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f <br /> Civic Center Square 0 <br /> 2444 Main Street Suite 215 <br /> Fresho Celifornia 93721-2734 <br /> (559) 264-2535 e FAX(559] 264-7431 GE®MA RIX <br />' February 5, 2002 <br /> Project 006437 <br />' Mr Jay aR Jhan in <br /> g <br /> Director of Environmental and Regulatory Affairs <br />' Port of Stockton <br /> Post Office Box 2089 <br /> Stockton, California 95201-2089 <br /> Subject Results of Assessment and Recommendations for Further Assessment <br /> Lateral and Vertical Extent of Petroleum Hydrocarbons in Soil and Groundwater <br /> UST Site No 3 (Site Code 1282-124) <br /> Dear Mr Jahangrri <br /> Geomatnx Consultants, Inc (Geomatnx), has conducted a soil and groundwater assessment <br /> on behalf of the Port of Stockton at UST Site No 3 (Figure 1) The intent of the assessment <br /> was to obtain data to assess the lateral and vertical extent of soil and groundwater affected by <br /> petroleum hydrocarbons (PHCs)resulting from a release from former underground storage <br /> tanks (USTs) The assessment was described in Geomatnx's September 11, 2001 Work Plan, <br /> which was approved by the San Joaquin County Public Health Services-Environmental Health <br /> Division (PHS-EHD) on October 3, 2001 The assessment consisted of collecting soil and <br /> discrete-depth groundwater samples at four locations around UST Site No 3 (Figure 2) and <br /> Ianalyzing the samples for PHCs The assessment is described in further detail below <br /> PRE-FIELD ACTIVITIES <br /> Prior to initiating the field work, a well permit/soil boring permit was obtained from PHS- <br /> EHD (Appendix A) The boring locations were selected based on the direction of ground- <br /> water flow and the location of nearby industrial facilities (Figure 2) All drilling sites were <br /> marked and Underground Service Alert, the Port's Maintenance Department, and the tenant <br /> were contacted to clear the sites for drilling <br /> SOIL AND GROUNDWATER ASSESSMENT <br /> The field assessment was conducted on December 20 and 21, 2001, in general accordance <br /> with the following guidance documents <br /> • "Work Plan for Assessing Lateral and Vertical Extent of Petroleum Hydrocarbons <br /> I in Soil and Groundwater, Site No 3 (Site Code 1282-124)" September 11, 2001 <br /> Geomatrix Consultants, Inc <br /> I • "Work Plan for Initial Subsurface Investigation for Petroleum Hydrocarbons, Site <br /> i� Nos 2 and 3 (Site Code 1282-124)," June 30, 1998, Boyajian & Ross <br /> IGe(mma%riJx (Co nsa.n0t a nTs, guico. <br />! Engineers Geologists and Environmental Scientists <br /> I\PROJEC-86437 0001643"-Site3 LatVert Results doe <br />