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Treadwell&Wlo <br /> Attachment 4 A LANSAN COMPANY <br /> Natural Attenuation Parameters <br /> 423 N Madison Street <br /> Stockton, California <br /> Nitrate as Dissolved ORP <br /> Location Date Iron Nitrogen Sulfate Oxygen (mV) <br /> MW-1 01/12/00 , < 0.050 3.2 96 2.47 177 <br /> MW-13 .01/12/00 < 0.050 < 1.0 23 0.78 47.3 <br /> MW-18 01/12/00 < 0.050 1.4 76 1.77 194.5 <br /> MW-21A 01/12/00 11 < 1.0 < 1.0 0.66 -78 <br /> MW-21B 01/12/00 < 0.050 < 1.0 90 1.48 101.3 <br /> MW-25 01/12/00 < 0.050 < 1.0 89 0.8 -172.3 . <br /> Notes <br /> All results in milligrams per liter(mg/L)except for ORP which is in millivolts <br /> ORP-oxygen-reduction potental <br /> Sources: <br /> State Water Resources Control Board Geotracker Database,accessed May 2013. - <br /> http://geotracker.waterboards.ca.gov/profile_report.asp?cmd=mwreport&global_id=T06077000811&con_n u m=3159089744 <br /> Advanced GeoEnviron mental, Inc. 13 January 2004 Monitoring Well Sampling Field Logs <br /> (part of Attachment 3 of this closure report) <br /> 731589001 Page 1 of 1 May 201'3 <br />