Orange County NC Website
contaminant transport have not been investigated. Ground- <br />water level map seems to be rather inaccurate. For <br />example, it does not indicate any influence of the wet- <br />lands. <br />7. A number of hypotheses were posed in the report <br />and accepted without proof. Also, a number <br />of incorrect or unsupported statements are in- <br />cluded and accepted. Among them are claims that: <br />• There are no flowpaths under the river through the <br />fractured -rock lower aquifer (Report, p. 22) . This <br />claim is based only on just two measurements used <br />to estimate the vertical hydraulic gradient. A large <br />scale pumping test is needed to demonstrate the <br />claim. <br />• Report, p. 12 "For this reason, bulk hydraulic con- <br />ductivities indicated by the slug tests should be <br />assumed to represent maximum values." Although <br />this statement may be true for relatively homoge- <br />neous formations, it clearly does not cover the <br />fractured -rock aquifer. In my own flowmeter test <br />investigations at Duke Forest Gate 11 Site (geologi- <br />cally similar to the site of the proposed landfill) it is <br />not uncommon (eg., well MW -3) to encounter just <br />one 1/2 -foot fracture per 20 feet of a well screen. If <br />one assumes that the formation can be treated as <br />