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' h*1 K L E I N F E L D E R <br /> 4.3 LABORATORY ANALYSIS <br /> Each of the soil and water samples selected for quantitative analysis were submitted under chain- <br /> of-custody control to Sequoia Analytical Laboratories (Sequoia) of Sacramento, California. <br /> Sequoia is certified by the California Department of Toxic Substances to perform the requested <br /> analyses. A total of thirteen soil samples and six groundwater samples were submitted for <br /> ' analyses. Two soil samples (collected at approximate depths of 5 and 10-feet) and one <br /> groundwater sample were submitted from borings Bl/HP-1 through B6/HP-6. One soil sample <br /> was also submitted from B7 from a depth of approximately 15 feet bgs. The thirteen soil <br /> ' samples and six groundwater samples were analyzed for: <br /> • Volatile Organics by EPA Method 8260 <br /> ' • Semi-Volatiles Organics by EPA Method 8270 <br /> • Fuel Fingerprint by EPA Method 8015M <br /> 0 CAM 17 Metals by EPA Methods <br /> ' The samples were analyzed on a standard analytical turnaround requiring approximately 10 to 15 <br /> working days for analysis. <br /> ' 4.4 SUBSURFACE SOILS <br /> Generally the subsurface conditions encountered were as follows: <br /> ' Approximate Generalized <br /> Interval Soil Description <br /> 1 0- 2 feet Aggregate Base/Sand Gravel (ML, SM), dark brown, dense, moist <br /> ' to very moist, fine to coarse grained gravel. <br /> 2 - 13 feet Silty Clay (CL), brown, moist to very moist, soft to stiff, some fine <br /> sand. <br /> 13 -21 feet Silty and Clayey Sands and Clayey Silts (SM, SC, and ML), brown, <br /> wet. (Sandy Gravel (GM) noted in boring B4 at a depth of <br /> approximately 18 feet). <br /> ' For additional details regarding the subsurface conditions encountered, please refer to the logs of <br /> borings in Appendix A. <br /> 1 <br /> ' 20-4054-OI.E01/2018R299 Page 8 of 15 <br /> © 1998,Kleinfelder,Inc. May 8, 1998 <br />