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(g) The subdividing of the land shall be such as to provide~ by means of a public street, each lot with satis- factory access to an existing street. (h) Minim~mm width of residential lots shall be 50 feet measured at the building setback line except for to%m- house developments. {i) Minimum average depth of residential lots shall be lOO-feet. ARTICLE IV. Required Improvements. Section 32-20. ~.[onuments. Monuments shall be placed at all block corners and at the tangent point of curves connect-ing intersecting street lines, at the points of cuEvature and tangency in curved street lines, and .at all corners in the exterior boundary of the sub- division and at such other points as may be designated by ~ae City Engineer. ~onuments shall be set flush with the surface of the ground Or finished grade, visible upon final acceptance inspection, and shall be either: {a) Pre-cast concrete, square or 8 inches in diameter, therein; or 30 inches in length, 6 inches with a metal pin imbedded (b) A steel or iron pin,-6/8 of an inch in diameter, set in poured concrete, at least 18 inches deep and 10 inches square. Section 32-21. Utility and street Improvements. In subdivisions, or parts of subdivisions, situated within the city, improvements shall be provided as follows: (a) Streets shall be graded to the full width and in conformance to the approved cross sections and profiles and shall be surfaced as set forth below. (b) The pavement base and surface of streets, shall be appropriate to the type of development and t~e of use con- templated and shall be installed in accordance with standards and specifications of the City of Portsmouth. The thickness of base and pavement shall be determined by actual soil bear- ing tests of the California Bearing Ratio type or equal (per- formed at the expense of the subdivider by an approved testing laboratory at locations specified by the city engineer], and by anticipated traffic loading methods as developed by The -16-