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Preliminary Investigation and Evaluation Report-- California Cedar Products <br /> volatile hydrocarbons Benzene, Toluene, Ethylbenzene and Xylenes (BTEX), <br /> ' and for the 5 fuel oxygenates (TBA, MTBE, DIPE, ETBE and TAME) <br /> ' Prepared this technical report of findings <br /> ' 2.0 Methods of Investigation <br /> ' The following sections describe techniques used during the exploratory soil <br /> investigation and groundwater grab sampling on 12 September 2002 The probe <br /> locations are shown on Figure 3 — Subsurface Probe Map <br /> 21 Exploratory Soil Sampling <br /> A C-57 licensed drilling subcontractor using a mobile, truck-mounted GeoProbe <br /> sampling rig performed soil probing Members of Underground Service Alert (USA) <br /> under clearance ticket no 373556 first cleared drilling locations To access the <br />' subsurface, Cal West Concrete Coring performed concrete coring on 5 September <br /> 2002 <br /> On 12 September 2002, the mobile GeoProbe sampling rig was positioned over the <br />' marked location of B1 shown on Figure 3- Subsurface Probe Map Soil samples <br /> were sub-sampled from the drive tube at depths of 13-15 feet below ground surface <br /> (bgs), 18-20 feet bgs, and 23-25 feet bgs (five-foot depth intervals beginning at the <br /> bottom of the tank pit) Probing was continued to a depth of 28-30 feet bgs to <br /> determine vertical extent of diesel in clay encountered at 24 5 feet bgs Unconfined <br /> groundwater was encountered at an approximate depth of 19 feet bgs based on <br />' observations of wet soils in B2, 63 and B4 <br /> 1The soils were logged by a Registered Geologist according to the Unified Soil <br />'• Classification System ASTM-2488 visual A MiniRAE hotoionization detector was <br /> Y ( ) p <br /> RAB Consulting <br /> 3 <br />