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Fife Characterization attd Sc �mediafiat Plata: 7500 Goes!Eleventh Street. Tracy, 1. Page 21 <br /> f> (bio-stimulation). It is rarely found that the population of native biota is <br /> insufficient to provide the bioremedial action required for cleanup of fuel <br /> hydrocarbons. However, if necessary, the spread soil can be treated with an <br /> innoculum of imported biota. That is not expected to be the case at the subject <br /> property, accordingly, the following bioremediation regimen is proposed. <br /> ❑ Broadcast a mixture of agricultural fertilizer containing <br /> nitrogen and phosphorus over the entire spread of soil to be <br /> treated at a rate of one lb. per sq. yd- This fertilizer mix should <br /> contain nutrients in the approximate ratio of Phosphorus 2: <br /> Potassium 0- Nitrogen 10_ Standard formulations of <br /> agricultural fertilizers are not usually available with these <br /> i nutrient ratios, but 'appropriate mixtures can be created by <br /> adding ammonium sulfate to commercially available mixes. <br /> i The potassium content of the mixture applied to the spread. <br /> ' soil should be held to the minimum practicable concentration. <br /> �:- ❑ Thoroughly rototill the fertilizer into the spread soil. <br /> Q Construct an array of removable, minimal discharge irrigation <br /> spray nozzles to provide for complete coverage of the soil <br /> spread. The irrigation array will be supplied from on-site <br /> water. <br /> I_ =` ❑ Adjust the irrigation flow rate and timing to maintain soil <br /> moisture content between 20% and 60% of saturation- <br /> ❑ The soil will be periodically analyzed for nitrogen and <br /> phosphorus content and pH. <br /> 'J <br /> Notes: <br /> ■ The preferred pH of the soil is slightly alkaline, at 7 0 <br /> '< to 7.5. If the pH varies significantly from this range, it <br /> should be cautiously adjusted by addition of judicious <br /> quantities of hydrated time or an acid balance product. <br /> "1 <br /> ■ The nitrogen content of the soil should be maintained <br /> in excess of 5 0 ppm (parts per million) at all times, <br /> the concentration of phosphorus should be above 1 0 <br /> PPM. <br /> : i <br /> ❑ Remove the irrigation system from the soil spread and <br /> broadcast additional fertilizer at the rate of 1 lb. per sq. yd., or <br /> at such other rate as is indicated by the results of the soil tests <br /> performed above. <br /> sic <br /> i <br />