the preferred embodiment of the present invention is a system for combining biological elements , chemical elements , mechanical apparatus and methods for bio - remediating soil , and the apparatus of the system is illustrated generally at 10 in the drawings as it would appear when assembled . to prevent any possible leakage from system 10 to its immediate surroundings at least a 10 mil thick sheet of plastic 12 is placed on the ground at the site location . sand is than provided covering plastic sheet 12 to a depth of at least four ( 4 ) inches . plastic sheet 12 with the added sand prevent any direct contact of the bottom surface of system 10 and the chosen site . assembly of the system 10 on the sand and plastic sheet 12 begins with a plurality of substantially rectangular floor panels 15 each having at least one flat surface and preferable made of at least 1 / 8 &# 34 ; steel sealably connected in a side by side relationship and overlying sheet 12 . those floor panels may , if desired , be constructed from flat metal plates rigidly affixed to a metal frame , or the plates and frame may , if desired , be made from any other convenient material suitable for the intended purpose of the present invention , such as wood , corrugated metal , fiber reinforced plastics , or the like . the flat surfaces of the floor panels 15 are upwardly facing . those floor panels 15 have a rubber sealing gasket 13 inserted between adjoining members to sealably secure the floor members 15 when fully assembled . the floor panels 15 are affixed to at least 2 × 4 steel or 2 × 4 inch &# 34 ; l &# 34 ; angled beams ( not shown ) to provide the necessary support structure for those floor panels 15 to define a substantially rectangular floor for the system 10 that is strong enough to support 2 to 6 feet of contaminated soil and the weight of the transport vehicle 30 . the system 10 further comprises a plurality of substantially rectangular upstanding wall panels 14 each having at least one flat surface and at least one sealable end surface . in the preferred embodiment the wall panels are at least 1 / 8 &# 34 ; steel plate having a rubber seal 13 inserted between the wall panels 14 in a sealably connected side by side relationship . the bottom edges of panels 14 are sealably engagable with the peripheral edges of the floor panels 15 for enclosing the container &# 39 ; s floor on four sides , thereby deigning a four cornered container 11 capable of receiving at least 100 cubic yards of contaminated soil . triangular braces 14a reinforce the bottom portions of wall panels 14 . the interconnection of the edges of the wall members adjacent to each other may , if desired , be abutting , pined , dovetailed , or tongued and grooved . the preferred embodiment for the present invention utilizes a guide pin 52 ( fig1 ) insertable into receiving hole 52a , guide pin 52 is secured at one end by retaining weld 52b . pin 52 and receiving hole 52a combinations are spaced throughout wall panels 14 , floor panels 15 , and door 16 to provide the necessary aid to alignment in assembly of container 11 . see fig1 . the assembled floor panels 15 and wall panels 14 are preferably reinforced by stressed cables 56 ( fig8 ). referring to fig1 - 3 , one of the upstanding walls of container 11 defines at least one outwardly opening door 16 from one end of the container . door 16 has a lateral width sufficient to provide for convenient entry of a large transport vehicle 30 ( fig2 ) for depositing the contaminated soil 32 within the container 11 . the entry of the container 11 may , if desired be a single , double , or even rollup overhead door . the single or double doors that open outwardly may be also of the type that open downwardly to provide a ramp for vehicles . suitable seals ( not shown ) effect the sealing of doors 16 when closed . fig3 illustrates container 11 having deposited therein a quantity of contaminated soil 32 and closed doors 16a ( sealably secured ), containing all soil plus water to be added within container 11 . if desired , plastic foam 14b may be added to the exterior faces of wall panels 14 for insulation in cold climates . referring to fig4 system 10 is completed with a water supply ( not shown ) and a conventional heat exchanger , a water recirculating pump , air supply , retaining tank , and water cyclone filter that all are well known in the art and will be collectively referred to as an auxiliary unit 20 . unit 20 may , if desired , be trailer mounted as shown in fig4 c . water is pumped into container 11 from auxiliary unit 20 with the appropriate chemicals and microbes to bio - remediate soil 32 already added , to produce a water pool 33 above soil 32 having a depth of one to two feet or more . after achieving the desired depth , the pool water is recirculated through the heat exchanger and the cyclone filter by the pump contained in auxiliary unit 20 . a buoyant float assembly 18 operatively connected to auxiliary unit 20 is disposed on the surface of water 