Gilbert R Tallard

58141472, Sep 29, 1998

Jan 21, 1997

8/784549

Gilbert Tallard - New York NY

Envirotrench Company - Pelham NY

E02D 312

106900

A method of strengthening and improving the load-bearing capacity of soft clay-containing subterranean soil comprising advancing a soil processing tool into said subterranean soil to break said soil into discrete particles; while advancing said soil processing tool into said soil, introducing an aqueous composition consisting essentially of water and a clay dispersant in an amount sufficient to disperse said discrete particles and make water from said clay available for hydration of subsequently added cement; when the soil processing tool has reached its desired depth, withdrawing same and simultaneously adding during said withdrawal a cementitious composition comprising water and a cement in a water-to-cement weight ratio of 0. 4 to 1:1 and in an amount which provides a weight ratio of the total water of said aqueous dispersant containing composition, said clay soil and said cementitious composition to said cement of about 4 to 6:1; and allowing said mixture to harden.

45430160, Sep 24, 1985

Nov 14, 1983

6/551463

Gilbert R. Tallard - Pelham NY

E02D 518

405267

The invention comprises a method for making an underground barrier for hazardous leachate that includes digging a trench under biodegradable slurry adjacent a contaminated area, placing a liquid impervious membrane on one side of the trench and securing it by an impervious plug of material lining the bottom of the trench adjacent the membrane's lower end. A drain pipe and risers are positioned in the slurry into which filter gravel is subsequently added.

56116438, Mar 18, 1997

Aug 10, 1995

8/513548

Gilbert R. Tallard - Pelham NY

Envirotrench - Pelham NY

E02D 1712
F16L 5700

405157

In the process for the construction of trenches in ground containing water and/or gas wherein a trench is due in said ground, support media is introduced in said trench to support the walls formed by the treching, vapor or water conduit means are placed in the trench and the trench with this support media is back-filled with particular material to dispose and remove the support media from the trench, the improvement comprising employing as said support media a hydrated cross linked acrylic polymer.

47267135, Feb 23, 1988

Jun 16, 1986

6/874684

Gilbert R. Tallard - Pelham NY

E02D 2700

405267

An improved stable, clay/cementitious composition comprised of 15%-55% Attapulgite clay and 85%-45% slag cement particularly useful in the construction of very low permeability, self-hardening slurry trench cutoff walls, has been discovered. The aqueous slurries of the invention exhibit (1) an initial viscosity controllable without the addition of chemical, (2) lower filtrate loss and (3) chemical resistance, (4) lower permeability on curing, and (5) expedient handling.