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I HLrinan& Hc1en ti M inns- I uurth Quarter 1998 (,roanLiw iter Monrtonne i rchruary 7 1999 Pate 2 Pll4i 13 1 I-X constituents, M 1131 tLrtiary butanol and tertiary amy I methyl ether (FAML) werL detLLtLd to I soniL of tht. uid acid groundwater samples collected during the investigation Groundwater CILvritton data indicated that grouncINNaki- flow it thL sitL was probably controlled by the very activL island drainage pumping system adjacent to the, site F11e above, refcienced icport rcLommended quarterly groundwater monitoring, surfaLL water sampling; and Ri,,k Based CorrLLtiVL Action (RB( A) to further charaLtLri/-L thL Site and to LvaluatL option,, for remediation or site closure I In a tLILp11011L Lonvcrsation on March 23 1998, Mr Ronald Rowe of the, San Joaquin County Public lIealth services/l nvironmLrital Health I)epartmLnt (PHY1 Hf)) indicated that based on his review of ilii report dated DLCLmbLr 1 1 1997 (refLrLnced above), hL was rLquLsting that quarterly groundwater monitoring continue at the site I uilhLrinorL he rLquLsted that a vkork plan be prLpared for Londucting quarterly surface water sampling and additional investigation of thL gasolim- oxygenate/add1t1VL plume to thL cast of monitor well MW-2 (ondor subsLquLntly prepared thL Poi k flan 4ddittuttal ,Sort and Cwt owitlit ate i Invc vttgutttni/sut fuer if'utc l .sampling, dated May 27, 1998 In a faxed note dated June. 1 1998, Mr RowL approved the work plan with the stipulation that i work plan addendum he pri-pared describing installation of additional borings to those proposed in the work plan and grab sampling of the. Iferman & Helen's Marina drinking water source Condor ,ubsequently prepared the Woik Platz Addendum, dated July 9 1998 In a fax dated July 27, 1998, Mr Ron Rowe approved the work plan addendum adding that both thL facility pre-treated drinking water and the post-treatment water should be sampled and analyzed by appropriate methods A comprehensive site background is included in Appendix 13 3 FOURTH QUARTER, 1998, GROUNDWATER MONiTOR1NG 3.1 FIELD METHODOLOGY On I)ccerlihcr 30, 1998, a t ondor representative was on site to conduct quarterly groundwatLr monitoring aLtir uses HIL monitoring, activities included iuLasurLMLnt of water levels in the Site monitor wLlls and at surface water mcasurement stations and the COHCLtion of groundwater samples from the monitor we]I's All field equipment was dLcontamtnatLd in the field with a solution of laboratory-grade, non-phosphate detergent and hydrocarbon-free water and rinsed with hydrocarbon-free water prior to use m Lach well All field instruments were calibrated to the manufacturer's recommended standards The water level in each well was measured to the nearest 0 01 foot with a battery-operated, flat-tape, water-level meter A new, disposable, polyethylene bailer was lowered into cacti well to collect a field-inspection sample The bailer sample was inspected for floating product, sheen, discoloration and/or odor Floating product or sheens were not observed in the groundwater removed from any of the. monitor wells during the groundwater sampling PLtrolcum hydrocarbon odors were not noted in the groundwater samples collected from the four monitor wells I The purging and sampling sequence for the monitor wLlls was MW-1, MW-3, MW-2, and MW-4 Each well was purged with a new, disposable, polyethylene bailer until three well-casing volumes of water had been removed and the electrical conductivity, pH, and temperature of the water had stabilized The purge water was discharged to 55-gallon drums and left on site to await disposal Groundwater Monitoring Field Forms are included in Appendix C I i A groundwater sample was collected from each well by filling a new, disposable, polyethylene bailer with groundwater and transferring the groundwater to two 40-milliliter glass vials fitted with Teflon-lined caps The vials were checked to assure that no air bubbles were present Fach sample container was labeled and placed in a I cooler chilled with [Le and delivered under Lham-of-custody procedures to GeoAnalytical Laboratories, Inc , in Modesto, California, within 24 hours of sample collection Results of laboratory analyses are discussed in Section 3 3 n {�J CONDOR