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1117 Lone Palm, Suite B <br /> Modesto, California 95351 <br /> www.atc-enviro.com <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> A S S O C I A T E S I N C . <br /> I <br /> I <br /> February 14, 2002 FEB 15 2002 - <br /> 1 <br /> ENVIRONMENT HEALTH <br /> Ms. Margaret Lagorio PERMIT/SERVICES <br /> San Joaquin County <br /> Public Health Services, EHD <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> I <br /> Subject: Workplan for Groundwater Extraction Testing at Former Thiemann's Service, 106 <br /> West Second Street, Ripon, California <br /> Dear Ms. Lagorio: <br /> INTRODUCTION <br /> ATC Associates Inc. has prepared this workplan to implement a feasibility study and to continue <br /> the groundwater investigation at the above referenced site(Figure 1). J <br /> The proposed scope of work contained in this workplan is based on telephone discussions with <br /> Margaret Lagorio of the San Joaquin County Public Health Services Environmental Health <br /> Division (PHS/EHD) in 2001. a <br /> BACKGROUND <br /> Site Location <br /> The project site is located at 106 West Second Street, Ripon, California. The site location, is <br /> shown on Figure 1. The site is located in a residential/commercial area in Ripon. <br /> Previous Work <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 borings 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 /> W:\62605\REPORTS\WPPUMP.DOC 1 i <br /> i <br />