Laserfiche WebLink
Limited Environmental Investigation July 16, 1990 <br /> ARCO Service Station No. 6100, Tracy, California _ AGS 30041-1 <br /> Soil samples were collected during drilling at approximately 5-foot intervals and were <br /> classified according to the Unified Soil Classification System (Plate P-3). Descriptions of <br /> materials encountered are presented in the Logs of Boring(Plates P-4 through P-14). 'Ther <br /> materials consisted predominately of silt and clay. <br /> The borings were terminated when(1)photoionization detector(PID)readings of less than <br /> 50 parts per million by volume (ppmv)were obtained.in two consecutive samples,and (2) <br /> other additional subjective evidence of gasoline hydrocarbons such as soil discoloration or <br /> obvious odor was not noted. Boring B-1 was terminated 56 fret below surface grade,boring . <br /> :.� B-2 was terminated 41 feet below grade, and boring B-3 was terminated 26 feet below <br /> grade. The total depth of borings B-4 and B-5 was 31 feet below grade. <br /> i <br /> The Logs of Boring for B-1 and B-3 show saturated sediment was present in a 6-inch sample <br /> E from approximately 19-1/2 to 20 feet below grade and between 14-1/2 and 15 feet below <br /> grade in boring B-4. Ground water was not detected at these depths using a water level <br /> indicator. The bottom 6-inch samples collected from each.boring in the 18-inch split spoon <br /> sampler were logged as damp or dry. All soil samples collected below the saturated sample <br /> were logged as damp or dry. Saturated sediment was not sampled in borings B-2 and B-5. <br /> 6 <br />