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CO2400614 1000 E. Roth Rd. French Camp, CA 95213 12/27/24—Phase 2 of Clean-up Incident Narrative: EHD arrived on site at approximately 9:30am. GrayMar and Arcadis clean-up contractors were already on-site.The burnt crane and container had been removed from the incident location and were being stored across several parking spots adjacent nearby.Arcadis informed EHD that GrayMar had arrived on-site earlier and cleaned the remaining debris that was under the container that could not be reached during phase 1 of cleanup.Two 55-gallon drums of solid waste (burnt debris) and four 55-gallon drums of liquid waste were generated. The clean-up crew initially focused on determining the direction and destination of flow of the storm drain. By introducing water into the storm drain,the direction of flow was found to be north toward the retention pond at the northwest corner of the property near Roth Road. It was discovered that the water flowed from the storm drain grate line laterally a few feet to a culvert that transports it to the retention pond.The French Camp Outlet Canal runs parallel to the west side of the property. EHD and Arcadis drove to the canal bank and observed no outfall along the length of canal adjacent to or below where water was being introduced into the storm drain system to ensure that there was off site outlet. Following mapping the pathway of the water, 500-gal water was introduced above the site of the incident from parking spot 572 to flush the line.This was done twice (total 1000-gal). The north end of the retention pond was observed to contain approximately 2 feet of standing water. A significant sheen was observed.The retention pond is fitted with a manual valve(SW-02)that opens to the French Camp Outlet Canal. Scott Hackman,Arcadis, confirmed with Brian Beezer (Union Pacific, MIFO)that the valve has"never"been opened. EHD observed the canal adjacent to the valve and observed no outfall.Arcadis obtained the facility's SWPPP from Union Pacific and confirmed that it was a General Stormwater Permit, and no release notifications were required. GrayMar entered the south end of the retention pond,which contained a small stream of water flowing north.The pipe carrying water into the retention pond was observed to contain thick oily material, and sheen was observed inconsistently along the stream. GrayMar suggested that the thick oily material may not be part of this incident, however Arcadis determined it would all be treated as petroleum contaminated liquid and cleaned up. GrayMar began removing the contaminated vegetation along the path of the flowing water but left them in place to be bagged and removed with additional materials that would be delivered tomorrow.They made it approximately a quarter of the way down the retention pond, laying absorbent booms in three locations before clean-up was concluded for the day due to limited lighting and plans were made to return at 7am the following morning to continue cleanup with additional materials.