_PERMIT FILE - M2000002 (15) - Laserfiche WebLink

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Potential Contaminant Concentrations in Proposed Tanabe Pit Dewatering Flows Constituent Dewatering CBSG MCL Health Aquatic PQL Flow L /L L L L Diisopropylmethyl phosphonate 4.8 8 NA 8 NA - - - DIMP t Halo enated Or anics 1,1-Dichloroethane 11DCLE 0.11 0.4 5.0 0.4 118,000 1.0 Cis-1,2-Dichloroethene 0.07 70 70 70 NA --- C 12DCE Chloroform CHCL3 0.10 6 NA NA 28,900 - - - Meth lene Chloride CH2CL2 0.48 5 5 5 NA - - - Tetrachloroethene TCLEE 0.36 5 5 5 5,280 - - - l,l,l-Trichloroethane Il1TCE 0.20 200 200 200 NA --- Trichloroethene TRCLE 0.05 5 5 5 45,000 - - - Based on average plume concentration of 24 Ng/I. and 20% of total dewatering Flow ' Colorado Basic Standards for Ground Water, effective March 2, 1999 ' Colorado Primary Drinking Water Standards, effective January 30, 1999 ° Colorado Basic Standards and Methodologies for Surface Water, Human Health Based Water Supply Standard, effective March 2, 1999. ' Colorado Basic Standards and Methodologies for Surface Water, Aquatic Life Based Acute Standard, effective March 2, 1999. ° Practical Quantitation Limit, presented only when the PQL is greater than the CSRG or applicable standard. PQLs taken from CBSG. 'Based on average concentrations from wells 995A and 1189A (see Attachment L) and 9% of total dewatering Flow NA=Not Available