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Mr. Marty Hartzell <br /> Page 2 <br /> contaminants disperse with transport, contaminants decay at first order rates estimated' by <br /> Howard. The calculated interstitial groundwater velocity is approximately 0.12 feet-per day. <br /> the calculated maximum chemical concentrations at the receptor point are: <br /> 1,1-DCA: 0.83 parts per billion (ppb) <br /> cis-1,2-DCE: 1.5 ppb <br /> MTBE: 2.8 ppb <br /> None of these compounds would be present at concentrations above MCLs. In fact, sampling <br /> of monitoring well MW1, which is located almost directly between the former tankpit and the <br /> domestic well has not detected these compounds. Input and output data from the modeling <br /> program are attached. <br /> We hope this information is helpful. If you have any additional questions or comments please <br /> contact us at your convenience. <br /> Respectfully, <br /> Ground Zero Analysis Inc. CD GFa� <br /> Gregory P. Stahl, RG 5023 GREGGRY <br /> CA Certified Hydrogeologist No. 264 5TH <br /> No. 5023 � <br /> Attachments <br /> cc: Mr. Ed Niemann <br /> OF CAL1�dQ��' <br /> /4- S? -OCE <br /> j <br />. I <br />