Before planning any construction site investigation is a must factor. Gathering the information about the given land for maybe highways or buildings magnifies the reasons land investigation to manifolds. Primary to gauge the land conditions. Site investigation in Sydney, Australia is typically concerned with the knowing the ground condition. Avoiding constructions in the marshy land or landslip area can be greatly risky and hazardous. Moreover, it can harm the construction work and cause it to collapse.
Whether it is you the need dredging, drilling, reclamation, marine engineering etc. no work can be started with the investigation. Site investigation drilling is the main aspect to inspecting the land. A precise estimate of the soil texture determines the geotechnical features and by that, it can be understood that whether the project will be successful or not. Land is formed of various layers and the quality differs in for each layer. It ranges from hard clay, sand, limestone, rocky soil and divergent roughness. 
Let’s take a glance on the main factors of ground investigations
Trial Pits
Trial pits are removed by hand or by machine while examining the ground condition. These are the cheaper than boreholes and are generally found at the depth of 3.50 with the help of standard machines.
Cable Thwak Boreholes
This is also called cable tools and is associated with tri-rings that can reach to more depths can only drill through weak rocks. Cable Thwak Boreholes is used while you need the information about greater depths; say around 5.00mbgl for guessing the ground condition there.
Geological Mapping and monitoring works
With the help of a gas analyzer, the concentrations of hazardous gasses in the depth of land can be known which essential for construction. And various technologies are used geological purposes which include drilling boreholes, reviewing the present boreholes.
After discussing all these aspects let’s talk about another primary point is of land investigation that is environmental drilling. The purpose of it is to inspect, analyze and monitor a particular site. The result is achieved through the various processes that cover’s applications like, hollow stem auger, mud or air rotary, geoprobeor direct push and sonic drilling. Environment drilling services require dealing with drilling liquids to reach the exact depth and then it’s then managed with solid control processes. In case of an environmental locations or sites, the drilling fluids must be restricted from reaching the non-desirable places of the grounds for keeping the nearby environment hazard-free. The most effective two techniques are mentioned bellow.
Sonic drilling
This type of drilling most efficiently provides continuous and unhindered core samples for every geological structure. Sonic drill simple and less impactful technique and is completely safe. It creates reasonably lesser drill extracts than auger helping in reduced use of resourced required finishing the project.
Air rotary
This drilling process is most effective for progressing boreholes in the fused bedrock formations. Air rotary method involves high-flow air is allowed in the drill string for removing the rock cuttings and managing the boreholes while the drilling process is carried. It’s one of the most impactful techniques and the size of the compressor decides the reachable depth, as it must have a velocity of around 2,500 feet in a minute.
