Laserfiche WebLink
:' FMA <br /> Working To Restore Nature <br /> FIRST QUARTER 1994 <br /> ' GROUNDWATER MONITORING REPORT <br /> ' Former Thiemann's Service <br /> Ripon, California <br /> ' <br /> INTRODUCTION <br /> O UCTION <br /> This report presents the results of quarterly groundwater monitoring and sampling performed in <br /> March 1994 by RESNA Industries Inc (RFSNA) at Former Thiemann's Service The site is <br /> located at 106 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 /> i <br /> BACKGROUND <br />' In March 1991, three underground storage tanks (USTs) were removed from the site Analysts <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 />' 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 /> 1 completed as shallow groundwater monitoring wells (MW-1, MW-2 and MW-3) Analysis of <br /> t 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 />' 15007$1QUARTLYIIQR-1994 FNL 1 <br />