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s <br /> SUTH <br /> ENVIRON !ENTALTECHNOLOGIES CORPORATION <br /> May 13, 1996 <br /> 94373 <br /> Ms Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, California 95201-0388 <br /> Subject Monitoring Report Second Quarter 1996, Former Thiemann's Service Station, 106 <br /> West Second Street, Ripon, California <br /> Dear Ms Meays <br /> This report presents the results of quarterly groundwater monitoring and sampling performed in <br /> April 1996 by Smith Environmental Technologies Corporation at Former Thiemann's Service <br /> The site is located at 106 West Second Street in Ripon, California (Figure 1) Sampling was <br /> performed to monitor the distribution of petroleum hydrocarbons in groundwater at the site <br /> Monitoring was performed to determine the groundwater flow direction and the hydraulic <br /> gradient in the uppermost aquifer <br /> SITE HISTORY <br /> In March 1991, three underground storage tanks (USTs)were removed from the site Analysis of <br /> 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 Figure 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 This <br /> included drilling eight soil borings and collecting soil samples Three of these bonngs were <br /> completed as shallow groundwater monitoring wells (MW-1, MW-2 and MW-3) Analysis of soil <br /> samples indicated that the majority of petroleum hydrocarbons in soil were present from about 10 <br /> feet below ground surface (bgs) to groundwater at a depth of approximately 29 feet bgs and <br /> within a radius of 35 feet from the former UST pit <br /> w 1943731quaet1yl2gr-1996 doc 1 <br /> 1260 Graphics Drive Modesto,CA 95351-1502 (209)579-2221 Fax(209)579-2225 <br /> Engineering Consulteng Remediation Construction <br />