HomeMy WebLinkAboutWPO201700048 Correspondence 2021-07-22 (2)Graham Murray
From: Frank Pohl <fpohl@albemarle.org>
Sent: Thursday, March 30, 2017 5:47 PM
To: Graham Murray
Subject: RE: Old Trail Creekside III, Phase II
Graham,
Sorryfor the delay. In my scenario below, I assumed there would be some percentage of reduction from the basin.
However, if there isn't, yes, all of the remaining 70% can be purchased offsite.
Thanks,
Frank
Frank V. Pohl, PE, CFM
County Engineer
County of Albemarle
(434) 296-5832 Ext. 7914
From: Graham Murray [mailto:graham@collins-engineering.com]
Sent: Thursday, March 30, 2017 9:29 AM
To: Frank Pohl <fpohl@albemarle.org>
Subject: RE: Old Trail Creekside III, Phase II
Good morning Frank,
Thank you again for your detailed e-mail outlining what would be required if the developer eliminated the biofilter
described below. Your second item listed below states 70% of the pollutant load must be treated onsite (since the
lickinghole basin provides a 30% credit) and a portion of this 70% can be satisfied with offsite credit purchases. Would it
be possible to convert the ESC facilty to a detention basin providing zero water quality credit, and purchase offsite
nutrient credits for the entire 70%? This is in contrast to your requirements listed below, but I can't find anything that
explicitly states this isn't possible.
Thank you again for your assistance with this unusual circumstance.
Graham
From: Frank Pohl [mailto:fpohl@albemarle.org]
Sent: Tuesday, March 14, 2017 10:07 AM
To: Graham Murray <graham@collins-engineering.com>
Cc: Emily Cox <ecox@albemarle.org>; Matthew Wentland <mwentland@albemarle.org>
Subject: RE: Old Trail Creekside III, Phase II
Graham,
On September 19, 2014 new guidance was issued on the Lickinghole Basin, which states "on -site facilities will be
required to meet state water quality pollution (phosphorous load) treatment requirements, and Lickinghole Basin may
be used to account for 30% of pollutant load leaving the site." Any changes to the onsite facility will need to meet
current policy standards for the Lickinghole Basin (refer to attached).
Therefore, if the applicant wishes to eliminate the biofilter (treatment of the V flush), the following is required:
- The detention waiver is no longer valid and as such detention must be provided by the facility.
- 70% of the pollutant load must be treated onsite (30% can be provided by the Lickinghole Basin with the
appropriate pro-rata fee). The converted onsite basin may satisfy some of the treatment based on the VRRM
worksheet. The remainder could be satisfied with offsite credit purchase.
- The Lickinghole Basin pro-rata fees will need to be revisited to make sure they were paid and, if so, to confirm if
a credit or additional fee is due.
I notice that the drainage area for the basin/biofilter is different than that of the approved plan. For either option, this
additional area will need to be included and an amendment to the approved plan is required.
I hope this helps,
Frank
Frank V. Pohl, PE, CFM
County Engineer
County of Albemarle
(434) 296-5832 Ext. 7914
From: Graham Murray [mailto:graham@collins-engineering.coml
Sent: Monday, March 13, 2017 12:30 PM
To: Frank Pohl <fpohl@albemarle.org>
Cc: Emily Cox <ecox@albemarle.org>
Subject: Old Trail Creekside III, Phase II
Good afternoon Frank,
To follow up on our meeting from Thursday, attached are the digital e-mail correspondences and attachments I provided you with
last week. I wanted to provide you with these in the event you want to archive them, or I get hit by a bus tomorrow.
Thanks,
Graham
Graham Murray, P.E.
COLLINS ENGINEERING
www.collins-enaineerinci.com
200 Garrett Street, Suite K
Charlottesville, VA 22902
Cell: (434) 566-3011
graham0colllns-ennineerina.com