Connection to sewers on new build

Effects

Apologies for the long post but I'm looking for some advice regarding connections to foul sewer and surface water sewer in Dublin City Council area.
Our architect and engineer say that we need to get the sewers inspected on the public road ahead of making connections to make sure they are up to scratch.

Dynorod cost for this is €440 plus vat.
I would have thought that this would be the remit of DCC and Irish Water, and covered under the DCC Levy/Irish Water charge.

Engineer says it is a requirement to have them inspected and DCC observe.

From the DCC engineer list of requirements:
7. Dublin City Council’s Drainage records are indicative and must be verified on site. The Developer must carry out a comprehensive site survey to establish all drainage services that may be on the site. If drainage infrastructure is found that is not on Dublin City Council’s records the Developer must immediately contact Dublin City Council's Drainage Division to ascertain their requirements. Detailed “as-constructed†drainage layouts for all diversions, extensions and abandonment of the public drainage network; in both hard and soft copy in an approved format; are to be submitted by the Developer to the Drainage Division for written approval. See section 5 of the above-mentioned Code of Practice for more details.

I rang the DCC engineer and asked to confirm that we need the inspection carried out on the public road, he passed me on to the drainage department whom I'm awaiting a reply from.

The foul sewer comes under the remit of Irish Water and when I spoke with them they didn't fill me with confidence as to knowing what they were talking about.
They have noted my engineers concerns and said their engineer will inspect the sewers when he makes it out.

So where do I stand? Do I spend €540 to have this survey carried out or can I just wait for DCC and Irish Water to do their own inspections?

It just seems that with building there's extra expenses the crop up often. We are already stretched as it is.

Here's the drainage plan. Blue is public road, yellow is private lane with our house below that.

Gumbo

What does your grant of permission say?
Drainage have an input into the planning stage and will usually specify in the planning conditions that written approval is obtained from them prior to commencement or that you must comply with the greater Dublin region code of practice for drainage works.

Do you need to put in a soak out or attenuation tank?
Usually new dwellings have to be restricted to 2L/S on entry to the public system and your engineer is quite right on getting a CCTV Survey as he is the one that is certifying it as ok to take the additional discharge.

Also, DCC have to make the connection to the system so that will
Cost a bit.

Most new dwellings (one off) in inspecting have a soakpit to avoid the surface water connection.

con1982

If the drain is going under a public road, DCC engineers usually insist on 225dia drains. They might not allow the connection if you build 100dia drains.

Johnnyhpipe

What you need is confirmation of the invert levels. Not to determine the condition of the public sewer network. Engineer should be advising you on this.

Effects

Johnnyhpipe wrote: »

What you need is confirmation of the invert levels. Not to determine the condition of the public sewer network. Engineer should be advising you on this.

Engineer has advised we have a CCTV inspection of the sewer, this doesn't sound like it confirms invert levels.

kceire wrote: »

What does your grant of permission say?
Drainage have an input into the planning stage and will usually specify in the planning conditions that written approval is obtained from them prior to commencement or that you must comply with the greater Dublin region code of practice for drainage works.

Do you need to put in a soak out or attenuation tank?
Usually new dwellings have to be restricted to 2L/S on entry to the public system and your engineer is quite right on getting a CCTV Survey as he is the one that is certifying it as ok to take the additional discharge.

Also, DCC have to make the connection to the system so that will
Cost a bit.

Most new dwellings (one off) in inspecting have a soakpit to avoid the surface water connection.

I'll have to double check the permission.
They have said we'll have to comply with code of practice and have outlined what this is.
Attenuation tank is in place.
When you say soakpit, does this mean it would have avoided the surface water connection? We have a tight site so maybe this wasn't feasible for our development.

Regarding our engineer certifying DCC sewers, I guess I thought it would be up to DCC to confirm their sewers were appropriate. It seems it's not.

Dynorod also quoted him a higher price for the survey than they quoted me, which I'm not that happy about.

Effects

DCC engineer just called me. He's sending out a CCTV crew to do the inspection. They'll also check the foul sewer while they are there.

Effects

con1982 wrote: »

If the drain is going under a public road, DCC engineers usually insist on 225dia drains. They might not allow the connection if you build 100dia drains.

DCC have already accepted the drainage plan in principle. Is the diameter something I need to worry about?

Gumbo

Effects wrote: »

DCC have already accepted the drainage plan in principle. Is the diameter something I need to worry about?

Is all stipulated in the Code of Practice. Your engineer should be well aware of it but no harm confirming to make sure it's addressed before it goes into the ground.

Effects

It seems my engineer has specced the drainage system incorrectly. The builder has completed some of the work incorrectly as a result. This is going to end up costing more than anticipated to rectify. Do I have any come back with the engineer?

DCC want us to put in two block manholes in the garden measuring 1.2 x 1.2 metres each. This was the standard pre 2016, when we obtained planning permission, and they won't allow us to build manholes to the current standard.

Effects

After speaking with the engineer I'm now in a place where I'm dealing directly with the drainage division in the council and the builder.
I luckily haven't yet paid the engineers bill and won't.