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+•. t)RMNANCE No. 3158 P2.g8 8 liquid wastes containing grease i.n excassive amoun.ts., or anV i.nflammable wastes, sarbds and other harmful ingredients; except that such interceptors shall not be requirea for private living quartera or dvelling units. All interceptors sha12 be of a type and capacity approved by the Servi.ce Director., and shall be located as to be readily and easzlg accessible for cleaning and i.nspection. Grease and oil interceptors shall be constructed of impervious materials cspable of ? withstarbding abrupt and extreme changes in temperature. They shall be of substantial constractions watertight.. and equipped with easi7,y removabl.e covers which when bo2ted in place shall be gas ti#ht andmter tight. Where installed., al.l grease, fli.l and sand 3ntexceptors sha1Z be maintained by the owner, at his expensey in continuously efficient vperation at all times. Section 21: PRELLMSNARY TREAT*4ENT QF INDUSTRIA.L WASTES. The aclanission into the nublic sewers of any waters or wastes having (a) a 5-day Bioehetaieal O-Vgen Uemand grester than 300 pax'ts per mill.ion by weights or (b) containing more tnan 350 parts per million by we3ght of suepended soli.ds, or (c) containing any quantity of substances having the charactaristics described in Section 19, or (d) having an average daily flow greater than 2% of the average dai],y sswage flow of the City., shall be sub- ject to the review and approval af the Service Directar. Where necessary in the opinion of the Servica Director, the owner sha11 provide at hi.s expense., such preliminary treatment as nay be necessary to, (a) reduce the Biochemical Ox,ygen Aemand to 300 parts per miZlion and the suspand,ed solids to 350 parts per mi.llion by waight, wr (b) redUCe abjectionabls aharacteristies or constitubrttss to within the maximum 1im3.ts pravided for in Section 19s or (c) control the quantities and rateg af discharge of such waters or wastes. Plans, spec3.f'icati4ne., and any other pertinent information reIating to pro- posed treatanent faei].ities s ha11 be subnLitted fbr/6he approval of the Service Director, and no construction of such facilitie$ shal.l be corrmenced until said approval 3.s obtained in writing. Section 22: PRIVATE PRE TREATMENT FACILITIES; EXPENSE dF 4PFR.A'TIQN. Where any private pre-treatment facilit3.es ars provided for any waters or wastess tYiey shall be maintained conti.nnon.s3,y in satisfactory and effective operation., by the awner of auch treatment facilities at his expense. Section 23: INDUSTRIAL EASTES; MANHQLEESA The owner of any property° served by a building sewer carrying industri al wastes sha1.1 install a suitable cGntrol msn- hole in the building sewer to facilitate observations sampling and measurement of the wastes. Such manhole, shall be accessibly and safely locatred and sha1.1 be constructed in accordance w3.th plans approved by* the Service Director. The manhoZs shall be in- stullsd by the ownsr at his expense., and shall be riaintained by him so as to be safe and accessible at all times. Section 24s INDUSTKIAL 14ASTES; analyses of the characteristics of waters Sections 19 and 21 sYiall be determined in bcamination of Water and Sewages" upon the marhole provided for in Section 23 or upo ? mar?hole. TESTS, All maasuremants, tests, a nd and wastes to which reference is made in accordaace with '?Star?dard :'?teethods for the waste discharging through the control n suitable sanples taken at said control