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p 1 be collected from the bottom of borings B-4 and B-5 i.e.,at ,tl g ( pproximately 15 feet bgs). Borings B-4 and 13-5 will then be advanced to approximately 40 feet bgs,and a groundwater sample will be collected from the deep zone (approximately 40 feet bgs) using Hydropunch techniques. II Boring B-6 will be continuously cored from the surface to 40 feet bgs to further characterize site soils for the SCM. One soil sample will be collected from B-6 at the capiliary fringe(approximately 10 feet bgs)or where elevated PID readings indicate the presence of impact. Depth discrete groundwater samples will be collected from the shallow zone (approximately 15 feet bgs), and from the deep zone (approximately 40 feet bgs)at boring B-6 using Hyrdropunch;techniques. If unsaturated soils are encountered between the shallow and deep groundwater zones, additional soil samples may be collected from the intervening unsaturated zone for chemical analysis. ,i Soil samples will be collected from each boring for lithologic loggi.!g and field screening. The samples will be collected in a 5-foot by 1.5-inch O.D. core iampler equipped with an acetate liner. Soil samples will be collected at approximate five-foot intervals and at intervals where staining or color or texture changes are noted.The field staff will examine representative portions of the soil samples and prepare soil boring logs j that describe the encountered soil in general accordance with the American Standards for Testing L Materials (ASTM) 2488-06 and the Unified Soil Classification System (USCS). The soil boring logs will indicate the depth of the various strata,and record other pertinent information regarding the advancement j and °i sampling of each borehole. Each soil sample will be field screened for volatile organic vaporstwith a photoionization detector(PID)or similar instrument. The field screening readings will be recorded�on the soil boring log. A portion of each soil sample-will be retained for potential laboratory analysis. The samples will be collected in an acetate liner and the liners will be cut at the desired sample interval and sealed with Teflon®tape and plastic caps at each end. All samples will be stored in an ice chest cooled to approximately 4 degrees Celsius(°C)with ice. I; Groundwater samples will be collected using disposable polyethylene tubing. Each sample will be collected in laboratory-provided containers prleserved as appropriate for the specific analytical testing method. Sampling containers for volatile organic compound (VOC)analysis will be filled completely with I and a .het sample preservatives to eliminate heads ace and create positive P p h este a pond ve meniscus. The vial will be capped with convex Teflon®septa. Each vial will be observed to ensure that no air bubbles are present within the vial. :Samples will be marked for identification, placed on ice, and transported to a California certified laboratory for analysis. Chain-of-custody records will be maintained and accompany all samples to the analytical laboratory. Soil and groundwater samples will be analyzed�fortotal petroleum hydrocarbons characterized as gasoline t (TPHg), benzene, ethylbenzene, toluene, totals xylenes (BTEX),tfive fuel oxygenates (methyl tert butyl ether, tertiary butyl alcohol, tertiary-amyl methyl ether, ethyl tert butyl ether, and di-isopropyl ether), and 1 lead scavengers (ethylene dibromide and 1,2-dichloroethane) in accordance with EPA Test Method 82608. "t i All cuttings and groundwater removed from theborings will be temporarily stored on-site in Department of Transportation (D.O.T.)-rated 55-gallon drums.pending characterization and proper disposal. i y Additional Imatigation Woftim Quik Stop No.132,StDckt n,CA j .... ;7 May 18,2009 i }