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<br /> Herman&Helen.Manna--Third Quarter 1999 Groundwater Momtonng
<br /> October 26 1999
<br /> Page-2-
<br /> TPI 1-G, B I FX constituents, M L m, tertiary butanol and tertiary amyl methyl ether ( 1 AME) were detected in
<br />' some of the soil and groundwater samples collected during the investigation Groundwater elevation data
<br /> indicated that groundwater flow at the site was probably controlled by the very active island drainage pumping
<br /> system adjacent to the site The above referenced report recommended quarterly groundwater monitoring.,
<br /> surface water sampling, and Risk Based Corrective Action (RSCA) to further characterize the site and to
<br /> evaluate options for remediation or site closure
<br />' In a telephone conversation on March 23, 1998, Mr Ronald Rowe of the San Joaquin County Public Health
<br /> Services/Environmental Health Department (PHS/EIID) indicated that, based on his review of the report dated
<br /> December 11 1997 (referenced above), he was requesting that quarterly groundwater monitoring continue at the
<br /> site Purthermore, he requested that a work plan be prepared for conducting quarterly surface water sampling
<br /> and additional investigation of the gasoline oxygenate/additive plume to the east of monitor well MW-2 Condor
<br /> subsequently prepared the Work Plan —Additional Soil and Groundwater Investigation/Surface Water Sampling,
<br /> dated May 27, 1998 In a faxed note dated June 1, 1998, Mr Rowe approved the work plan with the stipulation
<br /> that a work plan addendum be prepared describing installation of additional borings to those proposed in the
<br /> work plan and grab sampling of the Kerman & Helen's Marina drinking water source Condor subsequently
<br /> prepared the Work Plan Addendum, dated July 9, 1998 In a fax dated July 27, 1998, Mr Ron Rowe approved
<br /> the work plan addendum adding that both the facility pre-treated drinking water and the post-treatment water
<br /> should be sampled and analyzed by appropriate methods
<br /> On October 1, 1998, a Condor representative was on site to conduct quarterly surface water sampling activities
<br /> and collect a sample of the marina's pre-treated and treated drinking water from the facility's water treatment
<br /> system On December 30, 1998, March 26, 1999, and June 30, 1999, Condor conducted quarterly groundwater
<br /> and surface water sampling as part of the fourth quarter, 1998, first quarter 1999, and second quarter, 1999,
<br /> monitoring, respectively The installation and sampling of the soil borings described by the above referenced
<br /> Work Plan and Work Plan Addendum is pending receipt of site access authorization from off-site property
<br /> owners A comprehensive site background is included in Appendix B
<br /> 3 THIRD QUARTER, 1999, GROUNDWATER MONITORING
<br /> I3.1 FIELD METHODOLOGY
<br /> On September 23, 1999, a Condor representative was on site to conduct quarterly groundwater monitoring
<br /> activities The monitoring activities included measurement of water levels in the site monitor wells and at
<br /> surface water measurement stations and the collection of groundwater samples from the monitor wells All field
<br /> equipment was decontaminated in the field with a solution of laboratory-grade, non-phosphate detergent and
<br /> hydrocarbon-free water and rinsed with hydrocarbon-free water prior to use in each well All field instruments
<br /> I were calibrated to the manufacturer's recommended standards The water level in each well was measured to the
<br /> nearest 0 01 foot with a battery-operated, flat-tape, water-level meter A new, disposable, polyethylene bailer
<br /> was lowered into each well to collect afield-inspection sample The bailer sample was inspected for floating
<br /> product, sheen, discoloration and/or odor Floating product or sheens were not observed in the groundwater
<br /> removed from any of the monitor wells during the groundwater sampling A slight petroleum hydrocarbon odor
<br /> was noted in the groundwater recovered from MW-2 Petroleum hydrocarbon odors were not noted in the
<br />' groundwater samples collected from monitor wells MW-1, MW-3, and MW-4
<br /> The purging and sampling sequence for the monitor wells was MW-1, MW-4, MW-3, and MW-2 Each well
<br /> was purged with a new, disposable, polyethylene bailer until three well-casing volumes of water had been
<br /> removed and the electrical conductivity, pH, and temperature of the water had stabilized The purge water was
<br /> discharged to 55-gallon drums and left on site to await disposal Groundwater Monitoring Field Forms are
<br /> included in Appendix C
<br /> La CONDOR
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