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1S /1�� Wright <br /> Environmental <br /> Services, Inc. <br /> Construction ♦ Engineering • Remediation <br /> April 7, 2003 - OR YE D <br /> Project No 4889 <br /> APR 1 6 2003 <br /> City of Tracy ENVIRONMENT HEALTH <br /> 3900 Holly Drive PERMIT'/SERVICES <br /> Tracy, Califorma 95376 <br /> Attn Mr Paul Verma <br /> Re: Soil and Groundwater Initial Site Assessment <br /> City of Tracy Wastewater Plant, 3900 Holly Drive, Tracy, CA <br /> PHS EHD Site Code#2330 <br /> Dear Mr Verma, <br /> Wnght Environmental Services, Inc (Wright) has prepared this report on behalf of City of Tracy <br /> (property owner) for the above referenced site This work is in response to letters dated <br /> September 29, 2001 and October 5, 2001 from the San Joaquin Public Health Services <br /> Environmental Health Division (PHS EHD) for additional site assessment This work is being <br /> done to address possible contaminants from an underground diesel fuel storage tank that was <br /> formerly on the site and to check for presence of MTBE and related fuel oxygenates <br /> Background <br /> One underground storage tank containing diesel fuel for a backup generator was removed from <br /> the site in January 1998 under PHS EHD permits Soil and groundwater samples collected as a <br /> part of the tank removal revealed Total Petroleum Hydrocarbons as Diesel in soil at II <br /> milligrams per kilogram (mg/kg) and 580 milligrams per liter (mg/1) in groundwater On the <br /> basis of this data, PHS EHD requested additional site investigation One surface diesel storage <br /> tank is located adjacent to the former tank pit The former tank pit is located within the <br /> Wastewater plant operation between several Iarge sludge drying ponds and wastewater storage of <br /> treatment ponds <br /> Field Methods <br /> Exploratory Borngs <br /> Four exploratory borings were drilled at the locations shown on Figure I Drilling permits were <br /> secured from PHS EHD, and a utility clearance was performed prior to doing the fieldwork The <br /> boreholes were dulled with GeoProbe truck mounted drilling equipment Bonng locations were <br /> adjusted in the field due the proximity of numerous subsurface utilities <br /> 67 E 10th Street • Tracy, CA 95376 <br /> 209 833 0758 . Fax 209 832 5152 Page 1 of 6 <br /> wrrght@:preach com Lic 4651501 A-B Ha Mat <br /> webstl hup 11home tnreach com/wrtght i~, <br />