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CONDOR EARTH TECHNOLOGIES INC 188 Frank West Circle Suite I Stockton CA 95206 Phone 209.234.0518 o FAX 209.234.0538 CONDOR www.condorearth.com June 7,2004 Ahmed Kamal Silicon Turnkey Solutions 400 Industrial Park Drive Manteca,CA 95337 Subject: Treatment Tank Certification Condor Project No.4446 ` Dear Mr. Kamal: This letter certifies that the treatment tanks located south of the Silicon Turnkey Solutions facility in Manteca are within secondary containment sufficient to contain 100%of the largest tank capacity plus the precipitation from a 25-year 24-hour rainfall event. The tanks appear suitably designed for their intended use in size and material as a result of visual observations. No evidence of tank leaks,overflows, or significant corrosion were noted. The coated steel and plastic tanks were replaced in 1998. An inspection of the tanks on June 3,2004, indicated that the tanks were maintaining structural integrity with no observed visible leaks. Some limited rusting was observed,but this appeared to be limited to minor exterior corrosion. This rusting did not appear to be threatening the structural integrity of the tanks. The secondary containment is lined and painted concrete. The secondary containment horizontal surfaces was coated with non-skid epoxy when the tanks were replaced that is intended to be corrosion resistant. The vertical surfaces of the secondary containment are painted. There was no visible evidence of exposed cracks in the secondary containment. The volume of the largest tank(clarifier)was calculated to be approximately 5,087 gallons. Precipitation from a 25-year,24-hour rainfall event falling directly onto the exposed secondary containment area totals approximately 1,449 gallons. The total secondary containment comprises approximately 8,925 gallons. Consequently,the secondary containment is capable of handing 100%of the largest tank and the 25-year 24-hour rainfall with an additional available capacity in the secondary containment of approximately 2,389 gallons. The leak detection system for the tanks is visual observation. The tanks are supported on stands or I- beams and full under-tank visibility is afforded for some tanks while any released material would be visible running out from under the other tanks. No foundation failure of the slab was visually evident. The tanks have been bolted to the slab. This evaluation did not include seismic calculations. No underground piping is included in this certification, however the following description is provided. There are four potential source of material that can enter the treatment system. Acid waste from a plating