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U-Haul#709-50 <br /> Additional Site Characterization Blaes Environmental <br /> 2 INTRODUCTION <br /> This report documents the procedures and findings of an additional soil and groundwater site <br /> characterization program conducted at U-Haul Facility #709-50 located at 2701 North Wilson Way in <br />' Stockton, California (Figures 1, 2 and 3) The site characterization program was conducted in January <br /> 2000 by Blaes Environmental Management, Inc (Blaes Environmental) at the request and authorization <br />' of Amerco Real Estate Company/U-Haul International (Amerco/U-Haul) Due to a significant rise in <br /> groundwater elevation (and potential variation of the extent of hydrocarbons in soil and groundwater) <br />' since the original site characterization activities conducted in 1990 and 1993, the San Joaquin County <br /> Public Health Services, Environmental Health Division (PHS-EHD) requested the additional site <br />' investigation activities <br />' I I WORK PLAN PREPARATION <br /> Prior to conducting on-site characterization activities, Blaes Environmental prepared a work plan at the <br />' request of Mr Michael Infuina of the PHS-EHD (Blaes Environmental, 1999b) The work planP rovided a <br /> description of planned activities associated with characterization of petroleum hydrocarbons in soil and <br /> groundwater at the site Mr Infurna indicated that further charactenzation of hydrocarbon impacted soil was <br /> necessary at depths greater than 70 feet below ground surface (bgs) Since the original site characterization <br /> activities performed in 1990, the groundwater level has risen from approximately 80 feet bgs to 45 feet bgs <br /> and it is possible that 1) the extent of hydrocarbons in soil is greater than 75 feet bgs (the depth of previous <br /> investigations) and 2) the extent of hydrocarbons in groundwater has changed in the last four years The <br /> work plan described planned soil sampling activities both above and beneath the groundwater surface and <br /> the installation of eight new monitoring wells <br /> 12 J!ROGEAM QBLELTIVES <br /> The general objective of the program was to supplement previous site characterization data to complete the <br /> evaluation of the lateral and vertical extent of petroleum hydrocarbons in soil and groundwater at the site <br /> The site specific program objectives were to <br /> I) Evaluate the vertical and lateral extent of hydrocarbons in soil below the depth of previous <br /> investigations(70 to 75 feet bgs), <br /> 2) Install new groundwater monitor wells screened across the current static groundwater interface, <br /> 1 <br />