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03/23/93 08:43 LOF GLASS LATHROP 002 <br /> A-HA81COGNT <br /> One Wainui GfeeK Center <br /> Woodward-Clyde Consultants <br /> 100 Pringle Avenue <br /> walnut Creek.CA 94596 <br /> 415-945-3000 <br /> August 13, 1985 <br /> MAR 2 9 12"33 <br /> 90156A/0002 <br /> ENVIRONMENTAL HEALI-H <br /> PERMIT/SE N 1 C <br /> Mr. Ron Ql.1jCk <br /> LOF Glass <br /> 500 East Louise Avenue <br /> Lathrop, CA 95330 <br /> Dear Pon: <br /> On July 25 you requested that Woodward-Clyde make recommendations <br /> regarding the land spreading of approximately 200 yards Of 5011 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 /> smaEnvironmentat9ciennsts <br /> Offices in Other Principal Cities <br /> MAR 23 '93 11:40 209 858 2024 PAGE.002 <br />