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5.0 GROUND WATER TREATMENT Ground water contaminated with gasoline range hydrocarbons is found beneath the site at approximately the 40 .0 to 45.0 foot depth. Initial recovery/treatment of this ground water will be from monitor wells MW1 and MW3 at a combined pump rate of 2000 gallons a day during the initial start up of the treatment system. The pumping will be accomplished using down hole air-het pumps (gasoline rated) to recover and transport ground water to a sealed sediment collection tank (vented to the incinerator) and then into the 1000 gallon "ConVault" that will be converted into a air stripper tank for the start up test of the system. If the air stripper tank proves unsuccessful in reducing the levels in the treated ground water for discharge to sewer then for polishing, activated charcoal tub scrubs will be used ( 2 55 gallon in series) . Compounds sewer discharge levels NOT TO EXCEED TOTAL PETROLEUM HYDROCARBONS 100 MG/L TOTAL TOXIC ORGANICS 4.57 MG/L VOLATILE HYDROCARBONS 0.25 MG/L (TPH-BTEX) VOLATILE AROMATIC HYDROCARBONS 100 MG/L (BTEX) TOTAL FREE PRODUCT NONE LOWER EXPLOSION LIMIT (LEL%) 20% ALARM 40% SHUT DOWN RAINFALL EXCEEDS 1/2"/HOUR SYSTEM SHUT DOWN The start up of the incinerator will be provided by "Hirtz" . "Hirtz" is also in the process of obtaining the permits needed to construct and operate the incinerator from San Joaquin County Air Quality. Ground water recovery-treatment ::ill not com.m.ence until all necessary permits are approved. Once the contaminated ground water is processed through the stripper it will be placed into a 15,000 gallon "Baker" tank for sampling prior to dumping to the sewer ; the permit for sewer disposal is being processed, and disposal of the treated ground water to the sewer will not begin until the permit has been approved, see Figure 7-Schematic Ground Water Recovery and Treatment. • 9