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r <br /> n " <br /> Chevron <br /> Chevron <br /> i <br /> Chevron U S A Products Company <br /> 6001 Bollinger Canyon Road <br /> August 5, 1996 Building L <br /> San Raman CA 94583 <br /> PO Box 5004 <br /> San Ramon CA 94583-0804 <br /> Mr Ron Rowe Marketing—Northwest Region <br /> San Joaquin County Public Health Services Phone 510 842 9500 <br /> P O Box 388 <br /> Stockton, CA 95201-0388 <br /> Re Chevron Station# 9-1452, 334 E Main St,Ripon, CA <br /> Attached Soil and Groundwater Investigation Report(Pacific, 516196) <br /> Dear Mr Rowe <br /> Attached you will find a report dated May 6, 1996, which was prepared by Chevron's consultant,Pacific <br /> Environmental Group, Inc (Pacific), to describe the results of a subsurface soil and groundwater <br /> investigation that was performed at the subject site on January 10 - 11, 1996 <br /> • During their investigation,Pacific drlled and sampled eight soil borings Soil samples were analyzed for <br /> the presence of TPHGas, BTEX constituents, TPHDiesel, and MTBE Four of the eight soil borings were <br /> completed as groundwater monitoring wells Groundwater samples were collected from each and were <br /> analyzed for the same suite of analytes as the soil samples <br /> The results of Pacific's soil sampling indicated detections of hydrocarbons within the diesel range at I l <br /> feet below grade and at 16 feet below grade at boring B-2 and well MW-4, respectively These detections <br /> were at or slightly above the method detection limit(1 0 ppm) There was also 0 18 ppm MTBE measured <br /> at 11 feet below grade from boring B-1 There were no other petroleum hydrocarbons detected in soil <br /> during Pacific's investigation In addition, there were no detections of petroleum hydrocarbons measured <br /> in groundwater beneath the site The measured direction of groundwater flow was toward the southwest <br /> Depth to groundwater was approximately 30 0 feet below the top of well casings <br /> The groundwater monitoring wells at the subject site have been included in a regular monitoring and <br /> sampling program If you have any questions or comments, please contact me at(510) 842-8695 <br /> Sincerely, ,Q / <br /> If 41 <br /> t)A.4/v h <br /> Z?t- <br /> Brett L Hunter <br /> Environmental Engineer <br /> • Site Assessment and Remediation <br /> Attachment <br />