System to manufacture native soils flowable fill and related methods

1. A method to manufacture a native soil flowable fill, the method comprising:

hydro excavating native soil to form a hole at a first excavation;

transferring the native soil from the first excavation to a debris tank;

adding a pozzolan component, cement and water to the debris tank;

mixing the native soil in the debris tank using a mixing apparatus to form a liquid comprising the native soil flowable fill; and

transferring the native soil flowable fill back to the first excavation into the hole;

wherein the liquid comprising the native soil flowable fill comprises a flowable state when transferring into the hole and after a desired period of time, the flowable state sets to a settable state.

2. The method of claim 1 , wherein the native soil flowable fill comprises 30-90% by weight of native soil, 0-50% by weight of the added pozzolan component, 0-50% by weight of the cement, and 10-45% by weight of the water.

3. The method of claim 1 , wherein an amount, by weight, of the added pozzolan component added to the native soil flowable fill comprises a function of an amount, by weight, of siliceous material present in the native soil when transferred to the debris tank.

4. The method of claim 1 , wherein an amount, by weight, of the water added to the native soil flowable fill is a function of an amount, by weight, of water present with the native soil when transferred to the mixing tank.

5. The method of claim 1 , further comprising:

using pressurized water to dislodge the native soil; and

using a vacuum hose with suction to excavate the native soil and the water from the first excavation to the debris tank.

6. The method of claim 1 , wherein the first excavation is defined by a geographic physical area where the native soil has the substantially same amount of the pozzolan component by weight, per volume of native soil.

7. A method to manufacture a native soil flowable fill, the method comprising:

removing native soil from a first excavation;

transferring the native soil from the first location directly to a debris tank;

adding a pozzolan component, cement and water to the debris tank;

mixing the native soil in the debris tank with the added pozzolan component, cement, and water to form a liquid comprising the native soil flowable fill using a horizontal mixing apparatus;

transferring the native soil flowable fill from the debris tank to the excavation; and

filling the first excavation with the native soil flowable fill;

wherein the liquid comprising the native soil flowable fill comprises a flowable state when filling the first excavation, and after a desired period of time, the flowable state sets to a settable state.

8. The method of claim 7 , wherein an amount, by weight, of the added pozzolan component added to the native soil flowable fill comprises a function of an amount, by weight, of siliceous material present in the native soil when transferred to the mixing tank.

9. The method of claim 7 , wherein an amount, by weight, of the water added to the native soil flowable fill is a function of an amount, by weight, of water present with the native soil when transferred to the mixing tank.

10. The method of claim 7 , wherein the pozzolan component comprises fly ash.

11. The method of claim 7 , wherein the pozzolan component comprises a natural pozzolana material.

12. The method of claim 7 , wherein an amount, by weight, of the cement added to the native soil flowable fill comprises a function of an amount, by weight, of sand present in the native soil when transferred to the debris tank.