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WORKPLAN <br /> The soil will be remediated using enhanced ex-situ bioremediation methods. Enhanced <br /> bioremediation utilizes naturally occurring soil microbes to degrade petroleum hydrocarbons <br /> in the soil. The soil will be spread in an approximate one foot lift on 10 mil plastic in the <br /> fenced yard shown on Figure A. The soil was moved to this location to facilitate site <br /> drainage within the Thomas Yard and to allow it to be remediated in a secure area. An <br /> earthen berm will be created around the soil to be remediated to prevent runoff during the <br /> rainy season. Water will be added to the soil by a sprinkler system to maintain a moisture <br /> content of approximately 20 to 30 percent. Periodically nitrogen will also be added to the <br /> soil to enhance microbial growth. The nitrogen will be added at rates not exceed <br /> agricultural usage. <br /> After the initial application of nitrogen, the spread soil will be worked twice a month with <br /> a disc. The discing period will begin in April 1993. The soil will be maintained by periodic <br /> watering and discing. The owner will visit the site at least weekly to ensure that the soil <br /> does not dry out and cause a dust condition when subjected to wind action. After a period <br /> of four to six weeks, the spread soil will be sampled to determine remediation effectiveness. <br /> The goal of remediation is a TPH concentration of 10 parts per million or less. Upon <br /> reaching the remedial goal, a request will be made for site closure from San Joaquin <br /> County. The remediated soil will then be used for fill at the site. <br /> POSSIBLE HAZARDS <br /> There are no possible hazards to the public if the soil is remediated in accordance with the <br /> proposed plan. The soil does not contain volatile compounds that could effect the <br /> surrounding air. The soil will remain in a fenced, locked area. Runoff and blowing dust <br /> will be prevented by berming the soil and maintaining a moist condition by an automatic <br /> sprinkler system. <br /> Ground water at the site is greater than 70 feet below ground surface and is overlain by <br /> tight clay soils. The remediated soil will not impact ground water or surface waters, <br /> adjacent surface soils. <br /> f:\projects\exsum.193 <br />