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Ms. Lori Potter ~~~ <br />May 7, tad' <br />Pape a <br />J. Sac+ian 91. a.2„ Wane 2 !Isf of metals sren~~ <br />Thor standards Iis~Bd for arsef]F mertvey. and solarium in 71e C~PHE Regulation 36 itN Rio <br />Grande StrEam Segment 26 are !or the total recovrrabk form of the metals, not total. <br />E'evated concentradans of aluminum have peen reptxtea in acme bacrsir4 wells,i.e., !ho BF- <br />serves wefts} anc seeps, aluminum should be Indud9Q in If1e Ott of parameters. <br />•, ~ea~fen til 3.2, p~na~1, lutnaraera h <br />3t:t;on RS•2, spsdtlcally the period of rsrard t-11-1990 threugn 7.20.1589, is not <br />!eaesentat;ve of bpekgrr:txid Hardness eandidons in the Rtro Seca. $taGon Rs2 is Iogtad <br />at:out 3,000 feet downstream of the West Plt and, a6 ouch, has been irfluencad by BMRt <br />m:rdny ectiona br the entire period of nerd uwd. In addNon. revww of the hardness data <br />icr ShtGon R&2 indicates a defirtlte Ynpact due to leakage from the Weat P!t dUrlr9 the pbriod <br />1985 and 1899. The six hardness ~ratues repotted between Cacamber 2t, t999 and April 14, <br />1989 range from 141,4 tt7 17b.3 mglt_ as CeCD1. Ir,etuslon c} these 9brioucly ~mpacied data <br />fn :he trardrfeas calculation Is Inappropnate. <br />5ration RS•tshculd be used m provide reoreserttst:veleta for the Hardness evaluetlon. <br />Station RS-' or iocaled upstream of all BMRI dIMuR+anoea and has art P.xtenetve monitoring <br />record. We also reoamtnend that the RS-1 hardness dtttabese be rectal itx seasonality to <br />determine it Qre use of Seasonal hardness raltre5 is spproprlate, rather the using the median <br />value for au seasana. <br />S. Ssetlo» N1.B.1. flags 3 <br />Tne use Of 86v' percerttlb date for RS-6 is Inconsistent MAth the use of the'0" percentile dab <br />fOt RS1. Tht use of a IpY1Cr percentile for the upstream ioadinp allows for a Larger IuaginQ <br />ircm the eiseharge aoint(e). Thor iulme peranble Ioadlrp must be cansrdared for both the <br />upstream and downstream poinb. <br />Sla6ons RS2 and RS-5 acre located apprwdmatsb 3.000 het snd 9,000 teat dttwestream a} <br />the wear Pit; reapedwaiy. a oompaneon of foaling from smuom RSd and RS-5 mart be <br />provided SQ derrtonsltaW that station RS-6 k ale approprtab location to deterrttine basetlne <br />lgdings. we txllew that petuMtetal reaetians end addltlotnt;oadings in the mwo than one <br />mile between Stations tt5-2 end RS-5 make RS-Z a rttvre >tppropriate seleeyort ibr IMt <br />analysts, <br />A5 discussed In Comment 4, we also recommend that the metals data De tested for <br />seesonaNty to detemkte tf the use of 9easontU Cortcerttratlon values is ppprapriate, rather <br />than using the 50" a S6" percentile values for all Haw repirrtea, <br />0. Section ft1.8.2. was J <br />The permit provides no fnfortnat)on conoanrhg the talculatbn ofthe 1E3 end 30E Slow Aow <br />wives. SpecificalN. what staton were tMM values delved from? Wow many flow values <br />