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� <br />SMITH AUTO SHOP <br />N.B. JOB # 91133C <br />IV. BAFFLE TYPE OIL/WATER SEPARATOR (IN LIEU OF BIOFILTRATION <br />SWALE). <br />A.1 CALCULATE THE DZSCHARGE FRGM THE RESTRICTOR M.H. WITH AN <br />ORIFICE OF 3 13/16 INCHES IN DIAMETER AND AT A HEAD OF <br />670.5. <br />4= CA (2gh)1/2 <br />C= .62: A(3-13 16)2(TT) = 0.0793 sf <br />4 <br />H= 670.5 - 667.5 = 3 FEET <br />THEN: Q = .62(0.0793)[(2(32.2)3)]l�z = 0.683 CFS <br />A.2 PROVZDE RETENTION TIME FOR 15 MIN <br />0.683 FT3/SEC X 60 SED/1 MIN X 15 MIN = 615 FT3 <br />615 CF X 7.4805/CF GAL = 4600 GAL <br />B.1 COMPARE USING I=.5 IN/HR FROM 4.11, C= <br />THEN <br />Q = CIA = (.9)(.5)1.15 = 0.517 CFS <br />B.2 PROVIDE RETENTION TIME FOR 15 MINUTES <br />C. <br />END. <br />9, A = 1.15 AC <br />0.517 CF/SEC X 60 SEC/MIN X 15 MIN = 465.75 CF <br />465.75 CF X 7.4805 GAL/CF = 3480 GALLONS USE 3500 <br />GALLONS. <br />USE THE LESSER VALVE OF 3500 GALLONS SINCE THIS IS WITHIN <br />GUIDELINES OF THE DESIGN AND CONSTRUCTION STANDARDS <br />MANUAL AS PER CHAPTER 4.11 FOR OIL/WATER SEPARATION <br />DESIGN. THE LARGSR VALUE OF 4600 GALLONS IS BASED ON 100 <br />YEAR DESIGN CRITERIA. <br />REQUIRES A BAFFLE TYPE 0/W SEPARATOR WITH A CAPACITY OF <br />3500 GALLONS. <br />FROM PIPE CATALOG, SELGCT A CLARIFIER MOD�L NO 712-5 WITH <br />628 GALI�ONS CAPACITY PER VERTICAL FOOT. <br />n• <br />�i <br />1,�:; `'�; ! <br />` �t`� i, ' .,, <br />•„ � <br />\� �:I�-� li�� , �,�. <br />i' <br />