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It <br /> Table 4-1 <br /> Calibration Standards and Suppliers <br /> Instrument Calibration Standard Supplier <br /> M-, FHNu <br /> meter pH 4, 6.8, 10 buffers EFiscr Scientific <br /> nductivity meter EC 225, 1,000 µmhos/cm Tustin, California <br /> Benzene, 55 ppm HNu Systems, Inc. <br /> Newton Highlands, <br /> Massachusetts <br /> Equipment that fails calibration or becomes inoperable during use will be removed <br /> from service and either segregated to prevent inadvertent use or tagged to indicate it is <br /> out of calibration. Such equipment will be repaired and satisfactorily recalibrated. <br /> Equipment that cannot be repaired will be replaced. <br /> Results of activities performed us;ng equipment that has failed recalibration will be <br /> evaluated. If the activity results are Aversel/affected, the results of the evaluation will <br /> be documented and the appropriate p.-solmel notified. <br /> Calibration instructions will be included with each instrument and will accompany the <br /> instrument to the field. <br /> 4.6 ANALYTICAL PROCEDURES <br /> Lab-specific method and target detection Iimits are the same for this study. <br /> All <br /> samples will be analyzed using EPA- and California-rpproved procedures as shown in <br /> Table 3-1 in Section 3. <br /> 4.7 INTERNAL QUALITY CONTROL <br /> The field sampling team leader will be responsible for ensuring that the field QA sam- <br /> ples are collected. Duplicate soil samples will be collected to check for variability in <br /> soil parameter levels. When a duplicate sample is needed, two brass sleeves or two <br /> glass jars of the soil sample will be submitted for analysis, one will be the sample and <br /> the other the duplicate. <br /> A duplicate water sample will be collected to check for variability in laboratory <br /> analyses. A field blank will also be collected and analyzed for volatile organic <br /> compounds. <br /> SF0315051WP\M51 4-14 <br />