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Chevron ' <br /> Chevron U.S.A. Inc. <br /> 2410 Camino Ramon, San Ramon, California•Phone 14151842-9500 <br /> Mail Address:P0.Boz 50[14,San Ramon,CA 94583-0804 <br /> Marketing Department <br /> i <br /> September 30, 1991 <br /> Ms. Linda Turkatte <br /> San Joaquin County Environmental Health , �- <br /> P.O. Box 2009 <br /> 0 C T ' i "I <br /> Stockton CA 95201 <br /> ENV I RON W. <br /> PF--RMI I'� ; �Ed10ES <br /> Re: Chevron Station#9-6465 <br /> 5608 North Pershing Avenue, Stockton, CA <br /> Dear Ms. Turkatte: <br /> Enclosed is a report dated-September 3, 1991 which describes groundwater monitoring by <br /> Chevron's consultant, Alton Geoscience, on July 21, 1991 at the site referenced above. <br /> Groundwater gradient direction was consistent with previous observations at the site. Of the seven <br /> groundwater monitoring wells with sufficient water to sample, only well MW-2A contained a <br /> detectable level of benzene(0.8 parts per billion). <br /> Bearing in mind the extremely low level of hydrocarbons present in the groundwater beneath this <br /> site, I would ask that you reconsider the position <br /> taken in the letter Y p r from your office to me dated <br /> -June 24, 1991. This letter requested a quarterly groundwater monitoring frequency rather than the <br /> semi-annual frequency which I had proposed in my letter.of April 18, 1991. I would appreciate <br /> your consideration of this sample frequency reduction request, and I will not enact a frequency <br /> change until gaining your approval. I look forward to your timely response. <br /> If you have any questions or comments, please contact me at(510) 842-8658. <br /> Sincerely, <br /> Clint B: Rogers <br /> rs <br /> Environmental Engineer ! <br /> -Enclosure <br /> cc: Elizabeth Thayer, Central Valley Regional,Water Quality Control Board, Sacramento ,CA <br /> A.G. Spanos Properties, Inc., 1241 W. Robinwood Dr., Stockton, CA 94207 ! <br /> John DeGeorge, Alton Geoscience, Concord, CA(w/o enclosure) <br /> i <br />