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C be collected from the bottom of borings B-4 and B-5(i.e.,at approximately 15 feet bgs). Borings B-4 and h B-5 will then be advanced to.approximately 40 feet bgs,and a groundwater sample will be collected from ' t the deep zone(approximately 40 feet bgs)using Hydropunch techniques.. 1 Boring B-6 will be continuously cored from the surface to 40 feet figs to further characterize site soils for the SCM. One soil sample will be collected from 8-6 at the capillary frin9e(approximately 10 feet bgs)or where elevated PID readings indicate the,presenceofimpact. Depth discrete groundwatersampleswill be collected from the shallow zone (approximately 15 feet bgs), and from the deep zone (approximately ` C 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 t unsaturated zone for chemical analysis. Soil samples will be collected from each boring for Iithologic logging and field screening.,The samples will be collected in a 5-foot by 1.5-inch O.D.core sampler equipped With an acetate liner. Soil samples will be I 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 that describe the encountered soil in general accordance with the American Standards for Testing F Materials(ASTM)2488-06 and the Unified Soil Classification System(USCS). The soil boring logs will Cindicate the depth of the various strata,and record other pertinent information regarding the advancement and sampling of each borehole. s CEach soil sample will be field screened forvolatile organic vapors with a photoionization detector(PID)or imilar instrument.The fieldscreening readings will be recorded on the soft 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 out 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 approximately4 degrees Celsius(°C)with ice. Groundwater samples will be collected using disposable polyethylene tubing. Each sample will'be collected in laboratoryprovided containers preserved as appropriate for the specific analytical testing E method. Sampling containers for volatile organic compound(VOC)analysis will be filled completely with g r sample and preservatives to eliminate headspace and create a positive 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 I C' laboratory foranalysis. Chain-of-custody.records will be maintained and accompany all samples to the analytical laboratory. t Soil and groundwater samples will be analyzed fortotai petroleum hydrocarbons characterized as gasoline C .(TPHg),benzene, ethylbenzene, toluene, totals xylenes (BTEC, five fuel oxygenates (methyl tert butyl ; ether,tertiary butyl alcohol, tertiary-amyl methyl ether,ethyl tert butyl ether,and di-isopropyl ether),-and dead scavengers (ethylene dibroniide and 1;2-dichloroethane) in accordance with EPA Test Method 82608. All cuttings and groundwater removed fromthe borings will be temporarily stored on-site in Department of i LTransportation(D.O.T.)-rated 55-gallon drums pending characterization and proper disposal. �y) Additional lnmligation Wmkpinn ` V Quik Stop No.132,Sbmon,CA p May 1g,2mg I I. r `i I