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rt rti Chevron Products Company 2 Chevron Termmal 1001621 22888 Kasson Road Banta CA lana 30 2002 SYSTEM PERFORMANCE AND MAINTENANCE: The following activities were performed during this period • Routine inspection was conducted on December 27, 2001 Routine inspections include operational checks, and measuring depth to water (DTW), turbidity, dissolved oxygen, conductivity, oxygen reduction potential, PH and temperature in select wells within the ISO-GEN monitoring network Wells included in the ISO-GEN monitoring network are monitoring wells MW-24A through MW-32A, MW-36UA through MW-42UA, and MW-7A, MW-14A, MW-15A,MW-18A, and MW-19A ISO-GEN units are deployed in test wells TW-1 through TW-6 See Figure 2- ISO-GEN Site Plan Field and laboratory procedures are included as Attachment B Field notes from inspections are included as Attachment C • Groundwater quality samples were collected on December 27 and 28, 2001 from select ISO-GEN monitoring wells MW-24A through MW-32A Each well was purged prior to sampling and field parameters were measured Field parameters are summarized in Table 1 Water samples were then collected and analyzed for organic compounds and inorganic compounds o Organic compounds include total organic carbon (TOC), total petroleum hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), benzene, toluene, ethylbenzene, and xylenes (BTEX), and fuel oxygenates, o Inorganic compounds include total alkalinity, dissolved iron, manganese, sulfate, nitrate, ferrous iron and chemical oxygen demand Laboratory analytical results are summarized in Table 2 --Groundwater Analytical Data Field and laboratory procedures are included as Attachment B Analytical Reports with chain-of-custody records and field data sheets are included as Attachment C • ISO-GEN units in TW-1, TW-2, TW-3 and TW-4, TW-5 and TW-6 operated continuously throughout the reporting period DISCUSSION OF CONCENTRATIONS Field measurements and laboratory test results collected during this reporting period are summarized in Table I- Field Parameters and Table 2—Groundwater Analytical Data Review of the field parameters suggest • Five of seven Upper-A wells (MW-36UA, MW-37UA, MW-38UA, MW-40UA and MW-42UA) and two of fourteen A-wells (MW-7A and MW-14A) contained either a sheen or separate phase hydrocarbons during the monitoring event and field parameters were not collected, • Dissolved oxygen concentrations are generally higher than the baseline levels • measured in August or October, 2001 and in some cases over an order of magnitude greater, 11Chevron110016211REPORTSIiSO-GEN MonthlyllSOGEN status repor-0 dor-