chemicals will you use to clean out the borehole and to "maximise"
the flow of water? 

The details have not been finalised with  our drilling contractors, but
the attached information includes some typical ‘well/bore cleaners’ used
to help disperse clays and polymers built up on the well/bore wall
(drilling mud cake). Though some biodegradable carbohydrate and/or
vegetable oil based additives (re: drilling fluids and or subsequent bore
cleaners) can still sometimes contribute to ‘false’ laboratory detects or
issues regarding Hydrocarbon compounds,  so a simpler approach based
around mineral based compounds and/or inorganic acid cleaners may
generally be preferred.  All substances used would typically be expected
to comply with regulatory guidance.

4. Please list quantities and type of chemicals and acids used in the
water abstraction process including volume. Please list volume percent
Concentration of acid used ( for example is it HCl at 7% or 15%) Please
list all chemicals used (corrosion inhibitors, etc). 

We do not have this exact detail yet. Acids and dispersants can be
circulated within the well on completion of drilling,  and the well is
then cleared to waste for a period. This is done  to help clear the mud
cake remaining on the well walls and/or clear the filter pack placed
immediately beyond the well screen. But this principally targets the well
itself as a structure. Further well/aquifer development would then be
expected to take place using traditional water well development methods
(swabbing, surging and just pumping the well) to help best develop the
immediate filter pack, near aquifer and remove fines.  

As a note, hydrochloric acid (HCl) can also be used as a part of the
development methods for chalk water supply wells, though in this case it
is to help enlarge the chalk fractures within the near aquifer to the well
to help improve yields. Typically 5 cubic meters of c. 35% HCl might be
expected to be used in these situations (i.e.  a chalk water supply well
development option). Though in this instance, we will be drilling through
the chalk and into the underlying lower greensand aquifer for the ASR test
well, we are not targeting the chalk as an aquifer itself.  And so
addition of acids (or other fluids)  to target and develop the wider
aquifer is not proposed (or necessary).

5. How do you put the treatment fluids into the ground and at what
pressure?

The chemicals are not put in under pressure into the ground. We use a
normal safe practice.

6. Do you use a different drilling mud when drilling through chalk in
Source Protection Zones versus non protected zones? 

The choice of drilling fluid or mud is dependent on the geology, the well
 diameter and depth.  By its nature water supply well drilling works often
end up being within our own or a nearby SPZ1, where there may be other
wells operational. For these reasons we have a safe control of operations
procedure (with regards to other abstraction wells). This may involve
temporary cessation of pumping at other wells and/or increased monitoring
at these sites. And the principle choice of the drilling fluid used (and
well/bore cleaning fluid if relevant) would be expected to be both
compliant with the environmental regulations,  but to also minimise risks
regarding separate drinking water quality regulations.  Strict standards
for the quality of the UK public supply are laid down in national
regulations, (Water Supply (Water Quality) Regulations 2016,
[2]http://www.legislation.gov.uk/uksi/2016/..., derived
from the EU Drinking Water Directive. These standards are based on advice
from the World Health Organization (WHO) and are regularly reviewed.

If you are dissatisfied with the handling of your request, you have the
right to ask for an internal review. Internal review requests should be
submitted within forty working days of the date of receipt of this
response and should be addressed to Robin Churchill, Southern Water
Services Ltd, Southern House, Yeoman Road, Worthing, West Sussex BN13 3NX.

If you are dissatisfied with the outcome of the internal review, you can
apply, without charge, to the Information Commissioner, who will consider
whether Southern Water has complied with its obligations under the
Regulations, and can require Southern Water to remedy any problems. You
can find out more about how to do this, and about the Regulations in
general, on the Information Commissioner’s website at: [3]www.ico.org.uk .
Complaints to the Information Commissioner can be made via the "report a
concern" section of the Information Commissioner's website.

If you have any further questions or concerns, I would be very happy to
talk with you on my direct line of 01273 663406. I am available Monday to
Friday from 9am to 5pm.

This correspondence has been sent from an automated address. If you would
like to reply to me by email,
please  contact [4][Southern Water request email] .

Yours sincerely

Leslie Ibegbulem

Customer Solutions Case Handler

This e-mail is intended solely for the person or organisation to which it
is addressed. It may contain privileged and confidential information. If
you are not the intended recipient, you are prohibited from copying,
disclosing or distributing this e-mail or its contents (as it may be
unlawful for you to do so) or taking any action in reliance on it. If you
receive this e-mail by mistake, please delete it then advise the sender
immediately. Without prejudice to the above prohibition on unauthorised
copying and disclosure of this e-mail or its contents, it is your
responsibility to ensure that any onward transmission, opening or use of
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onward recipients' systems or data. Please carry out such virus and other
such checks as you consider appropriate. An e-mail reply to this address
may be subject to monitoring for operational reasons or lawful business
practices. This e-mail is issued by Southern Water Services Limited,
company number 2366670, registered in England and having its registered
office at Southern House, Yeoman Road, Worthing, BN13 3NX, England. In
sending this e-mail the sender cannot be deemed to have specified
authority and the contents of the e-mail will have no contractual effect
unless (in either case) it is otherwise agreed between Southern Water
Services Limited and the recipient.

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