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<br />S+ Section 2 (inclusive). BMG should reconsider the proposal to rinse all sampling <br />equipment with tap water and provide the Division evidence that the tap water at <br />San Luis, which is essentially groundwater, has a chemical composition similar <br />enough to that of the process water and to local surface water that concentrations of <br />evaporated salts on the sampling equipment will not affect any df the analyses <br />significantly. <br />7+ Second full paragraph. It is well known that agitation of samples containing CN-, in <br />the presence of C02, will cause CN- to volatalize. <br />Therefore, if samples are to be filtered after they have been transportied to a lab for <br />analysis, a study should be conducted showing that agitation duringtrarlsportation has <br />a negligible effect on cyanide concentrations. If the lab receives a container with <br />sample to be analyzed for CN- that is not completely full (or nearly so), or which <br />bears indications of leakage during shipment, that sample shall be noted by the lab. <br />If sufficient material remains to be sampled, that particular monitoring facility shall <br />be re-sampled. <br />8 Section 2.1.7. I believe the EPA method requires that bottles be stmred "below" 4 <br />degrees C rather than at "approximately" 4 degrees. BMG should check this figure <br />and respond accordingly. <br />13 Section 2.2.6. BMG or third-party samplers should make provisions for storing the <br />bailers, depth measuring devices, and other sampling equipment out pf the paths of <br />materials that could potentially contaminate the sampling materials. <br />14 Section 2.2.7. For those wells with a history of low to nil fluid ptoduction, the <br />presence of any fluid at all may be more important than the actual content of the <br />fluid or of the quality of the analysis, said quality having been affected by natural or <br />casing contaminants in the well. In these cases, the protocol should provide for <br />collecting a sample prior to evaluating the productiveness of the well. <br />The Division recommends that for ordinarily dry or low productivity collecting points, <br />if any fluid is available, a reasonable amount of that fluid should first be taken, then <br />the well should be purged according to the provisions in this section: If adequate <br />sample is collected under the more ideal, three volume purging protocol, the primary <br />sample should be discarded and not analyzed. Otherwise, the less ideally collected <br />primary sample should be analyzed and the properties of the collecting medium <br />properly noted. <br />16 First full paragraph. Three consecutive and consistent measurements of temperature, <br />pH and conductivity falling within the error limits of the measureunent method <br />should be collected before the well is sampled. However, in no case should failure <br />of the pH, conductivity, or temperature consistency tests compromise the ability to <br />collect a sample adequate for chemical analysis. <br />