1-22276-01 site plan

Project No. 1-22276                                                                                                                  Page | 18
February, 2020
Ref: 1-22276, 2020-02-28, BR VER 2
Wessel Petroleum Pty Ltd – GEOTECHNICAL INVESTIGATION - Proposed Service Station Reconstruction, 52-54 Mary Street and Weyba Road,
Noosaville




           compaction. The soils may require conditioning to dry out/wet up, otherwise difficulties
           could be experienced in handling and achieving adequate compaction. This may require
           spreading, drying/wetting and mixing to achieve a uniform improvement in the materials.
          Imported select fill, as required for filling in structural areas should conform to the
           following specifications:-
                   Liquid Limit                 45%, maximum
                   Plasticity Index             15%, maximum
                   Aggregate Size               100mm, maximum
                   Shrink/Swell Index           Maximum of 1.0%
           Typical material that would conform to the above quality limits would be a good to fair
           quality overburden type material; such material would have a soaked CBR value of
           approximately 7 to 10%.
           The requirement to specify a minimum soaked CBR value is dependent on slab and
           pavement design issues; this matter should be referred to the Civil Engineer.
          Quality testing to confirm imported fill quality should be carried out prior to delivery to
           site; frequency of testing is subject to assessment by Soil Surveys Engineering,
           however, a sufficient number of tests should be carried out so that all parties are
           confident of material characteristics. Quality test results should be reviewed by Soil
           Surveys Engineering prior to construction.
           Contractors should submit details of their proposed fill source (with quality certificates)
           with their tender submission. The proposed fill source should be reviewed by Soil
           Surveys Engineering prior to awarding the earthworks contract.
          Pavement gravels should comply with the local authority quality specifications for base,
           sub-base and blanket materials.

           6.2.7       Compaction Procedures and Specifications

          Provided the placement moisture content of the select insitu material or imported fill
           approximates the appropriate optimum moisture content, suitable compaction should be
           achievable using appropriate compaction machinery, such as a 5t-10t vibrating roller.
           Layer thicknesses will be dependent on compaction plant type and size, use of vibration,
           material type and condition. However, materials should not be placed in layers
           exceeding 250mm, loose thickness.
          From a safety aspect, it may be prudent to use a good quality granular select fill (CBR
           15 minimum) in the lower levels of the deeper excavations e.g. tank pit, and compact
           with a minimum 15t excavator using an open wheel roller.
          The following minimum compaction values are recommended for the building and
           pavement areas.
                        Location                                   Cohesive Soils                     Cohesionless Soils
         Building areas                                                98%                                  75%
         Pavements areas
         - Top 300mm below subgrade level                                   98%                                  80%
         - Below the top 300mm                                              95%                                  70%
         Where the above values are the density ratios as determined by AS 1289 Test Series 5 (Standard compaction) for
         cohesive soils
         Where the above values are:
             1. The density ratios as determined by AS 1289 Test Series 5 (Standard compaction) for cohesive soils.
             2. The density indicies as determined by AS 1289 Test 5.6.1 (Standard method) for cohesionless soils.




                                                                                                            SOIL SURVEYS