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o '• OneCreek Center <br /> 100 PringleIngle Avenue • Woodwarl Clyde Consultants <br /> Walnut Creek.CA 94596 <br /> 415-945-3000 <br /> August 13, 1985 <br /> 90156A/0002 <br /> Mr. Ron Quick <br /> LOF Glass <br /> 500 East Louise Avenue <br /> Lathrop, CA 95330 <br /> Dear Ron: <br /> On July 25 you requested that Woodward-Clyde make recommendations <br /> regarding the land spreading of approximately 200 yards of soil con- <br /> taminated by a recent oil leak at your plant. We have considered the <br /> possibility for land treatment and believe that this is an excellent <br /> alternative. <br /> According to your letter, there are 200 yards of soil contaminated with <br /> approximately 34,000 ppm of oil. This oil contains approximately 39 ppm <br /> Pb, 800 ppm Zn and several other heavy metals at low concentrations. <br /> Given that the oil is mixed into approximately 200 yards of soil, the <br /> resulting concentrations in the waste are approximately 27 ppm Zn and <br /> 1.3 ppm Pb, assuming a soil bulk density of 1.5 g/cm3. These concentra- <br /> tions are well below the STLC values which would require that the soil be <br /> handled as a hazardous Zn or Pb waste (250 and 5 ppm respectively). <br /> Since the waste is not hazardous, you should be able to treat it on site <br /> with no difficulty. We suggest that the oily soil be spread over the <br /> 2.3 acre area indicated in your letter. Spread evenly over this area, <br /> the resulting oily waste thickness will be roughly one half inch. The <br /> waste should then be incorporated into the 2.3 acre area. Incorporation <br /> into the soil will accelerate the breakdown of the oil by increasing <br /> contact with soil microbes. A conservative oil breakdown rate is 0.2% of <br /> the affected soil weight each month (Overcash and Pal, 1979) . Therefore, <br /> the quantity of oil degraded in the first month would be 5300 roughly <br /> kg. since the total quantity of oil is roughly 7800 kg, the oil should <br /> be degraded within a one to two month period. <br /> Further acceleration of the decomposition rate can be achieved by the <br /> addition of fertilizers. The presence of 50 ppm N and 20 ppm P is <br /> thought to be sufficient for microbes to achieve their maximum growth <br /> rates in oily substrates. Therefore, we suggest the incorporation of <br /> Consulting Engineers.Geologists <br /> and Environmental Scientists ACk <br /> Offices in Other Principal Cities 1W <br />