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Chevron <br /> Chevron U.S.A. Inc. <br /> 2410 Camino Ramon, San Ramon, California•Phone(415) 842-9500 <br /> Mail Address:P.O.Box 5004,San Ramon,CA 94583-0804 <br /> Marketing Department <br /> May 2, 1991 <br /> Ms. Margaret Lagorio <br /> San Joaquin County Environmental Health '� <br /> P.O. Box 2009' <br /> Stockton, CA 95201 <br /> MAY 8 � <br /> Re: Chevron S.S. # 9-4275 ENVIRONMENTAL HEALTHFERMI IT/SERVICES <br /> 2905 West Benjamin Holt Drive, Stockton, CA <br /> Dear Ms. Lagorio: <br /> Enclosed is a report dated March 8, 1991 which was prepared by Chevron's consultant, Alton <br /> Geoscience, to describe groundwater monitoring which occurred on January 17, 1991 at the site <br /> referenced above. <br /> -Groundwater gradient direction and levels of dissolved-phase hydrocarbons were consistent with <br /> previous observations at this site. <br /> As you know, BAT probes were installed adjacent to each of the five wells on March 11 and 12, <br /> 1991. I have received preliminary verbal results from Earth Technology which indicate a lower <br /> level of volatile hydrocarbons present in the water samples collected from the BAT probes than <br /> those collected from the monitoring wells. Earth Technology is proposing a lab study to determine <br /> whether the lower levels are due to headspace volatilization induced by the vacuum sampling <br /> methodology. As results become available,I will certainly pass the information along to you. <br /> If you have any questions or comments, please contact me at(415) 842-8658. <br /> Sincerely, <br /> Clint B. Rogers <br /> Environmental Engineer <br /> Enclosure <br /> cc: Jim Maughan, Central Valley RWQCB, Sacramento,CA <br /> Kyle Christy, ARCO Products Co., P.O. Box 5811, San Mateo, CA 94403 <br /> Sandra Lindsey, Groundwater Technology Inc., Concord, CA <br />