Laserfiche WebLink
CLOSURE PROCEDURES <br /> Soil sampling and laboratory analyses of soil samples collected from beneath the <br /> underground No. 6 fuel pipeline and the courtyard tanks and sump have been the only <br /> phase of inplace closure procedures completed. Soil sampling and drilling operations were <br /> conducted by AEMC and B&F Drilling, Rancho Cordova, California, personnel. Pipeline <br /> boring and sampling operations were conducted on 5 and 6 July 1990. Courtyard tanks and <br /> sump drilling operations were conducted on 16 and 17 July 1990. <br /> Soil Sampling,Pipeline <br /> Eleven (11) inclined boreholes were drilled in the vicinity of the pipeline. See Figure 3 for <br /> the borehole locations. See Figure 4 for a cross-sectional profile of borings PLl through <br /> PL12. PL2 was drilled next to a railroad track spur located at a lower elevation than the <br /> other borings. One (1) vertical borehole was drilled at PL12. Space restrictions precluded <br /> drilling an inclined borehole in the area of the Newark Sierra Paperboard facility. <br /> Soil samples were analyzed for Total Petroleum Hydrocarbons (TPH—diesel range), <br /> Benzene, Touluene, Xylene, and Ethylbenzene (BTXE), and Total Recoverable Petroleum <br /> Hydrocarbons(TRPH). Table 1 (pages 8-10) presents a summary of the analytical results. <br /> Soil Sampling for Courtyard Tanks and Sump <br /> Soil samples were collected adjacent to and directly beneath both ends of the No. 6 fuel <br /> tank(s) and sump using geotechnical drilling and sampling techniques. See Figure 5 for the <br /> borehole locations. Two soil samples were collected from each borehole. Inclined <br /> boreholes were drilled with a trailer-mounted Digger 'R" portable drill rig. Difficult <br /> drilling conditions combined with the low torque output of the Digger 'R" portable drill rig <br /> provided the need for some boring entry angle adjustments. See Figures 6 and 7 for cross <br /> sectional profiles of the sump and tank borings. Prior to commencing initial drilling <br /> t3u.yac(m.x-� Page 5 <br />