while the present invention is susceptible of embodiment in various forms , there is shown in the drawings and will hereinafter be described a presently preferred , albeit not limiting , embodiment with the understanding that the present disclosure is to be considered an exemplification of the present invention and is not intended to limit the invention to the specific embodiments illustrated . illustrated is a schematic that depicts the method and apparatus of the instant invention . in particular , the method and apparatus allows for a precise amount of sodium silicate and catalyst to be admixed with water for use in soil stabilization . a sodium silicate tank 10 having a control valve 12 is coupled to sodium silicate pump assembly 16 by sodium silicate suction line 14 . the sodium silicate pump assembly 16 is preferably a centrifugal pump . the sodium silicate pump 16 is powered by a hydraulic motor 18 . the motor allows for the operator to vary the speed of the motor and control pump output . however other motors could be installed , such as but not limited to an electric motor with a variable frequency driver . a catalyst tank 20 is coupled to a catalyst chemical pump 24 by suction line 22 . the catalyst chemical pump 24 is a hydraulically operated variable proportioning mixing pump . a water tank 30 is provided with feeder line 32 attached to the suction side of a water and catalyst pump 40 . in a preferred embodiment , the water and catalyst pump 40 is a centrifugal pump . however , any suitable pump can be installed such as but not limited to gear pumps and vane pumps . catalyst is fed into the water tank feeder line 32 through a bypass loop consisting of first valve 34 which feeds into the catalyst chemical pump 24 . the water and catalyst mix is discharged into a line controllable by discharge valve 36 into the feeder line 32 . a bypass valve 38 is installed in the water feeder line 38 . by opening valve 38 and closing valves 34 and 36 the catalyst chemical pump can be isolated and the system flushed . the water and catalyst pump 40 is powered by a hydraulic motor 42 . this water and catalyst pump allows for the operator to vary the speed of the flow rate and control pump output . other motors could be installed , such as but not limited to an electric motor with a variable frequency driver . a hydraulic power unit 50 provides hydraulic fluid to the hydraulic motors . a hydraulic flow divider 52 is installed to direct the flow to each of the hydraulic motors 18 and 42 . a first hydraulic control valve 54 operated the sodium silicate pump assembly 16 hydraulic motor 18 . a second control valve 56 operates the water and catalyst pump 40 hydraulic motor 42 . for ease of on - site operation the hydraulic control valves are manually operated . once the soil at the particular site is tested by use of a sampling port , the controls can be maintained throughout the process . the sodium silicate pump 16 has a discharge line 58 with a pressure gauge 60 to monitor flow rate pressures . a flow meter 62 is also positioned in the discharge line 58 having a digital flow rate display 64 . a check valve 66 prevents backflow into the system . similarly , the water and catalyst pump 40 has a discharge line with a pressure gauge 46 installed in the line for visual monitoring flow rate pressures . flow meter 70 is installed in the discharge line and connected to a digital flow rate display 72 . check valve 74 prevents a backflow of the water and catalyst . discharge lines 44 and 58 are fluidly coupled to a static mixer 76 sized to intermix the fluids at the maximum flow rate expected from the pumps . the static mixer 76 is a pipe internally comprising of mixing elements such as blades and helix grids geometrically configured to facilitate radial mixing . the flow path is directed in a specific geometrical path in order to ensure that the entire flow is subjected to uniform mixing . the discharge line 60 includes a bleed line 24 for sampling and monitoring . a pressure gauge 80 provides a final pressure check and is constructed and arranged to cooperate with attachment of a substantially flexible hose 82 after shutoff valve 84 . the flexible hose has a fitting 86 constructed and arranged for attachment to a ground injection pumping device . the disclosed invention is intended to be portable . therefore an enclosed trailer of a suitable size , capable of being attached to a vehicle , is used to house all of the components of the invention . however , it is contemplated that another vehicle such as a box truck could be utilized to transport the equipment . once grout injection is called for , sodium silicate is pumped into the system through the sodium silicate pump 16 . in a preferred embodiment , the aqueous sodium silicate comprises 50 % of the mixture . however , a higher or lower concentration of the sodium silicate could be used without deviating from the scope of the invention . the sodium silicate pump discharge is monitored using the digital flow meter 64 at a predetermined rate . simultaneously , water flows into the system through the catalyst pump . the catalyst and water are mixed in the catalyst pump . in a preferred embodiment , the catalyst is diacetin , a food grade acid with the chemical symbol ch 3 cooch 2 ch ( oh ) ch 2 ococh 3 . the catalyst is mixed at a ratio of between 5 - 20 % of the volume of the water . the catalyst and water mixture is then pumped through the water and catalyst pump 1 . the water and catalyst pump 1 discharge corresponds with the predetermined discharge rate of the sodium silicate pump 16 using the digital flow rate display 72 . the discharge pressure is monitored at the pressure gauge 80 downstream of the static mixer . in a preferred embodiment , the discharge pressure is maintained in a range from 25 psi to 45 psi . the discharge pressures are maintained by varying the flow of hydraulic fluid to the hydraulic motors 18 and 42 . the sodium silicate , catalyst , and water are mixed as a function of the discharge volume rate pumping into the ground . the volume of each pump output is determined by factors such as the rate of cure of the mixture as well as the size of the underground space to be filled . the rate that the sodium silicate mixture will cure is dependent on many variables . these factors include but are not limited to , moisture , temperature , position and depth of the void to be filled . a predetermined amount of discharge is collected through the bleed line in order to determine the rate of cure . injection pumping device 90 is inserted into the ground and pumping of the mixture is conducted in stages . the initial pumping is done at the maximum depth of the void . the injection pumping device is then retracted systematically to pump at different levels in the soil . generally , 5 gallons of mixture is pumped per foot of lift . the pumping is terminated at each level when a predetermined discharge pressure threshold is exceeded indicating that the intended space has been filled . all of the steps are repeated until the required amount of sodium silicate based grout is pumped into the ground . it is to be understood that while a certain form of the invention is illustrated , it is not to be limited to the specific form or arrangement herein described and shown . it will be apparent to those skilled in the art that various changes may be made without departing from the scope of the invention and the invention is not to be considered limited to what is shown and described in the specification and any drawings / figures included herein . one skilled in the art will readily appreciate that the present invention is well adapted to carry out the objectives and obtain the ends and advantages mentioned , as well as those inherent therein . the embodiments , methods , procedures and techniques described herein are presently representative of the preferred embodiments , are intended to be exemplary and are not intended as limitations on the scope . changes therein and other uses will occur to those skilled in the art which are encompassed within the spirit of the invention and are defined by the scope of the appended claims . although the invention has been described in connection with specific preferred embodiments , it should be understood that the invention as claimed should not be unduly limited to such specific embodiments . indeed , various modifications of the described modes for carrying out the invention which are obvious to those skilled in the art are intended to be within the scope of the following claims .