WS-6093_22446_CA_POE_20040730_ sampling results Emogene Moody

July 30, 2004

Mrs. Emogene Moody
1020 Old Hwy 21
State Road, NC 28676
Dear Mrs. Moody:
Subject: POE Sampling Results
Moody’s Grocery/STF-22446/State Road, Wilkes County

I have been informed that you are interested in seeing the laboratory results from the
sampling we have performed when we have serviced your point-of-entry (POE) system. I have
enclosed all of the results since our first service conducted on April 2, 2002.

There are three samples collected each time before the tanks are exchanged. D1 is a
sample of the raw, untreated water; D2 is a sample between the carbon tanks; and D3 is the
treated water after the filter system. D3 is important to look at because this represents the
water that is going into your home. For example, if you look at the results with the collection
date of 4/2/04 (the one at the bottom of the stack), you will see that the D1 sample contained 374 ug/L of benzene, 34.6 ug/L (estimated) of ethylbenzene, 177 ug/L toluene, 278 ug/L of xylenes, and 71.5 ug/L of IPE. However, if you will flip to the next page and look at the D3 results, you will see that all the compounds were <1.0 ug/L. Basically, this means that the results were below quantitation limit (BQL), and the filter system had filtered out all the
contamination and the water was clean.

Now, if you look at the sample results on top of the stack, results for the samples
collected on 6/21/04, you will see that the D1 results (the raw, untreated water) show benzene
at only 1.02 ug/L and xylenes at 6.0 ug/L. All other parameters were BQL. The D3 sample
shows that all compounds were BQL. Again, the filter system is filtering out the contamination.

The other piece of information you need to know is the federal drinking water or state
groundwater standards for these compounds. In other words, what do federal and state government “say” is a safe level of exposure to these compounds. The federal drinking water standard is 5 ug/L for benzene; 700 ug/L for ethylbenzene; 1,000 ug/L for toluene; and 10,000 ug/L for xylenes. There is no federal drinking water standard for IPE so we default to the state groundwater standard of 70 ug/L. I hope you can see that the compound of major concern is
benzene. The first sampling event we did in 4/02, after taking over the service of your filter
system, indicated benzene was at 374 ug/L, well above the federal drinking water standard of
5 ug/L. At the last two sampling events, benzene was either not detected (BQL) or was at 1.02
ug/L, below the federal drinking water standard of 5 ug/L. This is encouraging.

Mrs. Emogene Moody Page 2 July 30, 2004

I hope this helps you to understand how to read these lab results. Please don’t hesitate
to call me at 919-733-1314 if you have any questions.

Sincerely,

Linda Blalock
Environmental Engineer
Federal Trust Fund Enclosures