FIELD DOCUMENTS AND WORK PLANS 1992-1999

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TABLE 1 PROPOSED REVISED GROUNDWATER MONITORING SAMPLING SCHEDULE MARLEY COOLING TOWER COMPANY STOCKTON, CALIFORNIA WELL INFORMATION SAMPLING CRITERIA WELL ID ALT.ID ZONE WELL TYPE CURRENT RECOMMENDED FREQUENCY RATIONALE FOR CHANGING MONITORING MW-325 Intermediate Monitor Annual Every 2 years Chromium Concentrations at or Below 0.01 mgll for past 9 years MW-326 Intermediate Monitor Annual Every 2 years Chromium Concentrations at or Below 0.01 mgll for past 3 years MW-327 Intermediate Monitor Annual Every 2 years Chromium Concentrations at or Below 0.01 mg/I for past 9 years MW-328 Intermediate Monitor Annual Every 2 years Chromium Concentrations at or Below 0.01 mgll for past 9 years MW4 Intermediate Monitor Annual Annual MW420 Intermediate Monitor Annual Every 2 years Chromium Concentrations at or Below 0.01 mg/I for past 8 years MW421 Intermediate Monitor Annual Every 2 years Chromium Concentrations at or Below 0.01 mgll for past 8 years - MW-422 Intermediate Monitor Semiannual Every 2 years Chromium Concentrations at or Below 0.01 mg/I for past 5 years MW423 Intermediate Monitor Semi-annual Every 2 years Chromium Concentrations at or Below 0.01 mgll for past 4 years MW-425 Intermediate Monitor Annual Every 2 years Chromium Concentrations at or Below 0.01 mg/I for past 7 years MW-426 Intermediate Monitor Annual Annual MW-428 Intermediate Monitor Semiannual Every 2 years Chromium Concentrations at or Below 0.01 mgll for past 4 years MW-430 Intermediate Monitor Annual Every 2 years Chromium Concentrations at or Below 0.01 mgll for past 5 years- MW-431 Intermediate Monitor Annual Every 2 years Chromium Concentrations Below 0.01 mgll for past 10 years MW-432 Intermediate Monitor Annual Every 2 years Chromium Concentrations at or Below 0.03 mgll for past 10 years MW-433_ Intermediate Monitor Annual Every 2 years Chromium Concentrations Below 0.01 mg/1 for past 10 years MWA34 Intermediate Monitor Semiannual Every 2 years Chromium Concentrations Below 0.01 mg/I for past 10 years MW-435 Intermediate Monitor Annual Every 2 years Chromium Concentrations Below 0.01 mg/1 for past 10 years MW-437 Intermediate Monitor Annual Every 2 years Chromium Concentrations Below 0.01 mg/I for past 10 years MW-438 Intermediate Monitor Annual Every 2 years Chromium Concentrations at or Below 0.01 mg/I for past 3 years MW-440 Intermediate Monitor Annual Every 2 years Chromium Concentrations at or Below 0.01 mg/I for past 7 years MW-441 Intermediate Monitor Annual Every 2 years Chromium Concentrations Below 0.01 mg/I for past 10 years _ MW-442 Intermediate Monitor Annual Every 2 years Chromium Concentrations Below 0.01 mg/1 for past 9 years MW-443 Intermediate Monitor Semi-annual Every 2 years Chromium Concentrations at or Below 0.01 mgll for past 6 years MW444 Intermediate Monitor Semi-annual Every 2 years Chromium Concentrations Below 0.01 mg/I for past 6 years MW-445 Intermediate Monitor Semi-annual Semi-annual - MW446 Intermediate Monitor Annual Every 2 years Chromium Concentrations at or Below 0.05 mgll for past 4 years 1-10 MW-324 Intermediate Reclamation Semi-annual Semi-annual I-2 MW-424 Intermediate Reclamation Semi-annual Semi-annual 1-3 MW-427 Intermediate Reclamation Semi-annual Semi-annual 1-4 MW-429 Intermediate Reclamation Semi-annual Semi-annual 1-5 MW-436 I Intermediate Reclamation Semi-annual Semi-annual I-6 MW-439 Intermediate Reclamation Serni-annual Semi-annual I-7 MW-213 Intermediate Reclamation Semi-annual Semi-annual 1-8 MW-214 Intermediate Reclamation Semi-annual Semi-annual I-9 MW-321 Intermediate Reclamation Semi-annual Semi-annual MW-361 Deep Monitor Annual Every 2 years Chromium Concentrations at or Below 0.01 mg/I for past 11 years MW-364 Deep Monitor lAnnual Every 2 years Chromium Concentrations Below 0.01 mg/l for past 12 years _ MW460 Deep Monitor lAnnual Every 2 years Chromium Concentrations Below 0.01 mg/I for past 10 years 11/29/1999 NewMon 3 of 4 11:34 AM Criteria