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1 <br /> <br />:~ <br />a <br />i <br />n <br />a <br />a , <br />Y <br />t <br />i <br />~; <br /> <br />I, <br /> <br />Some problems were identified in the analytical results for total <br />zinc after inspection of the first few weeks of sampling. Re- <br />analysis of samples which were still held by the laboratory <br />confirmed that the original values reported by the laboratory <br />were in error, sometimes by as much as two orders of magnitude. <br />For this reason, the early results for total zinc, which could <br />not be re-analysed, are not included. in Tables 6 and 8. As a <br />result of the analytical problems, a quality assurance program, <br />involving split sampling and analysis by a second laboratory, has <br />been recommended which is described later. <br />2.2 Pond F Spring Monitoring <br />Weekly flow and water quality monitoring of the spring issuing <br />for backfill material near Sedimentation Pond F commenced in <br />early June to establish the characteristics of the discharge. <br />The major objective of this monitoring is to establish whether <br />the discharge routed through Pond F could meet the tdPDES <br />discharge limitations. Since the original limitations were <br />imposed for surface water runoff new limitations are presently <br />being proposed for the Pond F outflow (point 007). Evaluation of <br />the data from this source is covered in a separate report but the <br />data is used for comparison in the evaluation of the <br />characteristics of inflows_to Pond D. <br />2.3 Ambient Stream Monitoring <br />A concurrent sampling program was initiated at this time which <br />was designed to obtain water. quality data from streams. in the <br />area that were above any historic mining activities. Four sites <br />were chosen: <br />'-~ Site 31. on Middle Creek ._:_ __ <br />Sites 14 and 33 on Foidel Creek <br />Site 1001 on Fish Creek _.. ,_.._ <br />Emphesis was placed on obtaining. ambient. water quality data on <br />parameters: which are included on existing NPDES permits, or may <br />be included in the forseeable future. The primary purpose of <br />this sampling program is to establish a data base which would <br />support a petition to change the existing stream water quality <br />standards for several parameters. The present stream standards <br />are believed to be lower. than average ambient conditions for <br />parameters such as silver and manganese. If these standards are <br />used_as the discharge limitations on NPDES permits, complience <br />becomes very difficult. <br />