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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 B-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. Boring B-6 will be continuously cored from the surface tort40 feet bgs to fuher characterize site soils for E the SCM. One soil sample will be collected from B-6 at the capillary fringe(approximately 10 feet bgs)or l 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_(appro(imately 40 feet bgs) at boring B-6 using Hyrdropunch techniq s If unsaturated soils are encountered between the shallow and deep groundwater zones, additional soil sam' 1pes maybe collected from the intervening j unsaturated zone for chemical analysis. Soil samples will be collected from each boring for lithologic logging and field screening. The samples will be collected in a 5-foot by 1.5-inch O.D. core samplerequipped 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 that describe the encountered soil in general accordance with the American Standards for Testing 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 and sampling of each borehole. Each soil sample will be field screened for volatile organic vapors with_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. ___- r Groundwater samples will be collected using disposable polyethylene tubing. Each sample will be collected in laboratory-provided containers preserved as appropriate for the specific analytical testing method. Sampling containers for volatile organic compound (VOC)analysis will be filled completely with F sample and preservatives to eliminate headspace and create a positive meniscus. The vial will be capped with convex Teflon es pta. 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. e • Soil and groundwater samples will be analyzed fortotal petroleum hydrocarbons characterized as gasoline ° (TPHg), benzene, ethylbenzene, toluene, totals xylenes (BTEX), five fuel oxygenates (methyl tert butyl ether, tertiary butyl alcohol, tertiary-amyl metFij l ether, ethyl tert butyl ether, and di-isopropyl ether), and lead scavengers (ethylene dibromide and 1,2-dichlo_ roethane) in accordance with EPA Test Method 8260B. All cuttings and groundwater removed from the borings will be temporarily stored on-site in Department of Transportation (D.O.T.)-rated 55-gallon drums pending characterization and proper disposal. Additional investigation St Workplan Quik Stop No.132,Stockton,CA ... May 18,2009 It 1