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Umran <br /> =Chevron <br /> Z_1 L,.C 2 <br /> Chevron U 5 A Products Company <br /> 6001 Bollinger Canyon Road <br /> Building L <br /> San Ramon CA 94583 <br /> PO Box 5004 <br /> San Ramon CA 94583-0804 <br /> December 27, 1995 <br /> Marketing—Northwest Region <br /> Phone 510 842 9500 <br /> Mr Harlin Knott <br /> San Joaquin County Public Health Services <br /> P O Box 388 <br /> Stockton,CA 95201-0388 <br /> Re Former Chevron Station#9-8632,575 Grantlme Rd_,_Tracy, CA <br /> Attached Groundwater Momtonng Reports(Blaine Tech, 10/3/95, 12/22/95) <br /> Dear Mr Knoll <br /> Please find attached two reports dated October 3, 1995 and December 22, 1995 which were prepared by <br /> Chevron's consultant,Blaine Tech Services(Blaine Tech),to describe results of groundwater monitoring <br /> that was performed at the subject site on September 7, 1995 and December 1, 1995, respectively <br /> During both monitoring events,Blaine Tech gauged and sampled all four site-related wells All samples <br /> collected were analyzed for the presence of TPHGas,TPHDiesel,and BTEX constituents In addition, <br /> samples collected from well MW-I were analyzed for total oil and grease <br /> In September,the measured direction of groundwater flow was toward the northwest Dissolved petroleum <br /> hydrocarbons were detected at each well The concentrations of TPHGas and TPHDiesel were highest at <br /> well MW-4 The laboratory reported an unidentified hydrocarbon pattern within the diesel analysis <br /> The results from the December site monitoring event indicated that groundwater was again,flowing <br /> northwesterly beneath the subject site Dissolved petroleum hydrocarbons were detected at each well <br /> Except for wells MW-2 and MW-3,the concentrations were consistent with those measured previously <br /> The measured concentrations at wells MW-2 and MW-3 were greater than those measured during the <br /> previous quarter <br /> The next phase of work will be directed at defining the extent of the dissolved hydrocarbon plume A <br /> workplan describing this work will be submitted to your agency by February 15, 1995 If you have any <br /> questions or comments,please contact me at(510) 842-8695 <br />`�� Sincerely, <br />