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SIJECOR
<br />�} hilermiliowd Incoiporated
<br />June 13, 2001
<br />Project 077.43452.550
<br />Mr. Richard C. Prima, Jr.
<br />City of Lodi Public Works Director
<br />221 West Pine Street
<br />Lodi, CA
<br />14- 2041
<br />y mit -j
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<br />RE: Discharge Report for May 2001
<br />Former Chevron Service Station 49-5775
<br />301 West Kettleman Lane
<br />Lodi, California
<br />Cleanup and Abatement Order No. 5-00-704
<br />Wastewater Discharge Permit #295
<br />Dear Mr. Prima:
<br />SECOR International Incorporated (SECOR), on behalf of Chevron Products Company
<br />(Chevron), presents operating data for the groundwater extraction (GWE) system at the
<br />• site referenced above (Figures 1 and 2). Chevron discharges treated groundwater at the
<br />subject site under City of Lodi Wastewater Discharge Permit #295.
<br />Extraction and treatment of groundwater was initiated on July 3, 2000. The GWE
<br />system extracts groundwater from site wells EX -1, MW-14/EX-2, and EX -3. Extracted
<br />groundwater is routed through a particulate filter, then three 2,000 -pound liquid phase
<br />activated carbon vessels (A, B, and C) plumbed in series. A treatment system schematic
<br />is shown on Figure 3.
<br />Summary of GWE System Operation
<br />Samples were collected from the influent port, midpoint 1 (between carbon vessels A
<br />and B), midpoint 2 (between carbon vessels B and C), and the effluent port on May 2, 9,
<br />17, 23, and 30, 2001. During these sampling events, influent, midpoint 1 (mid -1),
<br />midpoint 2 (mid -2), and effluent samples were analyzed for total petroleum
<br />hydrocarbons as gasoline (TPHg), benzene, toluene, ethyl -benzene, and total xylenes
<br />(BTEX compounds), methyl tertiary butyl ether (MtBE), tertiary butyl alcohol (TBA),
<br />di -isopropyl ether (DIPE), ethyl tertiary butyl ether (EtBE), tertiary amyl methyl ether
<br />(TAME), ethanol, methanol, ethylene dibromide (EDB), and 1,2-dicholoethane (1,2 -
<br />DCA). Maximum concentrations of detected constituents are presented below:
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