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fII,-- <br />6ETTLER-RYANINC <br />54 <br />September 19, 2000 <br />Mr. Richard C. Prima, Jr. <br />City of Lodi Public Works Director <br />221 West Pine Street <br />Lodi, CA 95240 <br />Subject: Discharge Report for August 2000, Wastewater Discharge Permit #295, Former <br />Chevron Station #9-5775, 301 West Kettleman Lane, Lodi, CA. <br />Mr. Prima: <br />Gettler-Ryan Inc. (GR) has prepared this report at the request of Chevron Products Company. Chevron <br />discharges treated groundwater to the industrial sewer under City of Lodi Wastewater Discharge Permit <br />#295. Extraction and treatment of groundwater at the subject site was initiated on July 3, 2000. The <br />groundwater system (GWS) extracts impacted groundwater from well EX -1. Extracted groundwater is <br />. routed through a particulate filter, then three 2,000 -pound liquid phase activated carbon vessels plumbed in <br />series. Locations of the treatment system compound and well EX -1 are shown on Figure 2. A treatment <br />system schematic is shown on Figure 3. <br />Summary of Violations <br />Midpointl, Midpoint2 and Effluent samples collected on August 16, 2000, contained detectable <br />concentrations of petroleum hydrocarbons. After collection of confirmation samples on August 18, 2000, <br />the GWS was shut down. Analytical data indicated the most likely source for the detected compounds was <br />the glue used to assemble the GWS piping. The system was flushed and restarted on August 23, 2000. <br />Confirming samples collected on August 23 did not contain hydrocarbon compounds. This was reported to <br />the City of Lodi in a letter dated August 31, 2000. <br />Carbon Change Out <br />Due to detection of 20.2 parts per million (ppm) of methyl tert-butyl ether (MtBE) in the sample collected <br />July 26, 2000, from Midpoint i (between the first and the second carbon vessels), GR contracted with US <br />Filter/Westates to change out the carbon in the first carbon vessel. US Filter/Westates changed this carbon <br />on Monday, August, 7, 2000. The GWS was sampled again on August 3, 2000, prior to carbon change out., <br />however, results of this second sample set were not received from the laboratory prior to carbon change out. <br />Petroleum hydrocarbons were not detected in the second sample from Midpoint 1. <br />346408.07 <br />6747 Sierra Court, Suite J 9 Dublin, California 94568 • (925) 551-7555 <br />