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TABLE B-3 - HISTORICAL GROUNDWATER MONITORING AND ANALYTICAL DATA <br />DTW GWE Nitrate as N Nitrite as N I,2,3-TCP Triazines <br />(Atrazine, Simazi ne) Ammonia as N Total Kjeldahl <br />Nitrogen DBCP EDB OP <br />Pesticides <br />Detection Limits-i <br />Units-. <br />varies <br />mg/L <br />varies <br />mg/L <br />0.005 <br />p.g/L <br />0.20 <br />pg/L <br />varies <br />mg/L <br />varies <br />mg/L <br />0.0060 <br />rig/L <br />0.0050 <br />pg/L <br />varies <br />jtg/L <br />Well I.D. <br />TOC Elev. <br />MCL-. 10 10 c 0.005 0.3, 0.4 no limit no limit 0.2 0.05 varies <br />Date Feet Feet <br />B23/GW1 08/23/13 10.9 69.0 -- 0.13 0.441 <br />B22/GW2 08/23/13 9.1 15.9 0.10 ND <br />B2 I/GW3 08/23/13 5.85 219 0.34 ND <br />B25/GW4 08/23/13 dry at 16 -- <br />B27/GW5 08/23/13 dry at 12 -- <br />B28/GW6 05/02/16 11 to 15 5.4 <0.1 3.3 <br />B29/GW7 05/02/16 11 to 15 1.2 -- 0.11 9.2 <br />B30/GW8 05/02/16 11 to 15 <0.1 -- 0.29 8.3 <br />B31/GW9 05/02/16 11 to 15 0.23 -- 0.32 7.0 - <br />B32/GW10 05/03/16 11 to 15 47 - 0.33 7.5 <br />B35/GW11 05/03/16 11 to 15 48 - 0.56 2.4 -- <br />B39/GW12 05/03/16 11 to 15 150 -- 12 -- 0.62 4.4 <0.0060 <0.0050 ND <br />B41/GW13 05/04/16 31 to 35 0.28 0.69 8.1 -- <br />MW-I <br />4.65 <br />05 16 16 5.89 -1.24 140 <0.00017 0,11 2.9 <0.0060 - 0.0050 ND <br />0607/17 6.21 -1.56 220 0 19 <0.0050 <0.20 - -- <br />09/29/17 7.90 -3.25 240 0 25 <0.0050 - - -- <br />12/21/17 8.10 -3.45 230 0.21 <0.0050 -- -- <br />NIW-2 <br />4 39 <br />05/16/16 5.41 -1.02 210 -- . 0.1 0.75 <br />06/27/17 5.54 -1.15 270 0.045 1 <0.0050 <0.20 -- - <br />09/2 9 /1 7 7.60 -3.21 240 0.082 <0.0050 -- -- . <br />12/21/17 8.11 -3.72 260 0.049 J <0.0050 - __ __ __ <br />\1W-3 <br />3.84 <br />05/16/16 4.64 -0.80 66 - 0.0057 0.14 0.70 <0.0060 <0.0050 ND <br />06/27/17 5.10 -1.26 95 0.029 1 0.0022 J <0.20 - -- - <br />09/29/17 7.78 -3.94 74 0.059 0.0038 J -- -- - - -- <br />12/21/17 7.80 -3.96 61 0.047 1 0.010 - _ .. <br />DTW = depth to water (feet) <br />GWE = groundwater elevation (feet) <br />1,2,3-TCP = 1,2,3-Trichloropropane <br />DBCP = Dibromochloropropane <br />EDB = Ethylene Dibromide <br />OP Pesticides = Organophosphorus Pesticides <br />MCL = California Maximum Contaminent Level for drinking water <br />TOC Elev. = Top of casing elevation, in feet, referenced to NAVD88 vertical datum <br />= Not Analyzed <br /><= Not detected above the indicated Practical Quantitation Limit (PQL) <br />ND = None detected above the respective laboratory reporting limit <br />c = Combined limit for Nitrate + Nitrite as N <br />= Estimated Value (Contract Laboratory Program [CLP] Flag) <br />Bold indicates that value is above the MCL <br />KTrojeet \6000_prj16847 Raymond Investments - Helena ChemicaWata\20170801-6847 historical.xlsx