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1 2v <br /> G'ave�ra�tt <br /> Environmental Compliance Consulting <br /> QVERVIEW <br /> Three underground tanks were removed; one 1000 gallon gasoline tank in April, <br /> and two diesel tanks (one 5000 gallon capacity, the other 10,000 gallon cap.) <br /> removed in June. The diesel tanks showed absolutely no evidence of perimeter <br /> soil contamination. The gasoline tank soil showed positive on the north (fill) <br /> end only from two 'separate' laboratories. This soil from the gas tank <br /> excavation is spread on and covered by 'poly'sheeting on the far east borer <br /> � I.- '` <br /> of the property, ft's total volume approximately 10 yd3. <br /> This original stockpile of sail and all existing excavations and Ves were <br /> again sampled by Greg Reed of universal Engineering [witnessed by Darlene Reuss] <br /> on 10 January 1990 and transported to Precision Analytical Lab in Richmond. <br /> The maximum contamination from all areas was indicated in the 'original' <br /> soil stockpile where gasoline showed 90 mg/kg and diesel at 140 mg/kg. <br /> -"r This evident cross—contamination of diesel in the original stockpile most <br /> likely resulted from the 'front end' loader which transferred the soil from <br /> the excavation to the stockpile. <br /> REMEDIAT10N PROCEDURES <br /> been applied for to the San Joaquin County Air Pollution <br /> Alpermitto aerate has <br /> Control District. The soil will be spread on 'poly sheeting' and turned <br /> The covered soil, in the interim will be subject <br /> daily , as weather permits. <br /> to normal soil bacteria and fungi which break down the larger(12 to 14 carbon <br /> The soil will be resampled and <br /> chains) semivolatile fragments of diesel. <br /> analyzed as necessary until contaminant levels are below action limits. <br /> g will occur after notification to San Joaquin County Environmental <br /> Resamplin <br /> has there been in the past, <br /> Health Department. There is not presently, nor <br /> any imminent danger to groundwater. Groundwater was not present during all <br /> excavation procedures and all contaminated soils removed are on and covered <br /> with impermeable poly sheeting. <br /> Page 3 <br />