Re: Questions on I540 project Ryan F. Brown
to: Jesse Pritts 05/13/2011 09:32 AM Show Details

History: This message has been replied to.

Hey Jesse,

I copied your email into a word file and answered the questions below where they were asked. The attached file (Questions Pertaining to Wake County NCDOT I-540 Project.docx) contains the word file.

Let me know if you have any further questions or ne ed anymore information. F eel free to email or call (8032400059).

Thanks

On Thu, May 12, 2011 at 1:48 PM, < Pritts.Jesse@epamail.epa.gov > wrote:RyanI have some additional questions on the I540 project - see below:

1. In the documentation Rich submitte d (URS Analysis Corrections.PDF, Attachment 2) in December 2010, there is an event listed on 11/17 of 0.33 inches that was sampled. However, in the documentation you submitted in March 2011 (Wake County NCDOT Site Summary for Turbidity TSSdocx-1.docx) this event is listed as occurring on 11/16/2010. Can you confirm that the 11/17 event in Rich's document is the same as the 11/16 event in your document and can you provide the correct date that the event occurred? I've included both files as an attachment for your reference.

2. For the 11/4-6 event, Rich's docum ent indicates that there were 11 bottles collected at the Basin 3 OUT location. My understanding is that each bottle contains four individual sample aliquots. Could you provide the time that each sample aliquot in each of the 11 bottles was collected? Also, did you record turbidity of each of the 11 bottles? If so, could you provide the individual tu rbidity values for each bottle?

3. In Rich's document, no sample was collected during the 11/4-6 event at Basin 4 OUT due to a sample r malfunction. In your document, you stated that for the 12-16/17 event no sample was collected from the basin 3 OUT due to unknown reasons. Ther e were other days where influent samples were collected for one of the basins, but no effluent samples were collected. Your document indi cates that at the basin 4 OUT location, it was discovered in earl y Januar y that the sample collection Page 1 of 2

5/23/2011 file://C:\Documents and Settin g s\ jp ritts\Local Settin g s\Tem p \notesFCBCEE\~web0596.htmtubing was torn. Can you confirm that on days when influent samples were collected, but no effluent samples we re collected, it was due to either sampler malfunctions or other unknown reasons.

4. Similar to question 2, for the ev ents on 2/4-2/5-2/28, there were 21 sample bottles collected at the ba sin 4 EXIT location. Could you provide the date/time for each of the indivi dual sample aliquots contained in each bottle, and the turbidity of each bottle if available.

5. Can you provide more information on when the grab samples on 1/4 were collected at the basin 3 and 4 EXIT locations and what flows these grab samples represent. It appears that th ese samples are not correlated with the 12/16-17 storm event.

6. Does the water exiting basin 3 flow into basin 4 (or vice versa).

7. Do you have any additional information on the timeline of this construction project a nd the level of disturbance and types of construction activities that occurre d in the areas draining to both the basin 3 and basin 4 locations duri ng the time period when the samples were collected.

Thank you-

(See attached file: Wake County NCDOT Site Summary for Turbidity TSSdocx-1.docx)(See att ached file: URS Analysis Corrections.pdf)

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P lease Consider Donating and Fighting Against MS

R yan F. Brown B iological and Agricultural Engineering N C State University

r fbrown@ncsu.edu ( 803)

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