33 . auxiliary unit 20 provides conventional apparatus for supplying pressurized air and recirculated pool water to float 18 . float 18 has a manifold 18c ( fig6 ) that receives pressurized water and air from auxiliary unit 20 . manifold 18c directs the water and air to a plurality of downwardly facing adjustable jets 18d . those jets 18d are adjustable to provide a mixed flow of water and air at the rate of at least 50 gallons per minute . that high flow of pressurized water and air agitates and shears contaminated soil 32 . the chemicals added to the water will break down soil 32 to extract hydrocarbon compounds from the contaminated soil 32 . the hydrocarbon compounds will float to the surface of the water 33 and are skimmed off through a suction pump 18m located on float 18 to a tank within auxiliary unit 20 for further processing or for resale . assume that the hydrocarbon contaminated site is a tank farm for oil storage that has leaked oil into the soil over a period of years . the site is now desired to be remediated and returned to an uncontaminated . the oil contaminated soil is excavated and then deposited into container 11 by a front - end loader 30 . doors 16 are closed and sealed , the edges of plastic sheet 12 are layered around the exterior of container 11 isolating system 10 from the job site . water 33 , combined with the appropriate chemicals and microbes is added to system 10 until the volume of water to soil ratio is about 40 % or about 15 &# 34 ; of water above 3 &# 39 ; of soil . pressurized air and recirculated water is then supplied to float 18 . float 18 begins to agitate , aerate , and break apart the contaminated soil 30 until soil 30 is emulsified . float 18 concurrently moves about the interior of the container 11 of system 10 without being monitored by any external source . float 18 will continue its movement uninterrupted by any floating matter within the container by flexible hose air / water jets 18f ( fig7 ) extending outwardly from float 18 . the oil will begin to separate from the contaminated soil and float to the surface of the water 33 . that oil will be siphoned off by a suction pump 18m ( fig6 ) mounted on float 18 . that oil will than be pumped through hose 18b into a holding tank within auxiliary unit 20 . in the event the contaminated soil 32 contains volatiles or fumes that may be hazardous , a plastic cover 36 having weighted edges 36a , as schematically shown in fig4 a may be added to container 11 to prevent such fumes from escaping . upwardly spraying water jets 18g ( fig6 ) are mounted on float 18 to receive pressurized recirculating water 33 from manifold 18c . the upwardly recirculated spraying water 33a will trap airborne vapors and return them to the pool of water 33 so that they may be absorbed by the microbes . fig4 a also illustrates sump pump 20a that is utilized to siphon water 33 from container 11 . the total volume of water 33 delivered to container 11 by float 18 is equal to the total volume of water 33 siphoned from container 11 by sump pump 20a and skimmer 18m . fig4 b illustrates system 10 with an elevated plastic cover 38 that may be added to system 10 if desired . cover 38 is supported on frame 39 which mounts a separate spray system 40 , comprising a plurality of spraying heads 40a that provide a fine mist of water above the surface of the pool of water 33 . this mist will trap fumes and colloidal size particles and return such to the surface of the pool of water 33 . fumes are also removed by a flow of air above and across the mist spray of sprayheads 40a . that flow is provided by intake fan 40b and exhaust fan 40c . fig4 c illustrates a side view of system 10 with a carbon filter air scrubber 40e attached to duct 40d which connects to exhaust fan 40c . air intake fan 40b provides air movement across the upper portion of the interior of system 10 . exhaust fan 40c provides air flow from the interior of system 10 to the air scrubber 40e . air scrubber 40e will remove any hazardous fumes or volatiles from the air and then release the cleaner air into the surrounding environment . fig6 illustrates a cross - sectional view of float 18 . a torus shaped buoyant member 18i is partially filled with liquid 18j to lower or raise float 18 in container 11 when the bottom of float 18 is in contact with pool water 33 . that liquid 18j may be water , oil , or a liquid of a density to allow float 18 to be buoyant in any chosen media for bio - remediation . in the preferred embodiment that liquid is water . a plurality of rollers 18e are disposed around the periphery of buoyant member 18i to cooperate with lateral flexible hose air / water jets 18f allowing float 18 to move freely throughout container 11 without becoming wedged or trapped in a fixed location . fig7 illustrates the top of float 18 showing the manifold 18c for supplying air and water to jets 18g . those jets may , if desired , be manually turned on for continuous water spray or turned off for no water spray . vertical