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11 March 2014 <br />AGE Project No. 96-0236 <br />Page 27 of 32 <br />injection wells. Soil borings will be advanced using a truck-mounted drill rig equipped <br />with 8.25-inch hollow-stem augers. The total depth of each well boring may vary <br />according to geologic/hydrogeologic conditions encountered during drilling. Soil <br />samples will be collected from selected pilot borings at selected depths. Injection well <br />locations are as follows: <br />Five shallow and three intermediate wells are proposed to be advanced within <br />the facility building in areas of significant adsorbed and dissolved hydrocarbon <br />impact; <br />One intermediate well will be advanced adjacent to DPE-1 to facilitate <br />remediation of the intermediate soils and groundwater near the former tank pit; <br />One shallow and one intermediate well will be advanced west of the MW-9/17/18 <br />well cluster to remediate downgradient adsorbed and dissolved hydrocarbon <br />impact; <br />Two shallow and one intermediate well will be advanced north of MW-4 behind <br />the site building to remediate downgradient hydrocarbon impact to soil and <br />groundwater; and <br />Two shallow and one intermediate well will be advanced east and northeast of <br />the MW-4/15/16 well cluster to remediate the downgradient source area of the <br />adsorbed and dissolved hydrocarbon plume. <br />The proposed injection well (shallow and intermediate) locations are illustrated in <br />Figure 20. <br />Selected soil samples will be analyzed to complete any data gaps or where unknown <br />degradation of concentration are suspected from past pilot testing, utilizing a State of <br />California Department of Public Health (CDPH)-certified laboratory for the following <br />constituents: <br />Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and <br />TPH-d) in accordance with EPA Method 8015M; and <br />Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and fuel additives <br />methyl tertiary-butyl ether (MTBE), tertiary-butyl alcohol (TBA), di-isopropyl ether <br />(DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), 1,2- <br />dibronnoethane (EDB), and 1,2-dichloroethane (1,2-DCA) in accordance with <br />EPA Method 8260B. <br />Laboratory reports of soil analysis, testing methods, laboratory quality assurance/quality <br />control (QA/QC) reports, and sample chain of custody documentation will be presented <br />in a report of findings and recommendations. <br />.4dvanced GeoEnvironmental, Inc.