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S E C 0 R <br /> ATTACHMENT 4 <br /> FIELD AND LABORATORY PROCEDURES <br /> Exploratory Drilling <br /> The soil borings were drilled using 4 5-inch diameter drive casing advanced by sonic drilling <br /> equipment Borings were logged by an SECOR field staff using the Unified Soil Classification <br /> System and standard geologic techniques Soil samples for logging and laboratory analysis <br /> were collected continuously from 80 to 120 by advancing coring rods All soil samples for <br /> chemical analysis were retained in brass liners, capped with Teflon squares and plastic end <br /> caps, and sealed in ZiplockTM-style bags The samples were placed on ice for transport to the <br /> laboratory accompanied by chain-of-custody documentation All down-hole drilling and <br /> sampling equipment was steam-cleaned following the completion of the soil boring Down-hole <br /> sampling equipment was washed in a LiquinoxTM solution between samples <br /> Groundwater Sampling Procedures <br /> Upon reaching the target sampling depth, a hydropunch tip with a slotted PVC screen was <br /> inserted in the drive rods and driven approximately 3 feet into undisturbed sod A water level <br /> indicator was run down in the inside of the drive rods to verify the no was present prior to <br /> exposing the hydropunch tip This verifies that no water is leaking into the rods and that only <br /> target water will be sampled Following verification that the drive rods are not leafing, the rods <br /> were retracted approximately two feet to expose the hydropunch tip and come into contact with <br /> groundwater Groundwater grab samples were collected from each hydropunch sampling point <br /> . using a pre-cleaned stainless steel bailer <br /> Collected water samples were placed in laboratory provided 40-m1 glass vials and one liter <br /> amber bottle Labels documenting sample number, collection date and time, and preservation <br /> were affixed to each sample The samples were then placed into an ice-filled cooler for delivery <br /> under chain-of-custody to a California Department of Health Services Environmental accredited <br /> laboratory <br /> Laboratory Procedures <br /> Groundwater samples were analyzed for the presence of TPHg, BTEX, and fuel oxygenates <br /> TBA, MtBE, DIPE, EtBE, TAME, 1,2-DCA, EDB and ethanol by EPA Method 82608 <br />