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Mr. Gerald Djuth Page 2 of 3 The accident did not occur at the intersection of McKinley and Industrial but rather about 400 feet north of the intersection where McKinley diagonally crosses three tracks. The point of collision was on the southeast side of the crossing. The precise location can be identified as the fifth and sixth ties south of a "V" mark painted on the easternmost outboard rail. This mark is visible in the EHD photos. For future reference, the V mark is perpendicular to a pole that was apparently damaged in the collision. The pole marks the location of a Kinder Morgan underground petroleum pipeline. The outboard portion of the spill area is now covered by a stockpile of railroad ballast rock ranging from about two to four feet in height. However, the original ballast is exposed near the tracks and shows no visible or olfactory evidence of diesel. In the attached photos taken on February 24, the stockpiled ballast is darker in color than the original; however this is not due to staining. The immediate area near the spill and a UPRR shack is graded flat and retains stormwater. The attached photos show puddles adjacent to the spill area which evidenced no impact by hydrocarbons (no sheen or odor). South of the UPRR shack, the topography falls about five feet to a small slough approximately 120 feet south of the spill location. Flow in the slough is toward the south. There was no visible evidence of diesel impact in the rainwater puddles between the spill site and the slough, or along or within the slough. Near the slough is a marker for a Quest Communications fiber optic line. h1 my opinion, the spill does not threaten or potentially threaten beneficial uses of groundwater or surface water; no further action is needed to protect human health or the environment. • A significant barrier of low permeability clay and silt is present between the surface spill and groundwater. Based on our investigation of the Wilbur Ellis facility 500 feet to the southeast, the soil type from the ground surface to a depth of 20 feet or more consists of low permeability clay and silt. Groundwater occurs at an average depth of approximately 30 feet and flows toward the northeast. No significant hydraulic connection between the nearby slough and groundwater appears to exist. • Such a small diesel release as this would not be expected to infiltrate or leach to groundwater at detectable concentrations due to the low mobility of the hydrocarbon and the high attenuation potential of the soil column. • The inspection did not discover any visible or olfactory evidence of the spill, either on the railroad ballast rock or in the adjacent rainwater puddles. Much of the original spill was probably removed with the applied absorbent. The residual diesel has likely undergone biodegradation during the two years since the occurrence. • Diesel fuel which might have penetrated the ballast would have become immobilized in the underlying clay and silt by sorption where it would be subject to degradation. • It does not appear that rainwater runs off toward the slough except possibly during major storni events. G:\GROUNDZE\ANDRADE\I_cticrtoR WQCB031909.doc