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SECOR Iniet iiational lncw poryled April 12, 2001 Project 077 43452 550 Mr Richard C Prima, Jr City of Lodi Public Works Director 221 West Pine Street Lodi, CA RE Discharge Report for March 2001 Former Chevron #9-5775 301 West Kettleman Lane Lodi, California Cleanup and Abatement Order No 5-00-704 Wastewater Discharge Permit #295 Dear Mr Prima SECOR International Incorporated (SECOR), on behalf of Chevron Products Company (Chevron), presents operating data for the groundwater extraction (GYVE) system at the site referenced above (Figures 1 and 2) Chevron discharges treated groundwater at the subject site under City of Lodi Wastewater Discharge Permit #295 Extraction and treatment of groundwater was initiated on July 3, 2000 The GWE system extracts groundwater from site wells EX -1, MW-14/EX-2, and EX -3 Extracted groundwater is routed through a particulate filter, then three 2,000 -pound liquid phase activated carbon vessels (A, B, and C) plumbed in series A treatment system schematic is shown on Figure 3 Summary of GWE System Operation Samples were collected from the influent port, midpoint 1 (between the first and second carbon vessels), midpoint 2 (between the second and third carbon vessels), and the effluent port on March 7, 14, 21, and 28, 2001 During these sampling events, total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, xylenes (BTEX compounds), di -isopropyl ether (DIPE), were not detected in influent, midpoint 1 (mid - 1), midpoint 2 (mid -2), or effluent samples Maximum influent concentrations of methyl tertiary butyl ether (MtBE), tertiary butyl alcohol (TBA), ethyl tertiary butyl ether (EtBE), and tertiary amyl methyl ether (TAME) were reported as 2,400 ug/l, 85 ug/l, 100 ug/l, 23 ug/l, respectively Methanol and toethanol were reported in mid -1 at maximum concentrations of 57 ug/l and 7 8 ug/l, 3017 Adgore Road Swle 100 Rancho (ordoia CA 95070 9161361 0400 916 861 0450 Fal 111111 secol Cana