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JM Equipment Chemical Oxidation Test Report ' 1.0 INTRODUCTION 1.1 Site Information The site is located at 1245 West Charter Way in Stockton, California A site release occurred in the 1980s from an underground storage tank containing gasoline ' The impacted area is approximately 160 feet by 150 feet Concentrations in excess of 20 milligrams per liter (mg/L) of total petroleum hydrocarbons as gasoline (TPHg) have been detected in the groundwater at the site Monitoring well MW-9 exhibits the highest hydrocarbon concentration(137 mg/L) and is located down-gradient to the source area (approximately 10 feet east) This is the highest concentration detected prior to chemical oxidation treatment ' The underlying site geology consists of clay with some inter-bedded layers of sand A groundwater sample taken up-gradient of the spill was measured with an oxidation reduction meter and was determined to be reducing Chemical oxidation field tests were conducted by Applied Process Technology, Inc (Applied)to assess the feasibility of the technology at the site for hydrocarbon destruction in the dissolved and adsorbed-phase The ozone and hydrogen peroxide system utilizes the hydroxyl radical ' (-OH), in addition to ozone and hydrogen peroxide individually, to break down organic contaminants into naturally-occumng compounds 1.2 Well information Monitoring well MW-9 was utilized as the infection well for the Chemical Oxidation test Well MW-9 is a two-inch diameter monitoring well, screened from 15 to 35 feet below ground surface ' (bgs) and is a total of 35 feet deep Three monitoring points (GP-1, GP-2, and GP-3) were installed with a geo probe at distances of 13 inches, 22 inches, and 45 inches northeast of well MW-9 The monitoring points are each 3/-inches in diameter and screened from 30 feet bgs to t20 feet bgs and are a total of 30 feet deep The mittal depth to water in well MW-9 (measured March19,2004) was 15 2 feet bgs and dropped to 16 1 feet bgs (0 9 feet drop in the water table) over the 15 week period of the test ' The infection well, MW-9, and monitoring points GP-1, GP-2, GP-3 were sampled on March 19, 2004, as shown in Table l below ' Table 1: Baseline Groundwater Sample Results Date Well Benzene( Toluene Ethyl- Xylene TPHg MTBE (P91L) (p9/L) benzene (P91L) {F IL) (P91L) (u91L) 3119/04 MW-3 25,400 9,210 3,640 14,000 137,000 NA ' 3/19/04 GP_l 27,200 12,600 4,180 18 700 139,000 NA 3/19104 GP-2 22,500 9,490 5,101 25,500 199,000 NA 3/19/04 GP-3 13,900 393 258 8,110 85,400 NA Apphod Proces9 Technology,Inc Confidential information 091201()4 Ar�r so-oi9 www �twxtef coitz Page 3 of t l