Laserfiche WebLink
`r <br /> 19 <br /> GOLDEN GRAIN COMPANY <br /> December 21, 1999 <br /> 202/799^-5045.06 <br /> 4.0 RESULTS AND DISCUSSION <br /> 4.1 SOIL-VAPOR SURVEY <br /> Out of 40 drive points attempted during the SVS conducted <br /> September 1, 1969, 27 were successful in <br /> from August 30 to SEP analysis {Figure 4) . Shallow subsurface <br /> vapor for ling in 13 <br /> obtaining ravel) Prevented same yn <br /> obstacles {like concrete or g the (12 and 15 feet) <br /> Vapor was sampled at two depths <br /> reading from each <br /> locations. oints. The highest ure 5, <br /> paint was used to construc <br /> 23 of the 27 successful P shown in Fig <br /> v, t the contour map <br /> higher readings were obtained from vapor treadin5, <br /> In general, depths. The hig <br /> collected at the greater of the two <br /> volume (ppmv) total volatile <br /> 60,000 parts per million feet beneath <br /> was from vapor collected from 1below the <br /> hydrocarbons (TVH) , The only reading <br /> at point 2. Most of the low <br /> the former tank pit, point 22• <br /> e of 10-40 ppmv, which should <br />} method detection limit wasthetrangd a <br /> readings obtained were <br /> in the area. <br /> r be considered background level for <br /> a clay unit <br /> e that there is <br /> Drill logs from this site indendtof Ju e, groundwater levels <br /> at a depth of 22-26 feet. At the <br /> and therefore beneath or within the clay <br /> on the water table while it was above the <br /> were below 25 feet, <br /> unit. SPP floating er part of the clay as <br /> clay layer was Probably trapped in the uPP during the <br /> Hydrocarbon vapors analyzed <br /> sank. Of the clay unit. <br /> the water levels from the top <br /> SVS most likely diffused upward <br /> Of the hydrocarbon <br /> on vapor Plume indicates that the <br /> The extent <br /> robaarbblY the sire of the former tank pit, <br /> source of the vapors is P <br /> -- - - - <br /> S�? <br /> GxauNmwnTFn _- <br /> TECHNOLOGY.INC. <br />