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. . -., ~ .....,.. e . Ordinance No. 912 , P~ge 11 SECTION SIX. CONTROL OF ADMISSIBLE WASTES (a). Permit within 120 days after passage of this Ordinance, any person desiring to deposit or discha!ge any indus- trial waste mixture into the sewers or sewer works of the City, or any sewer connected therewith, or who is now so doing, shall make application to the Approvi~g Authority for a permit therefor upon application forms to be obtained from him. (b). Control Chambers - Within six months from the date of pass~ge of this Ordinance any person discha!gi~g or desir- i~g to discha!ge an industrial waste mixture into the sewers or sewer works of the City, or any sewer connected therewith, shall provide and maintain in a suitable accessible position on his premises, or such premises occupied by him, an inspection chamber or manhole near the outlet of each sewer, drain, pipe, channel, or connection which communicates with any sewer or sewer works of the City or any sewer connected therewith. Each such manhole or inspec- tion chamber shall be of such des~gn and construction which will prevent infiltration by, ground and surface waters or introduction of sl~gs of solids by installation of screens with maximum openi~gs of one inch but of such sufficient fineness to prevent the entrance of objectionable sl~gs of solids to the sanitary sew~ge system and shall be so maintained by persons discha!gi~g wastes so that any authorized representative or employee of the City may readily and safely measure the volume and obtain samples of the flow at all times. Plans for the construction of control manholes or inspec- tion chambers, includi~g such flow measuri~g devices as mayor may not be required, shall be approved by the Approvi~g Authority prior to the b~ginni~g of construction. (c). Measurement of Flow - The water consumption duri~g the previous month, as determined from the meter records of the 'Water Department, shall be the valid basis for computi~g the cha!ge for sew~ge flow, unless actual sew~ge flow is measured by a recordi~g meter of a type approved by the Approvi~g Authority. The persons shall install and maintain such device in proper con- dition to accurately measure such flow. Upon failure to do so,