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I <br /> I <br /> 2059 Navy, Stockton <br /> Page 2 <br /> TPH-d contamination. Further investigation to determine the vertical and lateral <br /> extent of soil and groundwater contamination must be conducted and the <br /> necessity of remedial action evaluated. <br /> documented at 13,5 feet b <br /> UST <br /> Soli contamination was do sat the time of the 9 <br /> system removal in 1995 so collection and analysis of soil samples below this <br /> depth must be performed to investigate the vertical extent of the soil <br /> e th is shallow and <br /> contamination. Since d to the grab groundwater <br /> groundwater p g . <br /> sample collected on 20 February 2004 had TPH-d contamination, a groundwater <br /> investigation is required. <br /> In addition since the grab water sample indicates that groundwater has been <br /> contaminated a sensitive receptor survey, identifying wells within a 2000 foot <br /> radius of the site, must be conducted. Contact the Department of Water <br /> Resources and search the area to locate the wells. Submit the result of the <br /> survey, which includes a map showing.the location of the identified wells, the <br /> addresses where the wells are located and any known construction details of the <br /> wells to EHD. <br /> B 14 March 2005, lease submit a work Ian to define the vertical and Lateral <br /> Y p p <br /> extent of soil and groundwater contamination caused by the unauthorized <br /> release, and the sensitive receptor survey. <br /> If you have any further questions regarding this matter, contact Harlin Knoll at <br /> (209) 468-3442. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Harlin Knoll, Senior REHS Margare agorEo, <br /> RMS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> cc: CVRWQCB—Jim Barton <br /> cc: SWRCB, Cleanup Fund <br /> cc: H2OGEOL <br /> cc: Ron Barber <br /> i <br />