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clakgkoI Technics/tic. Page 5 <br /> Additional Site Characterization Work Plan <br /> Project No.724.2 <br /> + March 8 2005 <br /> { t� 3.4 Water Sampling <br /> �Y Water sample depths will be targeted to complete a site conceptual.model illustrating the <br /> L lateral and vertical extent of the groundwater plume at the site. A hydropunch type <br /> sampler will be used on the end of the .drill rods to obtain samples at depths to be <br /> determined in the field. The sampler is attached to the end of the drill rods and then <br /> advanced to the targeted depth. When the targeted depth is achieved, the rods are <br /> retracted 12 — 18 inches to allow a screened portion of the rods to be exposed and water <br /> to enter. A water sample will then be obtained from inside the rod column by lowering a <br /> small diameter bailer into the rods. Water samples will then be transferred from the <br /> bailer to the VOA container for transport to the laboratory. Care will be taken to <br /> minimize sample agitation from the initial filling of the bailer to the transfer of the <br /> sample to the VOA vial. A description and schematic of the process is included in <br /> Appendix B. } <br /> 3.5 Water Sample Analyses <br /> r <br /> A maximum of three groundwater samples from each borehole will be submitted to a state <br /> certified laboratory for the analysis of: <br /> � I <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX)by EPA method 602/5030 } <br /> • Gasoline range petroleum hydrocarbons (TPH-G)'by EPA method 5030/8015(m) <br /> • Oxygenated fuel compounds (5) by EPA method 8260B <br /> � L <br /> The detection limits for these compounds are listed below. A Chain of Custody will be, <br /> completed for all samples collected and tracked to ensure sample integrity. <br /> Re <br /> orting Limits: BTEX TPH-G 4 Oxygenates* TBA (oxygenate) <br /> Water ( /L) 0.5-0.1 50 0.5 5.0 <br /> MTBE, DIPE, ETBE, & TAME <br /> 4.0 SCHEDULE & REPORTING <br /> Geological Technics Inc. anticipates beginning fieldwork no later than 30 days after work <br /> plan approval; cost pre-approval from the USTCFP and issuance of the <br /> j encroachment/monitoring well permits. - <br /> r <br /> The information gathered during this phase of work (CPT installation) will be presented in k <br /> the updated Site Conceptual Model (SCM). <br /> t ` <br />