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d Quik Stop Market No 76 October 28, 2003 <br /> Stockton California Results of Additional Groundwater Invests ation <br /> In May 2002, soil borings SB-1, SB-2 and SB-3 were advanced at the locations shown on <br /> • Figure 2 Soil and hydropunch groundwater samples were collected to evaluate the extent of <br /> petroleum hydrocarbons in soil and groundwater Soil and groundwater analytical data are <br /> summarized in Tables 1 and 2 Horizon documented the investigation in Results of Soil and <br /> Groundwater Investigation dated June 25, 2002 <br /> ADDITIONAL GROUNDWATER INVESTIGATION <br /> Fieldwork for this investigation consisted of the installation of monitoring well MW-1, and a <br /> sensitive receptor survey Monitoring well MW-I was located in the down-gradient <br /> direction (as indicated by SJCEHD) approximately 10 feet from soil boring SB-2 The <br /> hydropunch groundwater sample collected from soil boring SB-2 was reported to contain the <br /> highest petroleum hydrocarbon concentrations of the three hydropunch samples All <br /> fieldwork was conducted in accordance with Horizon Field Methods and Procedures <br /> contained in Appendix B <br /> Monitoring Well Installation <br /> Gregg Drilling (C57-license No 485165) of Martinez, California was retained to provide <br /> drilling and sampling services Horizon obtained well permit SR# 0034321 from the <br /> SJCEHD (Appendix A) to allow the installation of a monitoring well Underground Service <br /> Alert (USA) was notified to locate and mark underground utilities adjacent to the site <br /> On July 3, 2003, one 8-inch diameter soil boring was advanced to 75 feet utilizing a hollow- <br /> stem auger drilling rig at the location shown on Figure 2 Soil samples were collected from <br /> the borings at five-foot intervals beginning at 5 feet bsg and field screened for the presence <br /> of volatile petroleum hydrocarbon vapors with a portable photo-ionization detector (PID) <br /> Soil descriptions, sampling information, field-screening data and well construction details <br /> were recorded on a soil boring log (Appendix C) Soils were described using the Unified <br /> Soil Classification System (USCS) Soil cuttings were stockpiled at the site on and covered <br /> 076AddGWmvestgtn10-03 doc 3 <br /> Project No 7079 14 HORIZON ENVIRONMENTAL <br />