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6 <br /> r <br /> w .► -rvr....xi.- .�.rr-ems..:,, -sr«^v+..,�q:+ -.xr <br /> Prohlac `Systemardesthe' soilenvironment`with the time and-'` <br /> conditions" 'necessary`'toreestablish, "the natural.system of checks and rX <br /> balances =' Biotic oxidation'is inhibited and there`is'low acidification <br /> of:'.:the`site.-.'material.'' Thev pH is maintained at a. level sufficient for <br /> the development--of.. beneficial"" heterotrophic--`bacterial--populations. <br /> -These• microorganisms . increase".the soil-moisture capacity and decompose <br /> Organic, matter, producing hunic materials,'"principally,polysaccharides, ,, <br /> that'aid the developmeiit'of''soil"structure and enhance plant growth:- <br /> These- factors : aid°"•the "natural'-`" succession "of' vegetation. Soi l <br /> „. - <a- <br /> bacteria",:prodia i""srowth' factors and..regulators-.that furthef' stimulate <br /> growth:`. Organic acids, inhibitory to T. ferrooxidans-,'are produced and <br /> the0 ""beneficial effects of an increasing heterotrophic bacteria <br /> population . begin. Vegetation produces plant, residues-.that, promote the , <br /> growth`,��o ig <br /> f= heterotrophs e.while --the-, decomposition-, products_ "of-- plant <br /> residue� destion w"mby"-=heterotrophic?,bacteria:-inhibit'T.' ferrooxidans. <br /> „Vutrients and - minerals ' are returned to the soil and are available for <br /> recycle, and reuse;_ while - a healthy,root system competes .for moisture. <br /> and - depriving it from the AMD bacteria. <br /> Bactericides, -- if designed with longevity mechanisms, help nature <br /> _ return mined land to a stable form, similar to conditions existing <br /> prior` to mining. Normally the acid production cycle can be broken. in <br /> three " to four years with ProMac Systems, while the controlled release <br /> pellets are designed with lives, in excess of seven years. <br /> After 'several.F completions around the Dynamic Cycle, ..(Figure 2) , <br /> the heterotrophic bacteria '_ out-number_ the _ AMD 'bacterial . in <br /> overwfielmingly ., high ratios; about - 100 - to 1 _.' After more than seven <br /> years, the ProMac pellets become" exhausted and the land is-once again <br /> self-revitalizing. <br /> THE BFGOODRICH APPROACH <br /> Application rates : _for ProMac Systems` are. site _ specific. <br /> Diagnostic - considerations (Table 2) are determined when field engineers <br /> _conduct a site'' evaluation. The team will -collect- soil' and-water <br /> samples - and :make__ a,-complete audit of physical characteristics of the <br /> site.' . - - �� <br /> `Following the site evaluation,--- specific laboratory analyses are <br /> conducted on the site material. Work includes incubation and column <br /> leach tests which help determine the degree of bacterial activity, acid <br /> producing potential, ' and the combination of ProMac Systems products <br /> required to remedy the problem.__ _ <br /> Once the - diagnosis` is complete;_ Pr6Ma spray and pellets_ are <br /> applied onto graded 'material. .,The applied using stai and <br /> reclamation -, equipment such-as'as' a hydroseeder, cyclone seeder,' or- drop <br /> spreader. Topsoiling": and _ standard , reclamation_ _ practices'of_ liming, <br /> fertilizing, 'seeding and mulching follow the application.- <br />