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\,,. <br /> Mr. Cecchini <br /> October 21, 1992 <br /> Page 2 <br /> In July of 1992, the former owner, Delta Truck, foreclosed the property to Cecchini, <br /> Cecchini & Giovannoni. These new owners, are actively seeking to clean up the site. This <br /> workplan is for onsite remediation of the stockpiled soil from the former Thomas Yard <br /> underground tank area. <br /> Stockpile Sampling <br /> On August 5, 1992, ESE went to the subject site for the purpose of sampling the stockpiled <br /> soil to determine the current status of the soil including hydrocarbon concentrations. A <br /> total of 32 soil samples were collected from the soil at a minimum depth of one foot into <br /> the pile using clean, two by six inch brass tubes. The samples tubes were immediately <br /> capped with teflon tape and plastic caps,sealed with duct tape,labeled, and transported cold <br /> under chain of custody to a state certified analytical laboratory. The laboratory composited <br /> every four samples into one for the purpose of analysis. The requested soil analyses were <br /> Extractable Petroleum Hydrocarbons (EPH) as diesel and Total Volatile Hydrocarbons <br /> (TVH) as gasoline using the California DOHS Methods, and Benzene, Toluene, <br /> Ethylbenzene, and Total Xylenes (BTEX) using EPA method 5030/8020. <br /> Analytical results for the composite soil samples analysis showed nondetectable TVI and <br /> BTEX and EPH ranging from 24 to 1,900 milligrams per Kilogram (mg/kg). Certificates <br /> of analyses are attached to this workplan <br /> Based on these analytical results,ESE recommended several remedial options to the owner. <br /> Onsite remediation by enhanced bioremediation methods was selected. Based on this <br /> decision and analytical results to date, additional soil sampling and analysis was performed <br /> on the stockpiled soil. The additional analyses included Title 26 Metals and fish bioassay. <br /> Analytical results for Title 26 metals reported concentrations below regulatory action levels <br /> and the fish bioassay showed nonhazardous concentrations. <br /> Workplan for Onsite Remediation <br /> Enhanced bioremediation utilizes naturally occurring soil microbes to degrade petroleum <br /> hydrocarbons in the soil. ESE proposes the following workplan for remediation for the <br /> stockpiled soil. <br /> The soil will be spread in an approximate one foot lift on 10 mil plastic sheeting in the <br /> adjacent fenced yard. A berm of soil will be created around the spread soil to prevent <br /> runoff during the rainy season. Tap water will be added to the spread soil by a sprinkler <br /> system, to obtain a moisture content of approximately 20 to 30 percent. Nitrogen in the <br /> form of dry Urea will be added to the spread soil at a rate of 20 pounds of nitrogen per 100 <br /> cubic yards of soil. <br /> ...- <br />