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' 30 June 1999 <br /> AGE-NC Project No. 98-0468 <br /> 'Page 5 of 12 <br /> 4.1. SOIL SAMPLE COLLECTION AND ANALYSIS. <br /> A total of five soil borings(B-1 through B-5) were advanced utilizing hollow stem auger techniques. <br /> Soil borings B-4 and B-5 were'subsequently completed as monitoring wells MW-4 and MW-S,' <br /> ' respectively. Soil boring locations are shown.on Figure 2.As shown on Figure 2, soil borings-SB-4' <br /> (MW-4)and S13-5 (MW-5)were completed at locations down gradient(north)of previous soil probe <br /> boring SB�7 andthe former UST locations, and soil boring B-1 was advanced at a location up . <br /> ' . gradient(south) of the former UST locations. Soil boring B-2 was advanced east of the former UST <br /> area to evaluate previously reported anomalous ground water analytical results in the vicinity of <br /> monitoring well MW-1'and soil probe boring SB-1: Soil borings B-3 was completed west of <br /> '• previous soil probe boring SB-6 and the former UST'area. <br /> ' Soil-borings B-1 through'B-3.were advanced to a total depth of 15 feetbsg. Sail boririgs MW-4 and <br /> MW-5 were advanced to depths of 21 feet bsg and 17 feet bsg, respectively. Soil borings were <br /> continuously sampled and/or sampled at five-foot intervals using a driven split-spoon sampler from ` <br /> approximately four feet,bsg to the total ;depth of the borings: Soils were visually described and <br /> togged in accordance with the.Unified Soil Classification System �SCS . Boring.los are presented <br /> in Appendix B. Soil sample collection procedures are presented in Appendix A. <br /> Soil samples were selected for laboratory analysis based on field observations. Selected soil.samples <br /> were.submitted to McCampbell Analytical Inc. in Pacheco; California. McCampbell Analytical Inc. <br /> is a State-of California Department of Health Services'(DHS)-certified laboratory. Soil samples were <br /> analyzed for::. <br /> ' TPH-d by EPA Method 8015 Modified/5030; <br /> • TPH-g.by EPA Method 8015 Modified/5030; <br /> • BTEX by EPA Method 8020; and <br /> Fuel oxygenates including DIPE, ETBE, MTBE, TAME, and TBA by EPA Method 8260. „ <br /> 'The results of the soil sample laboratory analysis are presented in Section 5.3. :' <br /> 4.2. GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> 4 <br /> During the soil boring activities, ground water samples were collected from soil.borings B-1 through <br /> B=3 for laboratory analysis. In addition, ground water samples were'collected from monitoring wells <br /> MW-1 through MW-5. Ground water samples were collected from the top of the first encountered' <br /> ' water-bearing unit. One grab'ground water sample was collected from the borehole of soil boring <br /> B-1. Depth discrete ground water samples were collected from soil borings B-2 and B-3 using a <br /> Advanced GeoEM ironmentet,Inc. <br />