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x� <br /> WESTERN 1386 EAST BEAMER STREET <br /> WOODLAND CA 957766003 <br /> .. <br /> WHO - GEO-ENGINEERS (530) 668-5300, <br /> CALIF CONTRACTOR#513857 FAX(530)662-0273 , <br /> REGISTERED GEOLOGISTS wege@mothercom <br /> FROM GEORGE CONVERSE DATE: May 51.2001 <br /> TO- Michael Infurna FAX #: (209) 464-0138 <br /> (209) 468-34.54 <br /> TOTAL PAGES <br /> INCLUDING THIS PAGE <br /> 21 <br /> COMMENTS R604, 1448 N. EL DORADO STREET FILE REVIEW FOR <br /> MTBE PRESENCE. <br /> Mike I reviewed influent vapor samples obtained between January 10 and November 23, <br /> 1994 for evidence of MTBE and found none These results are from the WEGE <br /> chromatograph (Schimadzu FID) that was designed for WEGE for BTEX and TPHg <br /> analysis Examples of MTBE run on this instrument from samples obtained from a Bay <br /> Area site show MTBE has a retention time (RT) of 174 to 176 on our gas <br /> chromatograph see pages 12-20. <br /> I also located groundwater sample results that Superior Laboratory indicated an unknown <br /> single peak in MW2 sample We resampled this well and had Superior identify this peak <br /> Superior used EPA method 8240 and qualified this compound as 1,2 Dichloroethane <br /> WEGE also had Superior run 8240 identifications on vapor samples obtained from MW2 <br /> and the influent of the vapor extraction system - no MTBE was indicated See pages 1- <br /> 11. <br /> Review of the groundwater flow direction for these site shows that the groundwater flows <br /> predominately to the east with occasional flows to the northeast and west This site was <br /> investigated to 60 feet below surface where all samples were below laboratory lower <br /> detection limits for TPHg, BTEX It is highly unlikely that the MTBE UNOCAL <br /> discovered in groundwater samples from the 80 foot depth of their site is related to the <br /> Wickland site Please let me know if I can be of further assistance to you in this matter <br /> Sincerely, <br /> George Converse <br /> Project Geologist <br /> Cc John Margow f, Wickland Properties <br /> 1 <br />