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C A M B R I A 0 August 12, 2004 Mr Richard Stiffler City of Stockton Department of Municipal Utilities J Environmental Control Section 2500 Navy Drive Stockton,CA 95206-1191 AUG y 6 2004 Re 5-Day Incident Report r-NVJRONIALNi HEALTH Shell-branded Service Station PFR IWSFHVICES 2575 Country Club Blvd Stockton, California Incident 98996184 SAP 136144 Dear Mr Stiffler On behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell), Cambria Environmental Technology,Inc (Cambria)presents this 5-Day Incident Report for the referenced site to document • the recent accidental discharge of untreated groundwater into a City of Stockton storm drain inlet At approximately 18 05 on August 5,2004,Cambria technician Paul Rasmussen arrived at the subject site on a routine visit and discovered that water was overflowing from the groundwater extraction (GWE) system transfer tank and flowing into a storm dram mlet on Plymouth Road,via the gutter on Country Club Boulevard Rasmussen munediately shut the system down and plugged the drop inlet to prevent any additional water from entering the storm dram Cambria contacted the fire department, which called out its hazardous material unit and notified all other applicable agencies, including the City of Stockton's Environmental Control Section Responding personnel determined that water from the storm drain inlet flows to the"Wisconsin"pump station# 1614,approximately 1-2 miles away Fire department personnel removed several manhole covers along the flow path to ensure that explosive conditions were not present in the sewer As required by the City of Stockton,Cambria scheduled a hcensed cleanup company(Philhps Services Corporation)to clean the storm drain line between the storm drain mlet on Plymouth Road and the manhole located on Oxford Street The line was plugged at Oxford Street and flushed using a rotovac truck The rinse water was collected and stored in a baker tank at the Shell site When this work was Cambria Environmental completed at approximately 19 30 on August 6,2004, a slug of water was sent through the line and Technology,Inc samples of the water were collected downstream by Cambria and by the City It should be noted that 0Tkins Street the City of Stockton representative,Don Bowles, used a non-standard method of sample collection ox 259 Sonoma,CA 95476 Tel(707)935-4850 Fax(707)935-6649