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. 3.0 SOIL REMEDIATION 1 3.1 On-Site Remedial Treatment Impacted soil removed from the north and south pits required remedial treatment prior to disposal. The following sections describe the activities conducted to accomplish soil remediation. 3.11 Treatment Pile Construction and System Installation MARK implemented a hybrid combination of Heat Enhanced Vapor Extraction and Thermal Oxidation (HEVEITO), augmented with bioremediation, to remove and destruct petroleum hydrocarbons in the approximately 1,000 cy bulk volume of impacted soil removed from the north and south pits The HEVEITO soil treatment pile was constructed on top of industrial 6-mil plastic Ssheeting After placing approximately 6-inches of soil on the plastic sheeting, one row of 3/4- inch internal diameter slotted galvanized steel air injection pipe was installed The pipe was covered with approximately 3 feet of loose soil and then a row of 3-inch internal diameter slotted polyvinyl chloride (PVC) air extraction pipe was laid Additional soil was then loosely placed on the pile and a second row PVC extraction pipe was laid at about 6 feet above the steel air infection lines All piping rows were placed horizontally at 6 foot centers and staggered from the row immediately below. Unslotted pipe sections were used to extend through the slope face of the pile so that a 2 to 3 foot soil seal was provided on the outside edge of the pile Upon completion of treatment pile construction, the pile was covered with industrial 6-mil plastic sheeting. Necessary utilities were extended to the remediation area and the trailer-mounted HEVEfrO was hooked-up Drawing 3-1 illustrates the treatment pile construction design FASCLOSE 3 3-1 92-1177102 36