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C7eologkal rechnics leu Page 5 <br /> Additional Site Characterization Work Plan <br /> Project No.724.2 <br /> March 15,2005 <br /> 2.1.2 Soil Sample Laboratory Analyses <br /> Petroleum Hydrocarbon Analysis <br /> A maximum of 3 soil samples per borehole will be submitted to a State certified laboratory <br /> for the following analyses: <br /> • Benzene,toluene, ethylbenzene and xylene (BTEX)by EPA method 602. <br /> • Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 5030/8015(m). <br /> • Gasoline oxygenates (MTBE, DIPE,ETBE, TAME&TBA) by EPA method 8260. <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 /> Detection Limits: I BTEX I Oxygenates I TPH-G <br /> Soil (jig/Kg) 13.0 15 -20 11,000 <br /> 2.1.3 Water Sampling Procedure <br /> Water sample depths will be targeted to complete the site conceptual model illustrating the <br /> lateral and vertical extent of the groundwater plume at the site. Gregg will utilize a <br /> hydropunch type sampler to obtain samples at depths to be determined in the field. The <br /> sampler is attached to the end of the drill rods and then advanced to the targeted depth. <br /> When the targeted depth is achieved, the rods are retracted 12— 18 inches to allow a screened <br /> portion of the rods to be exposed and water to enter. A water sample will then be obtained <br /> from inside the rod column by lowering a small diameter bailer into the rods. Water samples <br /> will then be transferred from the bailer to VOA container for transport to the laboratory. <br /> Care will be taken to minimize sample agitation from the initial filling of the bailer to the <br /> transfer of the sample to the VOA vial. A description and schematic of the process is <br /> included in Appendix C. <br /> 2.1.4 Water Sample Laboratory Analyses <br /> Up to 4 groundwater samples from each borehole will be submitted to a State Certified <br /> Laboratory for the following analyses: <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 /> • Gasoline oxygenates (MTBE,DIPE,ETBE, TAME&TBA) by EPA method 8260 <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 /> Detection Limits: BTEX Oxy,s TPH-G <br /> Water(µ /L) 0.3-0.6 15 - 50 150 <br />