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Chevron <br /> Chevron U.S.A. Inc. <br /> 2410'Camino Ramon, San Ramon;California•Phone 14151842-9500 <br /> wo Mail Address:P.O.Box 5004,San Ramon,CA 94583-0804 <br /> Marketing Department <br /> May 30, 1991 <br /> Mr. Steve Schneider <br /> San Joaquin County Environmental Health <br /> P.O. Box 2009 <br /> Stockton, CA 95201 � o- �.y <br /> Re: Chevron S.S. #9-0557 <br /> 139 South Center Street, Stockton, CA J U N 5 � <br /> Dear Mr. Schneider: ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Enclosed is a report dated April, 1991 which was prepared by Chevron's consultant, Groundwater <br /> Technology, Inc. (GTI), to describe the installation of four groundwater monitoring wells at the <br /> site referenced above. The wells were drilled in February 1991 and groundwater monitoring was <br /> performed in March 1991. <br /> No hydrocarbons were detected in any of the soil samples collected during the drilling. Dissolved <br /> IL h ydrocarbons were detected in the two wells located on the south end of the site near the former <br /> F tunderground gasoline storage tanks. <br /> It should be noted that the groundwater gradient has a relatively small magnitude across the site. <br /> Rather than immediately installing addit onal_wells_-to-further-define the extent of dissolved <br /> hydrocarbons in the groundwater, propose that a program of quarterly monitoring be followed <br /> for three quarters prior to selecting the-location-of additional Wells.This will-allow for a better <br /> understanding of the groundwater flow direction over the cycle of one year. Due to the small <br /> magnitude of the groundwater gradient, the flow direction may vary over time. Without a large <br /> gradient, the dissolved hydrocarbon plume will probably not migrate significantly during this <br /> period of collecting data. The information gathered during such a time frame may greatly aid in the <br /> proper placement of additional wells. <br /> i <br /> I have instructed GTI to monitor the wells again in June 1991. I will send a copy of the results to <br /> your attention. <br /> If you have any questions or comments,you may contact me at(415) 842-8658. <br /> Sincerely, <br /> Clint B. Rogers <br /> I <br /> Environmental Engineer <br /> Enclosure <br /> cc: Jim Maughan, Central Valley RWQCB, Sacramento, CA <br /> Van Hartnitt, Greyhound Lines, 901 Main St., Suite 2400, Dallas, TX 75202 <br /> Sandra Lindsey, GTI, Concord, CA <br />