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peter Moleux, P. E. & Associas,�
<br /> Environmental and Safety Consultants & Eft&ineers
<br /> 44 Wheeler Road
<br /> Newton Centre, MA 02159-2656 U.S.A.
<br /> Tel.#1 (617) 965 4920 Fax. # 1 (617) 964 5072
<br /> February 4, 1994
<br /> CONTAINMENT CERTIFICATION FOR LIKA CORPORATION,STOCKTON,CA
<br /> I,Peter Moleux,have visually inspected the containment area surrounding the wastewater
<br /> collection and treatment tanks at Lika Corporation located at 1443 Navy Drive in Stockton,California.
<br /> My inspection took place on Friday,February 4, 1994. The entire containment area,7,000 square feet,is
<br /> ander a roof. The contained area includes one,above ground,lined concrete containment area and one,
<br /> below ground,pit(12 feet deep by 14 foot wide by 40 feet long)housing nine(9)tanks,during the time of
<br /> shr inspection(two were not used and were empty).
<br /> Within the 7,000 square foot contained area is a 13,400 gallon capacity above ground
<br /> u3tainanent wall surrounding two 6,500 gallon'storage tanks. One tank is dedicated to receiving fresh
<br /> <.aline(mostly ammonium hydroxide)etchant for use within the printed circuit fabrication facility and
<br /> the second tank is used to store spent etchant containing copper before it is removed offsite for recycle.
<br /> The concrete block walls and concrete floor surrounding these tanks have been coated with a suitable
<br /> coating to protect the concrete. The walls and floor appeared,during my inspection,to be in good
<br /> I(Aidition. The floor space in this contained area is 360 square feet. The 24 hour,25 year,maximum
<br /> ,toren is reported to be 3.01 inches or about 1.9 (1.876)gallons per square foot. The potential rainfall
<br /> ^ntering this area is 684 gallons(assuming damage to the roof). This contained area meets the
<br /> c �airements of section CCR 22-66264.175.
<br /> Both the 1,500 gallon concentrated(93%)sulfuric acid and the 6,500 gallon 50%caustic soda
<br /> (sodium hydroxide)tanks have individual secondary containment tanks surrounding each of them. They
<br /> too are located within the 7,000 square foot area. These high density cross linked polyethylene tanks were
<br /> in.good condition.
<br /> The floor and 8 inch high berm surrounding three sides of the 7,000 square foot containment are
<br /> epoxy coated. There are four(4)areas that will be improved by an outside contractor no later than March
<br /> 1, 1994. These include the walls and floor of the pit,the floor adjacent to the sulfuric acid tanks,the floor
<br /> adjacent to the deionization tanks,and adjacent to the final pH adjustment tanks. Except for five or six
<br /> small cracks in the containment wall,the wall appears in good condition. The fourth side of the
<br /> containment area is the wall of their building. A metal fence surrounds this 7,000 square foot area.
<br /> The combined volume of all tanks possibly containing hazardous waste within the 7,000 square
<br /> foot area(including the sulfuric,caustic,spent etchant&fresh etchant tanks mentioned above)is about
<br /> 72,000 gallons. The containment volume of the pit,without any tanks,is 50,272 gallons.With the 8 inch
<br /> depth,the contained volume,without any tanks,is 34,500 gallons. The combined volume of containment
<br /> associated with the pit and with the main contained area is(50,272+34,500) 84,772 gallons. This
<br /> volume is significantly more than the sum of the potential rainfall(1.9 gallons/square foot*7,000 square
<br /> feet), 14,000 gallons,plus the largest tank containing hazardous waste(either 6,500 gallons,or the 11,000
<br /> gallons of non hazardous water which is produced from the deionization tanks in the contained area).
<br /> The available containment volume(84,772 gallons)is also larger than the sum of the potential rainfall,
<br /> 14,000 gallons,plus 10%of the aggregate volume of tanks possibly containing hazardous wastes(7,200
<br /> gallons).
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