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AQLL4TEPPA <br />Environmental Consultants <br />August 3, 1992 <br />Mr. Reginald Gillespie <br />Faison, Fletcher, Barber & Gillespie <br />University Tower Suite 1400 <br />3101 Petty Road <br />Durham, North Carolina 27717 -1729 <br />LA 0 S 1992 <br />Referefice: Use of Geophysical Methods <br />Reconnaissance for Sanitary Landfill Evaluations <br />Orange County Sites, North Carolina <br />Aquaterra Job No. 598 <br />Dear Mr. Gillespie: <br />As you requested during a July 28, 1992, conversation with Mr. David Duncklee, <br />Aquaterra has prepared the following information concerning the merit of <br />geophysical evaluations in siting suitable tracts of land for sanitary landfills. The <br />possibility of using geophysical techniques such as a seismic or magnetic method was <br />originally recommended in our March 2, 1992, correspondence (L2434 -92). <br />Prospective Geophysical Methods <br />Magnetic Prospecting Method <br />The presence of a diabase dike is a major limitation for a potential site. Magnetic <br />prospecting techniques such as a magnetometer can be used to determine whether a <br />diabase dike underlies a site- These instruments detect variations in the earth's <br />magnetic field, which indicates the potential presence of near surface objects. <br />The presence of ferrous minerals in the geologic features account for the features' <br />magnetic properties. The order of magnetic properties are from the basic igneous <br />rocks (ie, gabbros, diabase), acid igneous rocks (granites), metamorphic rocks, shale <br />sandstone and sediment, and dolomite. , <br />Corporate Office <br />Charlotte office <br />P. o. Box 50328 <br />Greensboro Office <br />Raleigh, NC 27650 <br />P. O. Box 668107 <br />(919) 859 -9987 <br />Charlotte. NC 28266 -8107 <br />P. O• Box 16241 <br />FAX (919)859.9930 <br />('04)525.8680 <br />Greensboro, NC 27416 -0241 <br />FAX (704)527 -2792 <br />(919) 273 -5003 <br />FAX (919) 271 -8138 <br />