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Herman&Helen s Marina--Fourth Quarter 1999 Groundwater Monitoring
<br /> February 1 2000
<br /> Page -2-
<br /> %d and Groundwater InveVigation dated December 11, 1997, was prepared by Condor to describe the
<br /> investigation results
<br />' TPH-G, B3 EX constituents, MTBE, tertiary butanol, and tertiary amyl methyl ether (TAME) 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 (RBCA) to further characterize the site and to
<br /> Ievaluate 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/>;HD) indicated that, based on his review of the report dated
<br /> December 1 l, 1997 (referenced above), he was requesting that quarterly groundwater monitoring continue at the
<br /> site Furthermore, 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 Herman & 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 25, 1999, June 30, 1999, and September 23, 1999, Condor conducted
<br /> quarterly groundwater and surface water sampling as part of the fourth quarter, 1998, first quarter, 1999, second
<br /> quarter, 1999, and third quarter, 1999, monitoring, respectively The installation and sampling of the soil borings
<br /> described by the above referenced Work Plan and Work Flan Addendum is pending receipt of site access
<br /> authorization from off-site property owners Comprehensive site background information is included in
<br /> Appendix B
<br /> I 3 FOURTH QUARTER, 1999, GROUNDWATER MONITORING
<br /> 3.1 FTELD METHODOLOGY
<br /> On December 22, 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 /> 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 /> I was lowered into each well to collect a field-inspection sample The bailer sample was inspected for floating
<br /> product, sheen, discoloration and/or odor FIoating product or sheens were not observed in the groundwater
<br /> removed from any of the monitor wells during the groundwater sampling A septic odor was noted in the
<br /> groundwater recovered from MW-1 Slight, moderate, and strong petroleum hydrocarbon odors were noted in
<br /> the groundwater recovered from MW-4, MW-3,and MW-2, respectively
<br /> ti� CONDOR
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