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13 September 2012 AGE-NC Project No.99-0682 Page 2 of 17 • On 24 April 2012: Background/baseline groundwater monitoring event; • Between 29 May through 31 May 2012, ISCO injection Event No. 1 was conducted at the site; • Between 04 through 06 June 2012, ISCO injection Event No. 2 was conducted at the site; • On 07 June 2012, the first of two progress ISCO injection groundwater monitoring events were conducted at the site; • Between 13 and 15 June 2012, ISCO injection Event No. 3 was conducted at the site; • Between 18 June and 20 June 2012, ISCO injection Event No. 4 was conducted at the site; • On 21 June 2012, the second of two progress ISCO injection groundwater monitoring events were conducted at the site; • 28 June 2012: post-ISCO injection groundwater monitoring event No. 1; • 05 July 2012: post-ISCO injection groundwater monitoring event No. 2; • 12 July 2012: post-ISCO injection groundwater monitoring event No. 3; and • 19 July 2012: post-ISCO injection groundwater monitoring event No. 4. Each of the above activities are described below. 3.1. HYDROGEN PEROXIDE SOLUTION PREPARATION AND INJECTION Between 29-31 May, 04-06 June, 13-15 June and 18-20 June 2012, a total of twelve (12) batches of a 5% solution of hydrogen peroxide were prepared on-site for ISCO injections. Each batch was prepared by mixing the following ratio into a 200-gallon poly tank: (1) 175 gallons of potable water from an on-site source and (2) approximately 25-27 gallons of 35% industrial grade hydrogen peroxide; during ISCO injection event No. 1 and 3, one gallon of muriatic acid was added to each batch of the hydrogen peroxide solutions prepared at the site. Once the hydrogen peroxide solution was mixed, each batch was gravity fed (weeks 1 and 2)or pressure injected (weeks 3 and 4)from separate 200-gallon poly tanks and into wells MW-1A and MW-8 utilizing vinyl tubing. The following is a summary of the procedures for each injection event: Advanced GeoEnvironmen[al,Inc.