Laserfiche WebLink
J t <br /> 1 <br /> II METHODS <br /> a ' <br /> A Radar Instrumentation <br /> We used a SIH 3 ground penetrating radar system to collet . radar data at the <br /> site. The SIR 3 bas a radar control unit, a graphic profiler, and a 500-MHz <br /> antenna The ar t�-nna transmits a radio frequency electromagr_etic pulse mto <br /> the ground. 'I'll's _.)ulse travels through the ground at approximately 2% <br /> nanoseconds per foot. Buried features, such as tanks, reflect the pulse back to <br /> the ground surface f"he radar detects the returning reflection: and plots them <br /> with the graphic profiler <br /> 1 <br /> B Radar Field Procedures <br />' Radar data were collected in two areas at the site (Drawint 2). The first area <br />' was on the north and east side of the sandwich shop This wa,, the approximate <br /> location of the origi ial "oil and gas" structure dating from the 1920's to 1957 <br />` Radar data were t c Netted along two sets of overlapping travel sp lines in this <br /> area One set was oriented south to north. The other set was oriented from <br /> t ! west to east. We spaced the traverse lines two feet apart because buried tanks <br /> from the 1920's tend to be small. <br /> 1 <br /> ' M <br /> The second ares was in the parking lot of the sandwich shcp. Data were <br /> collected in this aroa to look for the trench that once held the three main fuel <br /> tanks associated with the ]957 to 1980 building Radar data were collected <br /> 3 <br />