Landscape Technical Specification - OPW14/0197

Doonella – Stage C
         No sharp items or chemical components deemed as dangerous to health or safety to be present
          i.e., metal, glass;

         Free from damaging levels of phenolic and tannic toxins - Refer AS 3743 Appendix E;

         Soil must comply with toxicity index criteria as stated in AS 4419 clause 5.11 and Appendix F;

Vegetative reproductive material shall be absent. The Contractor shall also confirm in writing that the
topsoil does not contain “Nutgrass” (Cyperus rotundus). If the weed is present, the Contractor shall notify
the Superintendent immediately with recommendations for its complete removal. Remove the weed by the
approved method.

         Soils must not contain chemicals that will result in contamination of land (e.g. heavy metals,
          hydrocarbons, pesticides, etc).

         Soils must not contain fire ants or nesting material.

         Composted organic matter for native plants should be low in phosphorous such as fully composted
          slash-pine bark.




7.3       TOPSOIL STORAGE

If it is necessary to stockpile topsoil on site do so in locations as directed by the Superintendent, to heights
not exceeding 900 mm. Protect from wind.




7.4       DELIVERY DOCKETS

Provide delivery dockets for all topsoil. Show volumes, soil types, purchaser, and all relevant signatures to
confirm the above.




7.5       PLACING TOPSOIL

General: Spread the topsoil on the prepared subsoil and grade evenly, making the necessary allowances to
ensure that finished levels and contours may be achieved after light compaction.


7.5.1     CONTAMINATION

Where diesel oil, cement or other phytotoxic material has been spilt on the subsoil or topsoil, excavate the
contaminated soil, dispose of it off the site, and replace it with imported topsoil to restore design levels.


7.5.2     FINISHING

Feather edges into adjoining undisturbed ground.


7.5.3     CONSOLIDATION

Compact lightly and uniformly in 150 mm layers. Avoid differential subsidence and excess compaction and
produce a finished topsoil surface that has the following characteristics:

                    Finished to design levels.

                    Smooth and free from stones or lumps of soil.

                    Graded to drain freely, without ponding, to catchment points.

                    Graded evenly into adjoining ground surfaces.


AECOM                                             3