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1 <br />' QLARTERLY GROUNllWATFR MONITORING REPORT <br /> • THIRD QUARTER, 2000 <br />' Herman & Helen's Marina <br /> Venice Island Ferry <br /> Stockton, CA <br />' October 17, 2000 <br />' 1 INTRODU( TION <br /> On Scptembei 7 2000 ( ondor I arch 1 eclnnologics Inc (( ondor) conducted quarterly groundwater and surface <br />' watLr monitoring at Ilerman & llclen's Marina located at Venice Island 1-erry in Stockton, California (I figures l <br /> and 2, Appendix A) flee work described in this report was conducted in accordance with sampling procedures <br /> included in the Work Plan - iilfonitor Well Installation and the Work Plan Addendum, prepared by Condor and <br /> dated May 30, 1997 and July 9, 1998, respectively The work plan was conditionally approved by Mr Ronald <br /> Rowe of the San Joaquin County Public Health Services/Environmental Health Department (PHS/F11D) in <br /> correspondence dated July S 1997 The work plan addendum was approved by Mr Rowe in correspondence <br /> dated July 27 1998 rhe third quarter, 2000, monitoring described in this report is the twelfth quarterly <br /> groundwater monitoring event and the ninth surface water sampling event to be conducted at the site This report <br /> was prepared at the request of Mr Andrew Smith of Herman & Helen's Marina <br /> The groundwater and surface water samples collected during the third quarter, 2000 monitoring event were <br /> laboratory analyzed for benzene, toluene, ethyl benzene and total xylenes (BTEX), total petroleum hydrocarbons <br /> • quantified as gasoline (7 PH-G), and selected gasoline oxygenates/additives phis report includes site <br /> background information a summary of the current monitoring ivc,nt (including a description of the, sampling and <br /> laboratory analytical results), and a summary with conclusions <br /> 2 SITE BACKGROUND <br /> On October 30, 1991 Warren E Goines Excavating, Inc , of Rio Vista, California, excavated and removed three <br /> underground storage tanks (USTs) from the site (figure 2, Appendix A) The USTs (TKI, TK2, and TK3) <br /> contained gasoline and diesel fuel A small hole was found on the lower fill end of TK3 (diesel tank) Petroleum <br /> staining and odors were noted in the soil beneath the former locations of the USTs Six soil Samples were <br /> collected by Condor from the UST excavation at depths of 9 to 12 feet below the ground surface Laboratory <br /> analyses indicated elevated concentrations of TPH-G, BTEX, and total extractable petroleum hydrocarbons <br /> quantified as diesel (TLPII) in the soil samples <br /> IOn August 22 1995, three hydropunch borings were drilled at the site Gasoline odors were noted in each <br /> borehole Laboratory analyses indicated the presence of TPH-G and BTEX in the soil and groundwater samples <br /> analyzed from each borehole Based on the results of the August 1995, investigation, Condor recommended <br /> additional investigation be conducted to evaluate the extent of the hydrocarbon plume On August 29, 1996, five <br /> Geoprobe boreholes were installed at the site The results of the laboratory analyses indicated that elevated <br />' concentrations of I PI I-6, B FFX, and inethyl tertiary butyl ether (MTBE) were present in soil and groundwater <br /> samples collected fi orn the northern portion of the site and that further investigation was necessary to evaluate <br /> the extent of soil and groundwater contamination <br />' Based on the results of the Geoprobe investigation, Condor recommended that monitor wells be installed at the <br /> site to investigate and monitor the lateral extent of the gasoline and diesel contamination plume in the <br /> groundwater On September 10, 1997, Condor installed four monitor wells at the site The Report - Additional <br /> IL� LONDOR <br />