Re: Questions on I540 project 

Ryan F. Brown 

to: 

Jesse Pritts 

05/13/2011 09:32 AM 

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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 need anymore information. Feel 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 submitted (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 document 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 turbidity 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 sampler 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. There were other days where influent 

samples were collected for one of the basins, but no effluent samples 

were collected. Your document indicates that at the basin 4 OUT 

location, it was discovered in early January that the sample collection

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tubing was torn. Can you confirm that on days when influent samples were

collected, but no effluent samples were collected, it was due to either 

sampler malfunctions or other unknown reasons. 

4. Similar to question 2, for the events on 2/4-2/5-2/28, there were 21 

sample bottles collected at the basin 4 EXIT location. Could you provide 

the date/time for each of the individual 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 these 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 and the level of disturbance and types of 

construction activities that occurred in the areas draining to both the 

basin 3 and basin 4 locations during the time period when the samples 

were collected. 

Thank you- 

(See attached file: Wake County NCDOT Site Summary for Turbidity 

TSSdocx-1.docx)(See attached file: URS Analysis Corrections.pdf) 

-- 

Please Consider Donating and Fighting Against MS

Ryan F. Brown 

Biological and Agricultural Engineering 

NC State University 

rfbrown@ncsu.edu

(803)-240-0059

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