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6ETTLER-RYAN INC. r August 31, 2000 Mr Richard C Prima, Jr City of Lodi Public Works Director 221 W Pine Street Lodi, CA 95240 Subject: Accidental Discharge Report, Wastewater Discharge Permit 0295, Former Chevron Station #9-5775,301 West Kettleman Lane, Lodi, CA. Mr Prima Gettler-Ryan Inc (GR) has been contracted by Chevron Products Company (Chevron) to operate and maintain the groundwater system (GWS) installed at the subject site GR prepared this report to document an unintentional discharge of impacted water from the GWS to the City of Lodi industrial sewer (Permit #295) Extraction and treatment of groundwater at the subJect site was initiated on July 3, 2000 The GWS extracts • impacted groundwater from well EX -1 Extracted groundwater is routed through a particulate filter, then three 2,000 -pound liquid phase activated carbon vessels plumbed in series Locations of the treatment system compound and well EX -1 are shown on Figure 2 A treatment system schematic is shown on Figure 3 Carbon Change Out Due to detection of 20 2 parts per million (ppm) of methyl tent -butyl ether (MtBE) in the sample collected August 26, 2000, from Midpoint I (between the first and the second carbon vessels), GR contracted with US Filter/Westates to change out the carbon in the first carbon vessel US Filter/Westates changed this carbon on Monday, August, 7, 2000 However, the GWS was sampled again on August 3, 2000, prior to carbon change out Results of this second sample set were not received from the laboratory prior to carbon change out Petroleum hydrocarbons were not detected in sample Midpoint 1 Hydrocarbons in Effluent Sample The August 16, 2000, sample results were received from Sequoia Analytical on August 18, 2000 Low concentrations of petroleum hydrocarbons were present in all four of the samples (Influent, Midpoint 1, Midpoint 2, and Effluent), and the MtBE concentration in the influent sample was initially reported at 13,400 ppb Sequoia's report indicated that the chromatogram patterns for the Effluent, Midpoint 2 and Midpoint 1 samples indicated weathered gasoline C-6 to C-12, and the chromatogram for the influent sample indicated unidentified hydrocarbons C6 -C8 These data appeared suspect because the influent MtBE concentrations were abnormally low compared to previous results Also, the carbon in one of the vessels had Just been Is 346408 07 6747 Sierra Court, Suite J 9 Dublin, California 94568 • ( 9 2 5 ) 551-7555