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Chevron Products Company 2 Chevron Terminal 1001621,22888 Kasson Road,Banta CA February 28.2002 SYSTEM PERFORMANCE AND MAINTENANCE: The following activities were performed during this period • A routine inspection was conducted on January 24 and 25, 2002 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 included 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 notes from weekly inspections are included as Attachment C • Groundwater quality samples were collected on January 24 and 25, 2002, 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 —Field Parameters Water samples were then collected and analyzed for organic compounds and chemical parameters o Organic compounds include total petroleum hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd),benzene, toluene, ethylbenzene, and xylenes (BTEX), and fuel oxygenates, . o Chemical paramenters include total alkalinity, dissolved iron, manganese, sulfate, nitrate, total organic carbon, 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 operated intermittently from December 28, 2001 through January 24, 2002 TW-5 and TW-6 operated continuously throughout the reporting period, • On January 24, 2002 ISO-GEN test wells TW-1, TW-2, TW-3 and TW-4 were found to be inoperative, ISO-GEN controllers were reset and reactivated DISCUSSION OF CONCENTRATIONS Field measurements and laboratory test results collected during this reporting period are summarized in Table 1-Field Parameters and Table 2-Groundwater Analytical Data Review of the field parameters suggests • Four of seven upper-A wells (MW-36UA,MW-37UA,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, I\Chevron1100162 11Pernodic Monttortng\ISO GEN MonthlyVan 02 ISOGBN status report doc