If he deems it necessary, the City Engineer shall thereafter prepare specifications and plans of the work to be done and the manner in which and time within which the work is to be done. Such specifications shall include but not be limited to size and type of pipe, sewer or drain required; precise location and grade of the line; joint and jointing material; number, location and type of manholes, if any; grade, course and depth of the line; means or methods of excavation; point or points of connection with the sewer system of the City; such bracing, shoring and sheeting as may be required; such underdrains as may be required; manner of removal of rock; protection against subsurface water; protection of the public and of property; removal and replacement of excavated material and of pavements, curbs and sidewalks; and such other details with reference to the construction as the City Engineer shall deem customary, desirable and proper for adequate and well-drawn specifications for the character of work to be done. Such specifications shall, so far as is practicable, be in accordance with existing standards of the City for such work or with standards to be reduced to writing by the City Engineer and approved by the Council; subject, however, without restriction or limitation, as to any change or variance from such standards and the imposition of additional requirements where, under the circumstances of any particular case, the City Engineer deems it advisable. A copy or copies of such specifications when so prepared shall be furnished to the applicant upon request.