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Qt zkRTLRI Y GROLNDWA rFR MONITORING REPORT SECOND QUARTER, 2000 Herman & Helen's Marina Venice Island Ferri Stockton, C -k ' Iuly 31, 2000 1 INTRODUCTION 011 June. 21 2000 C ondor I arch I cchnologlcs Inc (( ondor) conducted quarterly groundwater and surface water monitoring at kicrman & licicn s Marina located it Vcntce Island I-erry In Stockton ( alitornia (I tgures l and 2 Appendix I he work dcscr:bed in this icport wa, conducted In accordance with sampling procedures included In the f!'w k Plim Wonam We/1 histullumm and the Work Plum l ddenditin prepared by C ondor and dated May 30, 1997 and July 9 1996 respective.ly I he work plan was conditionally approved by Mr Ronald Kowe of the San Joaquin County Public Health 5crvlecs/t nNironmental Health DepartrnLnt (PHS/Efil)) in correspondence datc,d July 8 1997 Flee work plan addendum was approved by Mr Rowe in correspondence dated July 27, 1998 The Second quarter, 2000 monitoring described in this report is the eleventh quarterly groundwater monitoring event and the eighth surface water sampling event to be conducted at the site This report was prepared at the request of Mr Andrew smith of Herman & Helen s Marina Ii he -ioundwatcr and surtacc water samples collected during the second quarter, 2000 monitoring event were laboratory analy/cd for henrene toluene ethy[ bLivenL and total xylene~ (111 1 X) total pctroltum hydrocarbons quantified as gasoline ( [ I'll-(�), and selected gasoline, 0xygcnatLs/addit1vcS 1 h:S rt-port nieludes site background nilorination a 5u1rnnsary Of the, current U10111tor:ng. eve[st (ineludIng a dese.riptioii of the sampling and laboratory ana[vtical results), and a summary with conclusions 2. S11 F BACKGROUND On October 30, 1991, Warren L Gomes Excavating, Inc , of Rio Vista, California, excavated and removed three underground storage tanks (USgs) from the site (Figure 2, Appendix A) The LSTs (TK1, IK2, and IK3) contained gasoline and diesel fuel A small hole was found on the lower till end of TK3 (diesel tank) Petroleum staining and odors were noted in the soil beneath the former locations of the USTs Six soil samples were I collected by ( ondor from the U5 I' excavation at depths of 9 to 12 feet below the ground surface Laboratory analyses indicated elevated concentrations of 1 PII-(, BTYX, and total extractable petroleum hydrocarbons quantified as diesel (TEPH) In the soil samples On August 22, 1995 three hydropunch borings were drilled at the site C,asoilne odors were noted in each borehole Laboratory analyses indicated the presence of TPH-G and BTEX to the soil and groundwater samples analyzed from each borehole Based on the results of the August 1995, investigation, Condor recommended additional investigation be conducted to evaluate the extent of the hydrocarbon plume On August 29, 1996, five Geoprobe boreholes were installed at the site Tine results of the laboratory analyses indicated that elevated concentrations of TPH-C,, BTEX, and methyl tertiary butyl ether (MTBE) were present in soil and groundwater samples collected from the northern portion of the site and that further investigation was necessary to evaluate the extent of soil and groundwater contamination I Based on the results of the C,eoprobe investigation, Condor recommended that monitor wells be installed at the site to investigate and monitor the lateral extent of the gasoline and diesel contamination plume in the groundwater On September 10, 1997, Condor installed four monitor wells at the site The Report - Additional i i ��i CONDOR