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Chevron Pipeline Easement Environmental Assessment Report <br /> November 21,2001 <br /> Page 6 <br /> Table 2. Groundwater Sample Analytical Methods and Practical Quantitation Limits <br /> Analyte Method PQL <br /> TPH-G EPA 8260 and GC/MS Combination 50 µg/L <br /> TEPH-D GC/MS Combination 2000 µg/L <br /> TEPH-D/SG GC/MS Combination 2000 µg/L <br /> Benzene EPA 8260 0.5 µg/l__, <br /> Toluene EPA 8260 0.5 µg/L <br /> Ethylbenzene EPA 8260 0.5 µg/L <br /> Xylenes EPA 8260 0.5 µg/L <br /> PNAs <br /> Acenaphthene EPA 8270 (SIM) 2.0 µg/L <br /> Acenaphthylene EPA 8270 (SIM) 2.0 µg/L <br /> Anthracene EPA 8270 (SIM) 2.0µg/L <br /> Benz(a) anthracene EPA 8270 (SIM) 2.0 µg/L <br /> Benzo (b)fluoranthene EPA 8270 (SIM) 2.0 µg/L <br /> Benzo (k) fluoranthene EPA 8270(SIM) 2.0 µg/L <br /> Benzo (a) pyrene EPA 8270 (SIM) 2.0 µg/L <br /> Benzo (ghi) perylene EPA 8270(SIM) 2.0 µg/L <br /> Chrysene EPA 8270 (SIM) 2.0 µg/L <br /> Dibenzo (a,h) anthracene EPA 8270 (SIM) 2.0 µg/L <br /> Fluoranthene EPA 8270 (SIM) 2.0 µg/L <br /> Fluorene EPA 8270 (SIM) 2.0 µg/L <br /> Indeno (1,2,3-cd) pyrene EPA 8270(SIM) 2.0 µg/L <br /> Naphthalene EPA 8270 (SIM) 2.0 µg/L <br /> Phenanthrene EPA 8270(SIM) 2.0 µg/L <br /> Pyrene EPA 8270 (SIM) 2.0 µg/L <br /> µg/L=micrograms per liter <br /> PQL=standard Practical Quantitation Limit <br /> 4.0 INVESTIGATION RESULTS <br /> 4.1 FIELD OBSERVATIONS <br /> 4.1.1 Trench Excavations <br /> Condor excavated 13 trenches at locations of future utility pipe crossings of Byron Road. The first trench <br /> was approximately 120 feet in length. The remaining 12 trenches were approximately 20 feet in length. <br /> Trench depths varied from seven to ten feet. Trench locations are shown on Figures 4, 8, and 9, located <br /> in Appendix A. <br /> While excavating trench T1, the backhoe uncovered a Pacific Bell telephone line. The locating service <br /> for Pacific Bell had marked an 11-foot offset from the road for the telephone line 30 feet north of the <br /> trench site and a seven-foot offset 90 feet south of the trench site. The telephone line was uncovered six <br /> feet from the road. Condor contacted the Pacific Bell locating service and notified them that the backhoe <br /> had encountered the telephone line. Pacific Bell personnel responded to repair the surface insulation of <br /> the exposed telephone line. The trench excavation was relocated to within four feet of the road and the <br /> excavation was continued. The excavated soil was wet below seven feet. The trench was excavated down <br /> to 10 feet, at which point groundwater seeped into the excavation. Due to groundwater infiltration, the <br /> trench depth was reduced to seven feet. The depth of the remaining trenches was limited to seven fe <br /> 4M <br /> CONDOR <br />