ARCHIVED REPORTS XR0003051 - Laserfiche WebLink

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Chevron Products Company Page t Former Chevron Service Station #9-5775, 301 West Kettleman Lanc, Lodi. Cali lomia October 12, 2001 1* ' INTRODUCTION SECOR International Incorporated (SECOR), on behalf of Chevron Products Company (Chevron), presents operating data for the groundwater extraction (GWE) 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. This report presents September 2001 data collected between September 5 and September 26, 2001, GROUNDWATER EXTRACTION SYSTEM ' Extraction and treatment of groundwater was initiated on July 3, 2000. The groundwater extraction system consists of groundwater extraction wells EX -1, EX -2 and EX -3 (Figure 2). ' These wells are equipped with submersible pumps connected through mechanical piping to a series of granular activated carbon (GAC) vessels prior to an industrial sewer discharge point. Pumping through the wells from areas affected by petroleum hydrocarbons prevents ' migration of these hydrocarbons off-site. A treatment system schematic is shown on Figure 3. ' To assess effectiveness of the GWE system, process samples were collected weekly during this reporting period. Sample locations include an influent port (fNFL), prior to the first GAC vessel, between the first and second GAC vessels (MID -1), between the second and third GAC vessels (MID -2), and prior to discharge (EFFL) to the industrial sewer. During these sampling events, influent (ML), midpoint 1 (MID -1), midpoint 2 (MID -2), and ' effluent (EFFL) samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethyl -benzene, and total xylenes (BTEX compounds), methyl tertiary butyl ether (MtBE), tertiary butyl alcohol (TBA), di -isopropyl ether (DIPE), ethyl tertiary butyl ' ether (ELBE), tertiary amyl methyl ether (TAME), ethanol, methanol, ethylene dibromide (EDB), and 1,2-dicholoethane (1,2 -DCA). Maximum concentrations of detected constituents are presented below. Current and historical analytical information is presented as Table 1.