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13 July 2012 <br /> AGE-NC Project No.96-0236 <br /> Page 3 of 13 <br /> EPA method 826013; <br /> • Dissolved metals by EPA method 200.7; <br /> • Hexavalent Chromium by EPA method 218.6; <br /> • Anions by EPA method 300.1; <br /> • Ammonia as N by EPA method 350.1; <br /> • Total dissolved solids by EPA method SM250C. <br /> 3.2. HYDROGEN PEROXIDE SOLUTION PREPARATION AND INJECTION <br /> Between 28-30 March, 04-06 April, 11-13 April and 18-20 April 2012, a total of sixteen (16) <br /> batches of a 5% solution of hydrogen peroxide were prepared on-site for ISCO injections. <br /> Each batch was prepared by mixing the following ratio into a 200-gallon poly tank: (1) 160 <br /> gallons of potable water from an on-site source, (2) approximately 25-27 gallons of 35% <br /> industrial grade hydrogen peroxide, and (3) 1.25 gallons of muriatic acid. Once the <br /> hydrogen peroxide solution was mixed (modified Fenton's Reagent), each batch was <br /> gravity fed from separate 200-gallon poly tanks and into wells DPE-1 and DPE-2 utilizing <br /> vinyl tubing. <br /> During each injection event (i.e. total of 4 batches), one tank of the hydrogen peroxide <br /> mixture (equaling approximately 200-gallons) was injected into DPE-1 and three tanks <br /> (equaling approximately 600-gallons)were injected into DPE-2 over a period of three days. <br /> 3.3. POST-ISCO INJECTION MONITORING EVENTS <br /> Additionally,four post-ISCO injection monitoring events were conducted on 25 April (Post- <br /> ISCO Event No. 1), 02 May(Post-ISCO Event No. 2), 09 May(Post-ISCO Event No. 3)and <br /> 16 May 2012 (Post-ISCO Event No. 4) utilizing wells MW-1 A, MW-2, MW-4, DPE-1 and <br /> DPE-2 to determine the effectiveness of the pilot study injections. Field parameters pH, <br /> dissolved oxygen (DO), oxygen reduction potential (ORP), salinity, total dissolved solids <br /> (TDS),temperature and electronic conductivity(EC)were collected from each well utilizing <br /> a YS1556i multi-meter probe. The probe was placed down-hole into the water column until <br /> readings were stabilized. <br /> In addition to in well parameter collection, ground water samples were collected in <br /> accordance with AGE's standard monitoring procedure from each of the above wells. <br /> Advanced GeoEnvironmenlal,Inc. <br />