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JM Equipment Chemical Oxidation Test Report 2.3 Ozone injections Ozone injection events were conducted during the last two treatment events The ozone was ' injected at 8 wt percent with oxygen and 15 standard liters per minute (slip) for two hours The dose rate was 1 6 grams/ruin of ozone At the end of the two hours, the ozone was shut off and the oxygen flow rate was increased to 25 standard liters per minute (slrn) to purge the well The well was then allowed to rest for an hour and was sampled A hydrogen peroxide injection event ' then followed the sampling 2.4 Sampling ' Before each injection, the wells were sampled Prior to obtaining the samples, each well was pumped to remove three well casings of volume of groundwater The samples taken were volatile organic compounds (VOCs) by EPA Method 8260, oxidation reduction potential (ORP), pH, and temperature The dissolved oxygen (DO) was measure directly in well MW-9 before sampling, however, the monitoring points (GP-1, GP-2, and GP-3) were not large enough in diameter to insert the DO probe ' 3.0 RESULTS The goal of the test was to determine the effective destruction of petroleum hydrocarbons and the ' radius of influence of the injection Two weeks�.aa allotted between events to allow the oxidant to dissipate into the groundwater and for the groundwater to rebound following injection events Since both hydrogen peroxide and ozone give a positive reading(i a oxidizing), the groundwater ORP measurements were used to track the oxidants movement through the subsurface away from the well Since the natural background of the water is reducing (a negative ORP reading), any positive measurements would clearly be indicative of oxidant movement The water was also ' checked with hydrogen peroxide test strips with a minimum detection limit of 0 5 ppm ORP measurement tracking was conducted at each event before the injections The ORP data is ' shown below in Figure 1 Monitoring points GP-1 approached the same measurement of ORP in well MW-9 following the first injection Monitoring point GP-1 appeared to have a close connection to MW-9, as gas was observed exhausting from -monitoring point GP-1 when well MW-9 was pulsed with oxygen Monitoring point GP-2 exhibited a slight positive increase ' (more oxidizing) in ORP over the first five injections, followed by a large negative change on June 1 l which was also accompanied by a large organic increase After the June 11 event, the slight positive increase in ORP returned Monitoring point GP-3 did not show any significant ' trend of ORP change prior to the June 11, 2004 event, but did have an increasing ORF following June 11, 2004 1 1 Applied Process Technology,Inc Confidential Information 09/20/04 APT SO 019 �vww aptwatei cane Page 5 of l l 1