support members 18l attach to float 18 and provide support for manifold 18c and sprayers 18g . the method of assembly of system 10 is best understood by viewing fig8 in conjunction with fig9 shown without foam 14b and fig1 . a plurality of floor panels 15 are assembled in a side by side relationship on top of the sand ( not shown ) residing on plastic sheet 12 . each side panel 14 and floor panel 15 has a plurality of pins 52 extending along one mating edge and a plurality of receiving holes 52a along the other mating edge of the panel . the mating edges of wall panels 14 and floor panels 15 are secured to each other by bolts 54 and nuts 54a , as shown in fig1 . a rubber sealing casket 13 is inserted between joining floor and wall panels providing a liquid impermeable seal . a sealing tape ( not shown ) is placed over all joining edges further providing a seal that will prevent any liquid from leaking out of system 10 into the surrounding environment . a plurality of bolts 54 and nuts 54a similarly secure and seal the two doors 16 to each other and to the floor panel 15 and the door hinges 16a . whenever the container 11 is to be employed in an area where the ambient temperatures fall below 70 ° f ., it is highly desirable to heat the recirculating pool water by the heat exchanger incorporated in auxiliary unit 20 so as to maintain the pool water preferably at or about 92 ° f . at this temperature , the propagation of the microbes is at a maximum and can well justify the extra cost of heating the recirculating pool water by a substantial reduction in the time required to remediate the contaminated soil . in a particular embodiment of this invention , the chemical composition to be inserted into the pool water may comprise at least one wetting agent ( 1 - 7 % by volume of the chemical composition ) and a combination of salts ( 4 - 6 lbs of salts per gallon of the chemical composition ) selected from the group consisting of ammonium surfate , ammonium nitrate , ammonium chloride and calcium chloride . in another embodiment of this invention , the chemicals composition to be inserted into the pool water may also comprise a strong acid ( 5 - 12 % by volume of the chemical composition ), such as phosphoric acid or surfuric acid . in yet another embodiment of this invention , the wetting agent used in the chemical composition may comprise at least one of dodecylbenzene sulfonic acid , a fatty amide - phosphate ester salt , and monoisopropylamine dodecyl benzene sulfonate . in still another embodiment of this invention , an aqueous solution of ammonium , calcium and phosphate ( 1 - 10 % by volume of the chemical composition ) and / or a solution of humic acid ( 1 / 2 - 1 % by volume of the chemicals ) may also be a part of the chemical composition as nutrients for the microbiological agents . these act as nutrients for the microbiological agents as well as chelators for the metals present in the soil . in another embodiment of this invention , terpene or limonene ( up to 100 % of the volume of the chemical composition already inserted into the pool of water ) may be added separately to the pool of water into which the chemical composition has already been inserted . terpene and limonene enhance the effect of the chemical composition on tars and paraffin and asphaltene compounds trapped in the soil . in yet another embodiment of this invention , an additional amount of an aqueous solution of ammonium , calcium and phosphate ( up to 100 % of the volume of chemical composition already inserted into the pool of water ) may be added separately to the pool of water into which the chemical composition has already been inserted . this solution gives additional nutrients for the microbiological agents as well as acting as a chelator for the metals present in the soil . in still another embodiment of this invention , an additional amount of monoisopropylamine dodecyl benzene sulfonate ( up to 100 % of the volume of the chemical composition already inserted into the pool of water ) may be added separately to the pool of water into which the chemical composition has already been inserted . this increases the effectiveness of the chemical composition in breaking down particularly clayey soil and enhances the effect of the chemical composition on tars and asphaltene compounds trapped in the soil . in another embodiment of this invention , an additional amount of phosphoric acid or sulfuric acid ( up to 0 . 001 % of the volume of the pool of water ) may be added separately to the pool of water into which the chemical composition have been inserted . this is necessary to lower the ph to the range of 5 . 5 - 6 . 5 , at which range the microbiological agents work most efficiently . in a preferred embodiment of the invention , the total volume percentage amount of the chemical composition in the pool of water should be in the range of 0 . 032 - 0 . 