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' G4olo i al7i"h wslac Page 6 <br /> g � <br /> Site Characterization Report <br /> ' Project No 724 2 <br /> May 9, 2006 <br /> ' and then advanced to the targeted depth When the targeted depth was achieved, the rods <br /> were retracted 24 inches to expose the screen and allow water to enter A groundwater <br /> ' sample was then obtained from inside the rod column by lowering a small diameter stainless <br /> steel bailer into the rods Water samples were then transferred from the bailer to VOA <br /> containers for transport to the laboratory Care was taken to minimize sample agitation from <br /> the initial filling of the bailer to the transfer of the sample to the VOA vial The groundwater <br /> samples were labeled and placed in a cooler at 4° Celsius for transport to the laboratory <br /> following Chain of Custody protocol <br /> ' 2.5 Groundwater Laboratory Analyses <br /> ' The groundwater samples were submitted to California Laboratory Services of Rancho <br /> Cardova, California (State Certified Laboratory#1233) for analysis of <br /> ' • Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 8260B <br /> • Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 8015M <br /> ' • Oxygenated fuel compounds (5) by EPA method 8260B <br /> A summary of the CPT groundwater analytical data is attached in Table 3, Appendix A, and <br /> the lab data reports are attached in Appendix B <br /> As required under AB2886, the soil and groundwater laboratory data were submitted <br /> ' electronically to GeoTracker on May 9, 2006 (confirmation# 8277582466) <br /> ' 3.0 DISCUSSION <br /> 3.1 Geology and Field Observations <br /> The following section discusses the subjective interpretation of the Test America CPT data in <br /> conjunction with the field observations and geology based on the interpretations of GTI <br /> geologists The borehole logs are included in Appendix C and the CPT logs are included in <br /> Appendix D <br />' * CPT-1 The CPT log shows heterogeneous soils extending to the total depth of 74 5 <br /> feet bgs <br />' o The log shows shallow silty or clayey soils to 5 feet bgs These are underlain by <br /> alternating silty, clUgy or undifferentiated stiff fine grained units (hereafter <br /> referred to as fine grained units) extending to 24 feet bgs <br /> o A thin, 0 5 foot thick sand to silty sand unit is present at 24 feet bgs that is <br /> underlain by more fine grained units <br /> o Silty, clayey and fine grained units are present from 24--32 feet bgs <br />