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y 670069kOI Teclucics lnc. 4�C Page 3 <br /> Additional Site Characterization Work Plan <br /> Project No.770.2 <br /> March 3,2005 <br /> Information on the use of CPT and associated sampling is included in Appendix B. (Note: the <br /> contractor data included in Appendix B is for informational purposes only and three bids will <br /> be obtained for the work as the USTCFP requires.) <br /> V <br /> Prior to commencing work, soil boring/monitoring well permits will be secured and the San <br /> Joaquin County EHD will be notified at least 48 hours in advance. The subsurface will be <br /> cleared of underground utilities by notifying Underground Service Alert 4 <br /> The borings will be advanced by a CPT rig with an appropriate drilling license. The <br /> boreholes will be advanced to a maximum depth of 90 feet below the ground surface (bgs). <br /> The expected depth to groundwater in this area is 67 feet below grade, based on information <br /> from the December 2004 groundwater monitoring event. <br /> 3.2 Soil Sampling Procedure <br /> u <br /> Soil sampling with direct push rods requires the use of retractable sleeve tools. When the <br /> sampler reaches the target depth, the rods are retracted to expose the cavity in the tip of the <br /> sampler. The sampler is then locked in this open position and the rods driven downward to <br /> allow soil to enter the device. The rods are then removed for sample retrieval. More <br /> information on the process is included in Appendix B. <br /> 3.3 Soil Sample Analyses <br /> The following discussion summarizes the sample testing proposed for this phase of work. <br /> M;nmL/ y <br /> 1. At a minimum, the capillary fringe soil sample will be tested from each of the boreholes 1 <br /> (8 samples). <br /> 2. If field evidence (odor or discolored soil smear on rods) suggests that significant <br /> contamination is present then additional soil samples will be analyzed, up to a maximum <br /> ` of four samples per borehole. !— <br /> 3. Soil samples will be tested for the following compounds: <br /> • Purgeable aromatic hydrocarbons (BTEX)by EPA method 8020 <br /> • Total Petroleum Hydrocarbons as gasoline by EPA method 8015M. <br /> • Total Extractable Petroleum Hydrocarbons as diesel by EPA method 8015M <br /> 1�1 <br /> The samples will be submitted to a state certified laboratory for analysis. The detection <br /> limits for these compounds are listed below. A Chain of Custody will be completed for all <br /> samples collected and tracked to ensure sample integrity. <br /> Detection Limits: TEPH-D BTEX TPR-G <br /> Soil ( /kg) 1,000 3 1,000 <br /> v <br /> V <br />