056 % in order to both preserve the effectiveness of the chemical composition to break down and release the hydrocarbons entrapped in the soil and to enhance the growth of the microbes . the microbiological agents employed in practicing the method of this invention may be those available from a number of suppliers , such as e . r . i ., oppenheimer , tesoro , and koseki . the microbiological agents used may comprise anaerobic , aerobic and facultative bacteria . any of the biological treatment agents listed in the aforementioned smith patent ( u . s . pat . no . 5 , 039 , 415 ) may be utilized , which include achromobacter , arthobacter , aspergillus , bacillus , candida , cladosporium , corynebacterium , myrothecium , nocardia , punicillium , phialophora , pseudomonas , rhodotorula , streptomyces , trichoderma , and a blend of anaerobic and facultative organisms . the selection of the most appropriate microbes depends , of course , on the nature of the contamination . all of the foregoing chemicals and microbiological agents are biodegradable and , to the extent that they are left over in the soil after the bioremediation process is completed , they actually act as fertilizing agents to promote the growth of plant life in the soil . a 55 gallon batch of one embodiment ( ps 45 ) of the chemical composition according to the present invention was prepared by mixing the following ingredients : one half gallon ( 4 pounds ) of soft dodecyl benzene sulfonic acid ( ddbsa ) ( c - 90 manufactured by pilot chemical ); 16 fluid ounces ( 1 pound ) of a fatty amide - phosphate ester salt ( amidex 1248 manufactured by chemron ) and 1 gallon ( 8 pounds ) of monoisopropyl amine dodecyl benzene sulfonate ( prs manufactured by pilot chemical ). the above mixture was dissolved in approximately 33 gallons of water to make a total of 55 gallons of composition . a 55 gallon batch of another specific embodiment ( ps 43 ) of the chemical composition according to the present invention was prepared by mixing the following ingredients : one half gallon ( 4 pounds ) of monoisopropyl amine dodecyl sulfonate ( prs manufactured by pilot ); 16 fluid ounces ( 1 pound ) of a fatty amide - phosphate ester salt ( amidex 1248 manufactured by chemron ). the above mixture was dissolved in approximately 33 gallons of water to make 55 gallons . another specific embodiment ( ps98 ) of the chemical composition according to the present invention was prepared by adding 4 gallons phosphoric acid to a 55 gallon batch of the mixture of example 2 ( ps 43 ). another specific embodiment ( ps 42 ) of the chemical composition according to the present invention was prepared according to the procedure described in example 2 except that 250 lbs instead of 100 lbs . of ammonium nitrate was added and no ammonium sulfate was added . the soil to be treated was tested to determine the type of soil , the type of contaminants and the percentage amount of contaminants in the soil . 5 gallons of the composition of example 4 ( ps 42 ) were mixed together with 1200 gallons of water . to this mixture was added one and one quarter gallons of phosphoric acid ( approximately 0 . 1 % by volume ) to lower the ph of the mixture to 5 . 5 - 6 . 5 . one gallon of prs and 5 gallons of terpene were added to the composition because the soil contaminants were high in tar and asphaltenes . as a source of nutrients for the microbes and as a chelator for metals which may otherwise poison the microbes , 5 gallons of an aqueous solution of ammonium , calcium and phosphate ( 4 % by weight of nh 4 , 11 % by weight of ca and 11 % by weight of p 2 o 5 known as 4 - 11 - 11 ) was added as well as one haft gallon of humic acid ( enhance ® tha manufactured by western nutrients corporation ). the container of the present invention was loaded with soil approximately three feet deep . the above aqueous solution was applied by high pressure spray onto the top of the soil in the container to form a water blanket . the high pressure spraying of the solution onto the soil had a shearing action on the soil which caused the clayey soil to break down into a super - saturated slurry . the soil was wetted to the small particle level which liberated the contaminants into the water blanket . all oils which traveled to the surface of the water blanket were siphoned off . within two days , approximately 90 % of the oils contaminating the soil had risen to the surface and been siphoned off after two days of pressurizing the soil with water , chemicals and siphoning , no more oil appeared on the surface of the water blanket . after all oil had been siphoned from the surface of the water blanket , a solution of microbes was added to the soil in the amount of 1 pound of microbes per 10 square yards of soil surface . the microbes , before being mixed into solution , were at a concentration of 23 billion bacteria per gram count , of which amount 40 % of the bacteria were anaerobic , 40 % were aerobic and 20 % were facultative . before being applied to the soil , the microbes were added to the water pool . at this point , an aqueous solution of ammonium , calcium and phosphate ( 4 % n , 11 % cao and 11 % p 2 o 5 known as 4 - 11 - 11 ) was also added to the microbe solution to 0 . 