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r1 Chevron Products Company 3 <br /> Chevron T rnunal 1001621 22888 Kasson Road Banta CA januaKy 30 2002 <br /> • Temperature in groundwater has declined in all wells since the test inception <br /> Changes in temperature may be related to seasonal atmospheric temperatures <br /> . • Conductivity (specific conductance) of groundwater has generally decreased since the <br /> beginning of the test, <br /> • Oxidation-reduction potential (ORP) exhibits a general downward trend following a <br /> distinctive rise in early to mid-October in most wells, <br /> • pH has generally increased,ranging from 6 7 to 7 5 in August 2001 to 7 0 to 10 6 in <br /> December 2001 <br /> • Depth to groundwater has generally increased (groundwater elevation decrease) which <br /> may be attributable to seasonal precipitation/infiltration <br /> Groundwater samples are routinely collected from wells MW-24A through MW-32A <br /> Review of the laboratory test results between August 17, 2001 and December 28, 2001 <br /> suggest <br /> • After a distinctive decrease in TPHd and MtBE concentrations in MW-24A and MW- <br /> 25A, TPHd concentrations have generally increased while MtBE concentrations <br /> remain about the same, <br /> • After a sharp increase in TPHd and MtBE concentrations in MW-26A, TPHd <br /> concentrations have decreased while MtBE concentrations remain about the same, <br /> • TPHd concentrations in MW-27A increased by approximately 400 percent while <br /> MtBE levels decreased <br /> • MW-29A exhibited decreasing TPHd concentrations and minimal changes in MtBE <br /> concentrations, <br /> • MW-28A and MW-30A through MW-32A exhibited decreases in TPHd and MtBE <br /> concentrations, <br /> • General inorganic parameters were collected including manganese, alkalinity, nitrate, <br /> nitrate, total organic carbon, sulfate and chemical oxygen demand No obvious trend <br /> or remarkable results are observable, <br /> • Samples were not analyzed for methanol and ethanol during this period, <br /> Test wells TW-5 and TW-6 appeared to operate continuously during the period and the <br /> nearby local monitoring wells had measured dissolved oxygen levels between 6 57 <br /> milligrams per liter(mg/L) and 7 99 mgfL All wells sampled in this area exhibited some <br /> decrease in TPHd concentrations All wells except for MW-29A exhibited some decrease in <br /> MtBE concentrations <br /> 11Chevron110016211REPORTS11SO-GEN Mouthly\ISOGEN status report3 doc <br />