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<br />I' PITTSBURG TANK & TOWER CO" INC. City of Arden Hills, MN <br />I 1,000,000 Gallon Hydropillar <br /> <br />S'NC~ ,.,g <br /> <br />.. <br />I '~..~ <br />I .; - ~ .... <P'". <br />,........ ~=~.;:c:-_ <br />.... -. ..... "'''. <br /> <br />I v ...~..""".~.........'.,.."....).... .' '.. <br />I ' -~', <br />11 ""';.".,;..,....~ <br />I ; ~ <br /> <br />I <br /> <br />Ie Photo #12 - Shows the condnion of the existing roof manways and access tube opening. <br />We recommend to install Confined Space Entry Signs at each ofthe roof openings as <br />required by OSHA Section 1910.46. <br /> <br />I <br />I <br /> <br />....._i~' <br />" --'''-~-{:_- _ r~:~--. .... <br />I --~~'. 1f,iJ.'$'!. . <br />, _... <br /> <br />I ...~.. "-. "/~. <br />. . - - <br /> <br />..,............}i ~ <br />I .~_. <br />I ~ '. . <br />,! l''I. <br />~ \oS <br />I Photo #13 - The arrow is pointing to the roof vent. An improperly vented tank <br />may cause external pressure to act on the tank that can cause buckling even <br />at low pressure differential. We recommend to install an EPA approved. vacuum <br />.. pressure, frost proof vent and screen as required by' AWWA D1 00-84 Section 7.7, <br />OSHA Section 1910.106 and NFPA-22 Section 2-6.1. <br /> <br />8 <br /> <br />I <br />