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' Dimond Lumber.Manteca Drum Disposal Page 2 <br /> Detection Limits <br /> Volatile Hydrocarbons 50 ppb (during Jan 1990, Oct 1991, Nov 1991, and April 1992 sampling events) <br /> 0 02 ppb(during Aug 1992 sampling event) <br /> ' Benzene 0 5 ppb <br /> Toluene 0 5 ppb <br /> Ethylbenzenc 05 ppb <br /> Xylenes 05 ppb <br /> Lead 5 ppb (during Nov 1991 & April 1992 sampling events) <br /> 1 ppb (during Oct 1992 and Aug 1992 sampling events) <br /> Organic and inorganic analyses were performed by California certified laboratories in accordance with <br /> PHSIEHD guidelines Pursuant to your request, copies of the analytical data and chain-of-custody are <br /> ' enclosed <br /> On behalf of our client, SRK requests permission to dispose of the six 55-gallon drums of non- <br /> hazardous water into the City of Manteca public sewer system during the upcoming quarterly <br /> monitoring event scheduled for February 4 and 5, 1993 Please contact me or Rob Cn ilym at your <br /> earliest convenience <br /> With regards, <br /> ' STEFFEN ROBERTSON AND KIRSTEN (U S ) INC <br /> Rob Gwilym, C P G <br /> Pnncipal, Senior Environmental Geoscientist <br /> David Schwieger <br /> Environmental Hydrogeologist <br /> DS/sal <br /> Enclosures <br /> ' cc Ann Arney - 650 Management Corporation <br /> 1 <br /> ' auw avis—0]l Steffen Robertson and KIISten <br />