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borings were continuously cored, and soil samples were collected from <br /> . the borings for lithologic description, potential chemical analysis, and <br /> head-space analysis Soil samples were screened for the presence of <br /> organic vapors using a photo ionization detector (PID) PID readings <br /> are recorded on the boring logs <br /> Number of Borings- Two borings (B-1 and B-2 ) Boring locations are shown on Plate 2 <br /> Baring Depths 35 and 28 feet below grade (fbg } <br /> Ground Water Depths: Ground water was not encountered during the investigation A small <br /> zone of free water present in the formation was first observed at <br /> approximately 14 7 fbg in Boring B-1 during the investigation This <br /> zone did not appear to extend past 17 fbg in Boring B-1, and was not <br /> encountered in Boring B-2 <br /> Sediment Lithology Lithology encountered while drilling the borings consisted of clay <br /> (CL), to depths of approximately 12 to 14 fbg, underlain by clayey <br /> sand (SC) and silt (ML) to depths of approximately 17 to 18 fbg, <br /> underlain by sand (SP) to depths of approximately 21 to 23 fbg, <br /> underlain by silty sand (SM), clay (CL) and silt (ML) to the total <br /> explored depth <br /> Chemical Analyses Four soil samples from Boring B-1 and three soil samples from <br /> Boring B-2 were selected for chemical analysis A water sample <br /> collected from the free water zone encountered in Boring B-I was also <br /> analyzed Samples were analyzed for Total Purgeable Petroleum <br /> Hydrocarbons (TPPH) by EPA Method 8015 (modified), benzene, <br /> toluene, ethylbenzene, and xylenes, (BTEX) by EPA Method 8020, <br /> and tertiary-butyl alcohol, methyl-tertiary-butyl ether (MTBE), di- <br /> isopropyl ether, ethyl-tertiary-butyl ether, and tertiary-amyl-methyl <br /> ether by EPA Method 8260 <br /> Soil Disposal. Approximately 0 11 tons of soil were generated during field activities <br /> This soil was profiled for disposal at Forward, Inc 's Manteca, <br /> California landfill and transported by Manley and Sons Trucking, Inc <br /> of Sacramento, California on January 16, 1998 <br /> Backfill Method Borings B-1 and B-2 were backfilled with cement grout to the surface <br /> I <br /> 240-0832 3 <br />