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Herman&Helen 5 Marina..t Quarter 1998 Groundwater Monnormp April 16, 1998 PagL 3 3 FIRST QUARTER, 1998, GROUNDWATER MONITORING 31 FIELD METHODOLOGY On March 27, 1998, Condor personnel were on site to conduct quarterly groundwater monitoring The monitoring included measurement of water levels in the site monitor wells and at the surface water measurement stations and the collection of groundwater samples from the monitor wells All field equipment was decontaminated 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 in each 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 standard battery-operated, flat-tape, water-level meter A new, disposable, polyethylene barter was lowered into each well to collect a field-inspection sample The bailer sample was inspected for floating product, sheen, discoloration and/or odor Floating product was not observed in any of the monitor wells during the groundwater sampling No petroleum hydrocarbon odor was noted in any of the monitor wells EThe purging and sampling order for the monitor wells was MW-1, MW-3, MW-2, and MW-4 The wells were purged with a Grundfos Readiflo II submersible pump For the purpose of evaluating intrinsic bioremediation, various parameters were monitored during the purgmg of each well, including dissolved oxygen, reduction- oxidation potential, pll, electrical conductivity, and temperature The purge water was discharged to 55-gallon drums and left on site to await disposal Groundwater Monitoring I,reld I-orms are included to Appendix C Groundwater samples were collected by filling sample containers directly from the pump discharge tubing The groundwater was transferred to three 40-m1 glass VOA vials fitted with Teflon-Itned caps (for petroleum hydrocarbon analysis) and to a one-liter polyethylene bottle (for laboratory tested intrinsic bioremediation parameters - alkalinity, nitrate, sulfate, and ferrous iron) The vials were checked to assure that no air bubbles were present Each sample container was labeled and placed in a cooler chilled with ice and delivered under chain-of-custody procedures to GeoAnalytical Laboratories, Inc , in Modesto, California, within 24 hours of sample collection For quality control, one rinsate sample was collected and labeled 1432-MW5-3127198 The ansate sample was collected by pouring hydrocarbon-free water through the Grundfos Readiflo II submersible pump into the sampling containers after the pump was decontaminated Prior to collection of the rinsate sample, the pump was LW CONDOR