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1 . 0 INTRODUCTION <br /> This report outlines the methods and findings of Aqua Science Engineers, <br /> Inc. (ASE)'s soil and groundwater assessment at the Hanson property <br /> located at 7750 Schulte Road in Tracy, California (Figure 1). The site <br /> assessment activities were initiated by Ms. Maxine Hanson of the Hanson <br /> Family Partnership, owner of the property, and Charter Properties, a <br /> potential buyer of the property, to meet the requirements of the San <br /> Joaquin County Public Health Services, Environmental Health Division <br /> (SJCPHS-EHD) for case closure of a underground storage tank formerly <br /> located at the site. <br /> 2 . 0 SCOPE OF WORK (SOW) <br /> ASE's scope of work for this project was to: <br /> 1 ) Prepare a workplan for approval by the SJCPHS-EHD. <br /> 2) Obtain a drilling permit from the SJCPHS-EHD. <br /> 3) Drill one soil boring at the site directly through the location of the <br /> former UST using a Geoprobe drill rig. Prepare soil samples for <br /> analysis every 5-feet as drilling progresses starting at a depth of 8 - <br /> feet below ground surface (bgs). <br /> 4) Analyze the soil samples collected from 8-feet bgs, 13-feet bgs a n d <br /> 18-feet bgs for total petroleum hydrocarbons as gasoline (TPH-G) by <br /> EPA Method 5030/8015M, total petroleum hydrocarbons as diesel <br /> (TPH-D) by EPA Method 3510/8015M, benzene, toluene, ethylbenzene, <br /> and total xylenes (collectively known as BTEX) by EPA Method 8020 <br /> and fuel oxygenates by EPA Method 8260. In addition, one soil <br /> sample chosen by Mr. Michael Infurna of the SJCPHS-EHD was also <br /> analyzed for methanol and ethanol by EPA Method 8015M direct <br /> injection. <br /> 5) Collect groundwater samples from the boring. <br /> 6) Analyze the groundwater samples for TPH-G by EPA Method <br /> 5030/8015M, TPH-D by EPA Method 3510/8015M, BTEX by EPA <br /> Method 8020, fuel oxygenates by EPA Method 8260 and methanol a n d <br /> ethanol by EPA Method 8015M direct injection. <br /> 7) Backfill the boring with neat cement. <br /> Hanson Property Report - August 1998 <br /> -1- <br />