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Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration 158 f. Field personnel will routinely inspect the work site to verify that the Spill Prevention and Response Plan is properly implemented and maintained. Staff will notify contractors immediately if there is a noncompliance issue and will require immediate correction of any noncompliant behavior. g. Absorbent materials will be used on small spills located on impervious surface rather than hosing down the spill; wash waters shall not discharge to the storm drainage system or surface waters. For small spills on pervious surfaces such as soils, wet materials will be excavated and properly disposed rather than burying it. The absorbent materials will be collected and disposed of properly and promptly. As defined in 40 CFR 110, a federal reportable spill of petroleum products is the spilled quantity that: a) Violates applicable water quality standards; b) Causes a film or sheen on, or discoloration of, the water surface or adjoining shoreline; or c) Causes a sludge or emulsion to be deposited beneath the surface of the water or adjoining shorelines. h. If a spill is reportable, the contractor will notify the DWR staff, and the DWR staff will take action to contact the appropriate safety and cleanup crews to ensure that the Spill Prevention and Response Plan is followed. A written description of reportable releases must be submitted to the Regional Board and the California Department of Toxic Substances Control (DTSC). This submittal must contain a description of the release, including the type of material and an estimate of the amount spilled, the date of the release, an explanation of why the spill occurred, and a description of the steps taken to prevent and control future releases. The releases will be documented on a spill report form. i. If a significant spill has occurred, and results determine that project activities have adversely affected surface water or groundwater quality, a detailed analysis will be performed to the specifications of DTSC to identify the likely cause of contamination. This analysis will include recommendations for reducing or eliminating the source or mechanisms of contamination. Based on this analysis, the DWR or contractors will select and implement measures to control contamination, with a performance standard that surface, and groundwater quality must be returned to baseline conditions. These measures will be subject to approval by the DWR, DTSC, and the Regional Board.