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"Co togccal TecknusInc Page 6 Additional Site Characterization Report Project No 662 2 February 20,2004 ' The Gregg staff removed the brass sleeves from the sampler and presented them to the GTI field geologist All soil samples were sealed with Teflon sheets, capped, labeled and placed to a cooler at 4° Celsius for transport to the laboratory following Chain of Custody protocol 2.4 Soil Laboratory Analyses ' U to 4 soil samples per borehole were submitted to e Up p p Sequoia Analytical of Sacramento (State Certified Laboratory#1624) for analysis for • Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 8260B • Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 8260B • Gasoline oxygenates (MTBE, DIPE, ETBE, TAME & TBA) by EPA method 8260B • EDB (two samples only) A summary of the soil laboratorydata is attached in Table l Appendix A and the pP laboratory data reports are attached in Appendix B ' 2.5 Groundwater Sampling Procedure P g Water sample depths were targeted to complete a site conceptual model illustrating the lateral and vertical extent of the groundwater plume at the site Gregg utilized a ' hydropunch type sampler to obtain samples at depths designated by the field geologist The sampler was attached to the end of the drill rods and then advanced to the targeted depth When the targeted depth was achieved, the rods were retracted 12 — 18 inches to allow a ' screened portion of the rods to be exposed and water to enter A water sample was then obtained from inside the rod column by lowering a small diameter stainless steel bailer into the rods Water samples were then transferred from the bailer to VOA containers for ' transport to the laboratory Care was taken to minimize sample agitation from the initial filling of the bailer to the transfer of the sample to the VOA vial All of the groundwater samples were labeled and placed in a cooler at 4° Celsius for transport to the laboratory following Chain of Custody protocol 26 Groundwater Laboratory Analyses U to 5 water samples per borehole were submitted to Sequoia Analytical of Sacrament Up p p q Y a ' (State Certified Laboratory #1624) for analysis for • Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 8260B + Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 8260B • Gasoline oxygenates (MTBE, DIPE, ETBE, TAME & TBA) by EPA method 8260B • EDB by EPA method 8260B i