05 % by weight as a nutrient for the bacteria . humic acid ( enhance ® tha manufactured by western nutrients corporation ) was also added to the solution to 0 . 01 % by weight . the aqueous solution of ammonium , calcium and phosphate serve as nutrients for the bacteria and as chelating agents to promote multiplication of the bacteria . the water pool , which now contained the microbes , was then mixed with pure oxygen gas and pumped by high pressure into the slurry soil where the microbes proceeded to break down the 10 % of hydrocarbon contaminants remaining in the slurry soil and the water blanket . in order to speed up the microbes &# 39 ; breakdown of the contaminants and also to help the microbes grow , the soil slurry and water blanket were maintained at a temperature of 90 °- 95 ° f . when the water cleared , the water and soil were tested for contaminants . the process was finished when the tests showed that the contaminants were below the allowable levels . the water in the water blanket was then pumped into another container for reuse and the soil was removed to a designated area . the container was then refilled with contaminated soil and the process started over again . approximately 5 grams of a btex ( benzene , toluene , ethylbenzene , xylene ) contaminated soil was added to both a beaker containing 40 ml of warm water + 1 ml ps98 ( as described in example 3 above ) and another with 40 ml warm water + 1 ml alconox soap ( to serve as a control ). both mixtures were stirred and filtered . both filtered soils were rinsed with 10 ml water and allowed to air dry for approximately one hour before being stored in a refrigerator in separate glass jars . the alconox control soil broke during storage so much of the btex in the control evaporated off before it could be tested . therefore , the btex numbers for the control soil are much lower than would be expected but still higher than the btex numbers for the ps98 treated soil . the ps98 effluent was also stored in a 40 ml voa vial for later btex analysis . the btex tests were conducted according to epa test methods for evaluating solid waste , sw - 846 , 3rd edition , november , 1986 . analytical methods were : btex in soil or water 5030 / 8020 ; tph in water 418 . 1 ; tph in soil modified 8015 ( gc / fid ). the btex tests gave the following results shown in table i : table i__________________________________________________________________________ ethyl - total benzene toluene benzene xylene btex tph ( ppb ) ( ppb ) ( ppb ) ( ppb ) ( ppb ) ( ppm ) __________________________________________________________________________soil before treatment 302 712 54 86 1154 1189method blank for & lt ; 10 & lt ; 10 & lt ; 10 & lt ; 10 & lt ; 10 & lt ; 5untreated soilmatrix spike recovery 101 % 86 % 46 % 45 % n / a -- for untreated soilis98 treated soil 29 43 & lt ; 10 10 82 -- alconox treated soil & lt ; 10 27 67 45 139 --( control ) ps98 treated soil 4 5 10 6 25 -- effluentmethod blank for & lt ; 10 & lt ; 10 & lt ; 10 & lt ; 10 & lt ; 10 & lt ; 5treated soilmatrix spike recovery 126 % 75 % 69 % 68 % n / a 109 % for treated soil__________________________________________________________________________ from the foregoing description it will be readily apparent to those skilled in the art that large batches of the contaminated soil may be treated at any location by assembly at such location of the container 11 and the other elements of the system 10 . large earth moving units can be employed to bring contaminated soil within the container 11 and , due to the utilization of a pool of water containing chemicals and microbes , the entire batch may be efficiently and remediated with a minimum expenditure of time . in fact , the size of the batch does not automatically increase the time of remediation , since the container 11 will be larger and can contain a larger quantity of water carrying the treatment chemicals and microbes . the recovery of hydrocarbons rising to the surface of the pool of water is a unique economic advantage of the system . additionally , the fact that used the recirculated water may be transferred to a tank truck when the remediation activities at one site is completed greatly adds to the economy of the entire system . to move to a new location , the panels forming the container 11 are unfastened and loaded on to ordinary highway trucks , as is all of the other apparatus heretofore described , such as the auxiliary unit 20 . no permanent structures are required to be erected and the actual site of the container 11 is protected from contamination due to the fact that the container 11 is mounted upon the plastic sheet 12 . the invention now being described , it will be apparent to one of ordinary skill in the art that many changes and modifications can be made thereto without departing from the spirit or scope of the invention set forth in the appended claims .