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Jim Tjosvold <br /> Page 3 <br /> July 3 , 1987 <br /> approach and schedule of activities for defining the <br /> northern edge of the groundwater plumes. <br /> 10. Considering the fairly substantial daily fluctuation in <br /> monitoring well water levels, controls need to be <br /> implemented to insure consistency of data during <br /> collection of water level data. Such controls could <br /> consist of 1) continuous water level recorders in some <br /> wells, 2) recording levels in certain wells at the <br /> beginning and end of the measurement times, or 3) any <br /> other acceptable method McCormick and Baxter can propose <br /> to account for the daily fluctuations. <br /> Water Quality Monitoring <br /> 11. The General Scan analysis suite is proposed for all the <br /> existing and new wells. Analysis by the General Scan <br /> methods can exclude existing wells A-3, 4, 7, and 9; <br /> DSW1-B, C, and D; and DSW5-B. <br /> 12 . Any sample analysis subcontracted to another laboratory <br /> must be indicated in the appropriate technical report. <br /> The laboratory must be State certified for the specific <br /> method of analysis which would be performed. <br /> 13 . In addition to EPA method 601 and 602 , confirmation of <br /> all samples by GC/FID and CPAR must be performed on all <br /> results above the detection limit by a second GC column <br /> or GC/MS. If concentrations for any confirmation are <br /> below GC/MS detection levels, a second GC column must be <br /> used. Subsequent confirmation of constituents found in <br /> each well during regular scans must also be confirmed <br /> each time. <br /> 14 . Information on equivalency testing for methods GC/FID and <br /> CPAR must be provided before the methods will be <br /> accepted. Data from duplicates, spike recovery, <br /> calibration curves, detection levels, and confirmation <br /> testing must be provided to and analyzed by the State's <br /> Hazardous Materials Laboratory. The CH2M Hill laboratory <br /> must contact Fred Seto at (415) 540-3003 for additional <br /> information. <br /> 15. Test methods for metal analysis on water samples must be <br /> specified. Detection limits which can be achieved by the <br /> laboratory must be listed. In an effort to reduce costs, <br /> a large majority of the Title 22 metal scan may be <br /> analyzed by inductive coupled argon plasma (ICAP) at <br /> approximately half the cost of atomic absorption (AA) . <br /> 16. No provisions for turbid water samples have been <br /> addressed. Samples must not be filtered before analysis. <br /> Analyzing filtered samples, in addition to the unfiltered <br />