RE: CRS Activity 450 SMR (6)Dave,
Attached is the contract with the scope highlighted. This is an annual contract renewable for up to five years. We are on the last year so we will be rebidding next year. The way it
works is I let the contractor inspect the creeks on their own and if they find something let me know and then I will pay them to take it out. So if they want to work and make money they
usually travel the creeks every few months and come up with a list of areas, I take a look at the areas and if trees/trash/debris needs to be removed, I have them remove them and then
I check on it after before I pay their invoice. I also send them out based on complaints from homeowners. The newest thing we have been using is the drone, its easier to inspect the
creeks without having to get in a boat. We record video of the creek and then determine what needs to be done, we inspect outfalls/headwalls and blockages. I hope this helps,
If you have any questions, please contact me at your convenience.
Thanks,
Mike
From: Dave Carlton [mailto:dave@dkcarlton.com]
Sent: Thursday, August 20, 2015 11:55 AM
To: Michael Garza <MGarza@coppelltx.gov>
Cc: Deidra Mares (dmares@iso.com) <dmares@iso.com>; Kyra Jansen <KJansen@coppelltx.gov>
Subject: RE: CRS Activity 450 SMR
Mike – you mention that you have a contractor to inspect the creeks and channels. Do they do this at least annually? If so their scope of work can suffice for the written procedures.
We would still need copies of inspection records of the creeks and channels. Since you are dealing with a contractor how do you know they have inspected what they are supposed to have
inspected? Whatever they provide you might be sufficient for our requirements.
I’ll look at the example soon.
Dave
Dave Carlton, PE CFM D.WRE
dkcarlton & associates, PLLC
4040 NE 204th ST
Lake Forest Park, WA 98155
206-604-7533
dave@dkcarlton.com <mailto:dave@dkcarlton.com>
From: Michael Garza [mailto:MGarza@coppelltx.gov]
Sent: Thursday, August 20, 2015 9:30 AM
To: Dave Carlton
Cc: Deidra Mares (dmares@iso.com <mailto:dmares@iso.com> ); Kyra Jansen
Subject: RE: CRS Activity 450 SMR
Dave,
Attached is a plan sheet showing detention. Im not sure we have any development less than one acre that has detention. As far as routine inspections on storm drain system. We do inspect
them annually but we do not have a written procedure or policy to follow. We have our public works crew periodically inspect different areas of the city. They also inspect on a complaint
or concern basis. We do have a contractor that we have hired to inspect the creeks and drainage channels for debris/trees that are potential blockages of the flow. We do that periodically
and on a complaint basis as well but we do not have a written standard operating procedure. We have recently started flying a drone through our creeks to look for blockages and fallen
trees that could cause a problem. I have attached the 540EHP form. I have also attached our floodplain ordinance that talks about blockages of waterways highlighted in yellow.
If you need any clarification or more information, please let me know.
Thanks,
Mike
From: Dave Carlton [mailto:dave@dkcarlton.com]
Sent: Tuesday, August 18, 2015 1:23 PM
To: Michael Garza <MGarza@coppelltx.gov <mailto:MGarza@coppelltx.gov> >
Cc: Deidra Mares (dmares@iso.com <mailto:dmares@iso.com> ) <dmares@iso.com <mailto:dmares@iso.com> >; Kyra Jansen <KJansen@coppelltx.gov <mailto:KJansen@coppelltx.gov> >
Subject: RE: CRS Activity 450 SMR
Mike – I’m late with this request, but can you send me a few plan sheets for small development, less than one acre, that shows them meeting your criteria? Especially something that
includes detention. Thanks.
Dave
Dave Carlton, PE CFM D.WRE
dkcarlton & associates, PLLC
4040 NE 204th ST
Lake Forest Park, WA 98155
206-604-7533
dave@dkcarlton.com <mailto:dave@dkcarlton.com>
From: Michael Garza [mailto:MGarza@coppelltx.gov]
Sent: Wednesday, June 17, 2015 11:02 AM
To: Dave Carlton
Cc: Deidra Mares (dmares@iso.com <mailto:dmares@iso.com> ); Kyra Jansen
Subject: RE: CRS Activity 450 SMR
Dave,
I apologize for not getting back to you sooner. We have been very busy with all the rain we have had down here. Im not sure if this is what you are looking for but this is what we have
and what we do. Our requirement is any and all new developments are required to meet the criteria of designing for the fully developed 100 year storm event. We ask that they show
on their plans that the existing storm drain system they are tying into has the capacity to accommodate the 100 year fully developed storm event from their site. If it does not then
they are required to detain onsite. We do not ask for a drainage report, it is just shown on their plans. The only time we ask for a report is when they do a CLOMR, and we require no
rise in the water surface elevation of fully developed 100-year floodplain
Please let me know if you need anything else.
