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BRIA and possible chemical analysis from well S-4 Soil samples will be screened in the field at five- foot intervals for organic vapors with a PID PID readings will be recorded on the boring log for each boring and well Soil borings SB-4 through S13-6 will be logged with the CPT logging method and equipment Soil samples will be collected for possible chemical analysts at l0-foot intervals in these boring to the depth of 50 fbg Below 50 fbg, soil samples will be collected at five-foot intervals for possible chemical analysts Soil samples will be retained to sample tubes which will be covered on both ends with Teflon sheets and plastic end caps Soil samples will be labeled, entered onto a chain-of-custody record and placed into a cooler with ice for transport to a State of California certified laboratory for analysts Monitoring Well Installation Well S-4 will be constructed of 4-inch diameter threaded Schedule 40 PVC well casing Approximately 15 feet of screen will be placed to the wells, with the screen placed at least 10 feet below and 5 feet above the top of the groundwater table The sandpack will be placed 1 to 2 feet above the top of the well screen followed by a l-foot thick bentoritte seal A cement-grout seal will be placed above the bentonite seal to grade The well will be secured with a locking cap under a traffic-rated well box Groundwater Sampling Groundwater will be collected from boring S13-4 at 60 fbg, 70 fbg, and 80 fbg at a minimum If SB-4 is drilled deeper additional groundwater samples may be collected Groundwater samples will be contained in approved sample containers, labeled, entered onto a chain-of-custody record and placed into a cooler with ice for transport to a State of California certified laboratory for analysts A Shell-approved sampling contractor will develop and sample well S-4 The samples will be submitted to a state-certified laboratory for analysts i i Cliemical Analyses Groundwater samples and selected soil samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHg) by EPA Method 8015 (modified) and benzene, toluene, ethylbenzene, xylenes (BTEX) and MTBE by EPA Method 8020 If MTBE is detected to soil or groundwater samples by EPA Method 8020, an EPA Method 8260 confirmation analysis will be performed on the soil and/or groundwater samples from each boring which contained the highest level of MTBE by the EPA Method 8020 The groundwater samples collected from Well S-4 will be analyzed for the seven fuel oxygenates during it first sampling event This analysis for fuel oxygenates is proposed as a one-time 241-0797 6