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Herman&Helen s Marina First Quarrer 2000 Groundwater Monitoring
<br /> April 20 2000
<br /> p3gC ?
<br /> . 5orl and (rroundivalei dated December I I 1997 was prepared by C ondor to describe the
<br />' investigation results
<br /> I PH-(;, 13TEX constitucnts MTBL, tertiary butanol, and tertiary amyl methyl ether (TAME) were detected in
<br /> some of the soil and groundwater samples t,ollected 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 /> I surface water sampling, and Risk Based Corrective Action (RBCA) 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 /> Scrviccs/Fnvironmental Health Department (PIIS/1-HD) 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 hiirthermore lie 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 Investtgationl.Surface Watei 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 Ilennan & 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 /> I 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 or the marma's pre-treated and treated drinking water from the facility s water treatment
<br /> system On December 30, 1998, March 26, 1999, June 30, 1999, September 23, 1999, and December 22 1999,
<br /> Condor conducted quarterly groundwater and surface water sampling as part of the fourth quarter, 1998, first
<br /> quarter, 1999, second quarter, 1999, third quarter, 1999, and fourth quarter, 1999, monitoring, respectively The
<br /> installation and sampling of the soil borings described by the above referenced Work Plan and Work Plan
<br /> Addendum is pending receipt of site access authorization from off-site property owners Comprehensive site
<br /> background information is included in Appendix B
<br /> 3 FIRST QUARTER, 2000, GROUNDWATER MONITORING
<br /> 3.1 FIELD METHODOLOGY
<br /> On March 17, 2000, a Condor representative was on site to conduct quarterly groundwater monitoring activities
<br /> IThe monitoring activities included measurement of water levels in the site monitor wells and at surface water
<br /> measurement stations and the collection of groundwater samples from the monitor wells All field equipment
<br /> was decontaminated in the field with a solution of laboratory-grade, non-phosphate detergent and hydrocarbon-
<br /> free water and rinsed with hydrocarbon-free water prior to use in each well All field instruments were calibrated
<br /> to the manufacturer's recommended standards The water level in each well was measured to the nearest 0 01
<br /> foot with a battery-operated, flat-tape, water-level meter A new, disposable, polyethylene bailer was lowered
<br /> into each well to collect a field-inspection sample The bailer sample was inspected for floating product, sheen,
<br /> discoloration and/or odor Floating product or sheens were not observed in the groundwater removed from any
<br /> of the monitor wells during the groundwater sampling Moderate petroleum hydrocarbon odor was noted in the
<br /> groundwater recovered from MW-2 and MW-3 No petroleum hydrocarbon odor was noted in the groundwater
<br /> • recovered from TVI W-I and MW-4
<br /> `� CONDOR
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