Thanks,
Mike
From: Dave Carlton [mailto:dave@dkcarlton.com]
Sent: Tuesday, May 26, 2015 3:51 PM
To: Michael Garza
Cc: Deidra Mares (dmares@iso.com <mailto:dmares@iso.com> ); Kyra Jansen
Subject: RE: CRS Activity 450 SMR
Thanks Michael. The Design Manual helps to clarify the design storms used. From what I have I’m unable to determine to what size of development these standards would apply. For instance
– single family residence on an existing lot, new subdivision, any development creating 10,000 sf of new impervious surface, any new development of 5 acres or greater. Do you have such
a standard and where would I find it?
Also, I’m going to need five examples of how new development met the criteria. Typically this would be contained in a drainage report submitted by the developer I don’t need the models
or the plan sheets, but rather the text describing the development and showing that the post development 5-year and 100-year flows meet the criteria.
Thanks for the help.
Dave
Dave Carlton, PE CFM D.WRE
dkcarlton & associates, PLLC
4040 NE 204th ST
Lake Forest Park, WA 98155
206-604-7533
dave@dkcarlton.com <mailto:dave@dkcarlton.com>
From: Michael Garza [mailto:MGarza@coppelltx.gov]
Sent: Tuesday, May 26, 2015 12:29 PM
To: Dave Carlton
Cc: Deidra Mares (dmares@iso.com <mailto:dmares@iso.com> ); Kyra Jansen
Subject: RE: CRS Activity 450 SMR
Dave,
Please see attached dallas design manual. This is what we follow for design. The peak runoff rate from a 5-year event as well as the 100 year event must be held to the pre-development
rate.
Deidra, you should be receive the rest of the requested items within the next day or so.
Let me know if you need anything else.
Thanks,
Michael Garza, P.E.
Assistant Director of Engineering
Engineering Department
City of Coppell, TX
<http://www.coppelltx.gov> www.coppelltx.gov
972-304-7019 (office)
<http://www.coppelltx.gov/>
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cocoppell-522.html>
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From: Dave Carlton [mailto:dave@dkcarlton.com]
Sent: Friday, May 22, 2015 11:18 AM
To: Michael Garza
Cc: Deidra Mares (dmares@iso.com <mailto:dmares@iso.com> ); Kyra Jansen
Subject: RE: CRS Activity 450 SMR
I appreciate the update and next week would be great. Thanks for letting me know.
Dave
Dave Carlton, PE CFM D.WRE
dkcarlton & associates, PLLC
4040 NE 204th ST
Lake Forest Park, WA 98155
206-604-7533
dave@dkcarlton.com <mailto:dave@dkcarlton.com>
From: Michael Garza [mailto:MGarza@coppelltx.gov]
Sent: Friday, May 22, 2015 6:47 AM
To: Dave Carlton
Cc: Deidra Mares (dmares@iso.com <mailto:dmares@iso.com> ); Kyra Jansen
Subject: Re: CRS Activity 450 SMR
I apologize, I am out if the office again this week, I will have everything to you next week after the holiday.
Thanks
Michael Garza, P.E.
Assistant Director of Engineering
City of Coppell
972-304-7019
On May 21, 2015, at 4:59 PM, Dave Carlton <dave@dkcarlton.com <mailto:dave@dkcarlton.com> > wrote:
Hello Michael. I have been reviewing the documentation forwarded to me for Stormwater Management Credit. As you know, credit is dependent upon both the size of development regulated
and the design storm(s) used. Your March 19 email to her states the design storm can be found on page V-1 of the stormwater management study. That page only discusses Floodway Capacity
and Channelization issues, not design storm for control of excess runoff from new development. What we are looking for are not design standards for conveyance facilities, but rather
to what standard due you require new development to match the pre-developed flows from the site. For instance, are they required to release the flows from a 10-year storm at no greater
rate than existed prior to development? I could find no such standard on your website or in the documents that were sent to me.
You also mentioned that the you follow the Dallas Design Manual. I do not have a copy of the manual to review. Do you know if it is online?
Thanks for your help.
Dave
Dave Carlton, PE CFM D.WRE
dkcarlton & associates, PLLC
4040 NE 204th ST
Lake Forest Park, WA 98155
206-604-7533
dave@dkcarltoncom <mailto:dave@dkcarlton.com>