FIELD DOCUMENTS AND WORK PLANS 2000-2003

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MONITORING AND REPORTfG PROGRAM • 4 THE MARLEY COOLING TOWER COMPANY STOCKTON, SAN 7OAQUIN COUNTY TENTATIVE Field testing instruments (such as those used to test ORP,pH, and dissolved oxygen)may be used provided that: 1. The operator is trained in proper use and maintenance of the instruments; 2. The instruments are calibrated prior to each monitoring event; 3. Instruments are serviced and/or calibrated by the manufacturer at the recommended frequency; and 4. Field calibration reports are provided with the appropriate monitoring report. Constituents Units Tyne of Sample Sampling Frequency' Oxygen Reduction Potential µg/1 Grab, In-situ See attached Table 1 (OR') for sodium dithionite pilot test, Table 3 for ethanol pilot test pH pH units Grab See attached Table 1 for sodium dithionite pilot test, Table 3 for ethanol pilot test Dissolved Oxygen mg/I Grab, In-situ See attached Table 1 for sodium dithionite pilot test, Table 3 for ethanol pilot test Ground Water Elevation Feet,MSL Grab Measured every time well is sampled 1 See attached Tables 1 and 3 for sampling schedule. MSL Mean Sea Level PHASE 2 PILOT TEST MONITORING A. LABORATORY ANALYSES Monitoring of the pilot study will consist of laboratory analysis of groundwater samples collected from MW-206, MT-2, MT-3, MT-4,MT-5,MT-7, MT-8, EW-2, EW-3, L-242, L-243, L-244,L- 301, L-302, L-303,L-304, L-305, L-306,L-307, L-308, and I-8 (MW-214). Laboratory analysis shall be conducted by a State certified laboratory. Constituents Units Type of Sample Sampling Frequency' Hexavalent Chromiuml µg/1 Grab See attached Table 2 for sodium dithionite pilot test, Table 4 for ethanol pilot test Total Chromium2 µg/1 Grab See.attached Table 2 for sodium dithionite pilot test, Table 4 for 08/22/02 1:15 PM Marley Cooling