Site Soil & Survey Report

Today we recieved the results from our site Soil & Survey reports!

 Our site classification is: "P"

Which it says means that we will have a 'Slab Freeboard of 150mm', with a 'Stiffened Raft' footing system that are piered/piled through in the natural B Horizon Clay. We will also apparently have a waffle raft on the piers.

Site classifications and movement based on soil reactivity
Class A (0-10mm)	Stable, non-reactive. Most sand and rock sites. Little or no ground movement likely as a result of moisture changes.
Class S (10-20mm)	Slightly reactive clay sites. May experience slight ground movement as a result of moisture changes.
Class M / M-D   (20-40mm)	Moderately reactive clay or silt sites. May experience moderate ground movement as a result of soil conditions and moisture changes.
Class H1 / H1-D (40-60mm)	Highly reactive clay sites. May experience a high amount of ground movement as a result of soil conditions and moisture changes.
Class H2 / H2-D (60-75mm)	Highly reactive clay sites. May experience very high ground movement as a result of soil conditions and moisture changes.
Class E / E-D (75mm+)	Extremely reactive sites. May experience extreme amounts of ground movement as a result of soil conditions and moisture changes.
Class P (this is approximately 70% of building sites in Australia)	Problem sites. The ability of the soil to evenly bear a load is very poor. Sites may be classified as 'Class P' as a result of mine subsidence, landslip, collapse activity or coastal erosion (e.g. dunes), soft soils with a lack of suitable bearing, cut and/or filled sites, or creep areas.   Ground movement as a result of moisture changes may be very severe, and these sites are typically subject to abnormal moisture conditions resulting from things like trees, dams and poor site drainage. If you are building on a Class P site you will need to consult a structural engineer.
The 'D' inclusion (i.e M-D, H1-D, H2-D or E-D)	The 'D' in these classifications refers to 'deep' movements in soil due to deep variances in moisture. These classifications are mostly found in dry areas (e.g. north of the Great Dividing range, in places like Stawell, Horsham, Mildura, Bendigo, Shepparton and Wangaratta).