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Envi <br /> nta <br /> Construction <br /> -De elopr Science st Engineering <br /> calm Con54ruttion•Development•Industrial•Municipal <br /> 45 Polk St reel,3rd Floor•San Fran lsco.Calltomia 94102.415.49"535.c7di mongirl"m nu.�m <br /> CDIM Standard Operating Procedure <br /> 2.2 Surface and Shallow Soil Sampling <br /> 1. PURPOSE <br /> This Standard Operating Procedure (SOP) establishes guidelines and procedures for <br /> collecting soil and sediment samples from the ground surface (0 to 6 inches in depth)and shallow <br /> subsurface from boreholes or open excavations (e.g., pits and trenches). Shallow subsurface <br /> samples include soil that is collected from depths between approximately 6 inches and 6 feet <br /> below ground surface (bgs), or soil that is removed from an excavation for confirmation sampling <br /> purposes. Collection procedures specific to the type of analyses being performed are integral to <br /> maintaining the quality and integrity of samples. It is imperative that hazardous substances are <br /> not introduced into the sample, and that sampling procedures and field protocols are performed <br /> consistently and in no way contribute to the migration or introduction of hazardous substances. <br /> Additional specific procedures and requirements will be provided in the project work plans, as <br /> necessary. <br /> Sampling near-surface, unconsolidated soil and sediment is generally conducted to: <br /> • Evaluate whether releases of hazardous substances have occurred from shallow <br /> underground sources, such as shallow buried pipes, or surface spills/leaks; <br /> • Determine the near-surface extent of a hazardous substance release; <br /> • Estimate the volume of shallow soil containing hazardous substances for <br /> removal, disposal, or treatment; or <br /> • Provide confirmation soil data following remediation or excavation. <br /> 2. DEFINITIONS <br /> 2.1 Surface Soil Sample <br /> Soil collected from the surface to a depth of no more than 6 inches bgs. <br /> 2.2 Shallow Subsurface Soil Sample <br /> Soil collected from a depth of 6 inches to approximately 6 feet. <br /> 2.3 Subsurface Soil Sample <br /> Soil collected at any depth interval greater than 6 inches. <br /> 2.4 Disturbed Soil Sample <br /> A soil sample whose in situ physical structure and fabric has been disturbed as the direct <br /> result of sample collection. <br />