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,��tD � Mr Michael Infurna April 30, 2004 Page 4 cn U �1VCES~� Following the initial months of operation with the ICE unit, granular-activated carbon (GAC) vessels will be delivered to the site and utilized for the treatment of vapor emissions from the SVE equipment Two 1,000-1b GAC vessels will be mounted in series The second unit will provide back-up in case of breakthrough on the initial vessel Upon breakthrough, the second vessel shall become the first vessel and a new GAC vessel will be delivered to the site to act as the second vessel Carbon change-outs will be accomplished at the site on an as-needed basis A flexible air hose connects the air sparge wells at the distribution header to the ICE unit air compressor The infection air is routed through an oil filter prior to infection into the sparge wells Compressed air for the AS System is supplied by an oilless rotary vane air compressor The compressor is powered by the ICE unit and has a capacity in excess of 21 scfm at a delivery pressure of approximately 7 psig A bleed valve will protect the compressor from excessive pressure during operations For long term operations, compressed air for the AS System will be supplied by an oilless rotary vane air compressor (C-101) The compressor will be powered by a totally-enclosed fan-cooled (TEFL) motor and have a capacity in excess of 21 scfm at a delivery pressure of approximately 7 psrg A bleed valve will protect C-101 from excessive pressure during operations The outlet of the compressor will be equipped with an aftercooler unit (AC-101) so that excessive heat will not damage the flow and pressure control equipment for the system An inlet particulate filter will protect C-101 from dust and other particulars in the ambient airstream All AS equipment will be mounted, along with the SVE equipment, on a pre-plumbed and pre-wired steel skid A 500-gallon steel above ground liquefied propane tank, set inside the remediation compound, is used to supply supplemental fuel to the ICE unit Concrete crash barriers were set outside the remediation compound to protect the propane tank from vehicular traffic The remediation system equipment is housed in the Remediation Equipment Compound The compound consists of a 12-ft by 22-ft pad constructed utilizing 6 inches of reinforced concrete The compound is enclosed by a 6-foot high chain-link fence The compound is accessible via one walk-in gate (-4 feet across) and one double-gate (-12 feet across) for maintenance of mayor components, as necessary A diagram showing the remediation system piping layout and compound is included as Figure 2 Waste Disposal Drill cuttings and excavated soil from the remediation system trenches was stockpiled on plastic sheeting during the system installation Four grab samples (STK 1 —4) were collected from the stockpile for TPH(g), BTEX, and total lead analyses The samples were delivered under chain- of-custody document to Columbia Analytical Services, Inc in Canoga Park, California