(a) A Preliminary Soil Report, prepared by a soils engineer or a registered engineering geologist, and based upon test borings and excavations done at the subdivision site, shall contain the following elements:
(1) The specific geologic and soil conditions within and immediately adjacent to the subdivision;
(2) Indication and delineation of critically expansive soils or other soil problems which, if not corrected, may lead to defects in structures, buildings and other improvements;
(3) Report on the suitability of the earth material for the construction of stable embankments and excavation slopes, together with recommended construction procedures needed to obtain the required stability; and
(4) Report on slides, springs and seepage conditions, faults and erosion problems, together with recommendations for correction of any problems or hazards presented by such conditions.