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1 <br /> Working To Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 SECOND QUARTER 1994 <br /> FAX (209) 838-3509 GROUNDWATER MONITORING REPORT <br /> ' Former Thiemann's Service <br /> Ripon, California <br /> INTRODUCTION <br /> This report presents the results of quarterly groundwater monitoring and sampling performed in <br /> June 1994 by RESNA Industries Inc. (RESNA) at Former Thlemann's Service. The site is <br /> located at 105 West Second Street in Ripon, California (Plate 1). Sampling was performed to <br /> monitor the distribution of petroleum hydrocarbons in groundwater at the site Monitoring was <br /> performed to determine the groundwater flow direction and the hydraulic gradient in the <br /> uppermost aquifer. <br /> iJ <br /> BACKGROUND <br /> In March 1991, three underground storage tanks (USTs) were removed from the site Analysis <br /> of soil samples collected from the excavation indicated that high concentrations of petroleum <br /> ' hydrocarbons were present in soil beneath the tanks. Groundwater was not encountered in the <br /> excavation. The location of the former USTs is shown on Plate 2. <br /> In July 1993, a subsurface investigation was conducted at the site to determine the extent of <br /> 1 petroleum hydrocarbons present in soil and to determine if groundwater had been impacted <br /> This included drilling eight soil borings and collecting soil samples. Three of these borings were <br /> completed as shallow groundwater monitoring wells (MW-1, MW-2 and MW-3) Analysis of <br /> soil samples indicated that the majority of petroleum hydrocarbons in soil were present from <br /> about 10 feet below ground surface (bgs) to groundwater at a depth of approximately 29 feet bgs <br /> ' and within a radius of 35 feet from the former UST pit <br /> ' 1500781QUARTLYI2QR-1994 FNL 1 <br />