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Herman Lvz llt]Ln %Marina - Fourth Quamr 2000 Groundwater Monitoring
<br /> January 12 2041
<br /> 10Page2
<br /> Soil and Groundwater hivevtigation dated December 11, 1997 was prepared by Condor to describe the
<br /> investigation results
<br /> rPH-G, BTEX constituents, MTB1~, tertiary butanol, and tertiary amyl methyl ether ( IAME) were detected in
<br /> some of tlit 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 /> I surface water sampling, and Risk Based Corrective Action (RBCA) to turther characterize, the site and to
<br /> evaluate options for remediation or site closure
<br /> In a telephone conversation on March 23, 1998, Mr Rowe of the PI IS/EHD indicated that, based on his review
<br /> of the report dated December 11, 1997 (referenced above), he was requesting that quarterly groundwater
<br /> monitoring continue at the site Furthermore, he requested that a work plan be prepared for conducting quarterly
<br /> surface water sampling and additional investigation of the gasoline oxygenateladditive plume to the east of
<br /> monitor well MW-2 Condor subsequently prepared the Work Plan -- Additional Soil and Groundwater
<br /> Investigation/Surface Water Sampling, dated May 27, 1998 In a fax dated June 1, 1998, Mr Rowe approved the
<br /> work plan with the stipulation that a work plan addendum be prepared describing installation of additional
<br /> borings to those proposed in the work plan and grab sampling of the Herman & Helen's Marina drinking water
<br /> source Condor subsequently prepared the Work Plan Addendum, dated July 9, 1998 In a fax dated July 27,
<br /> 1998, Mr Rowe approved the work plan addendum adding that both the facility pre-treated drinking water and
<br />' the post-treatment water 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 1"rom December 1998, through the current monitoring event (December 2000), Condor conducted
<br /> quarterly groundwater and surface water sampling
<br />' In a letter dated lune 30, 2000, Mr Rowe directed the submittal of a work plan amendment to modify the scope
<br /> of work proposed in the above referenced work plan and work plan addendum According to Mr Rowe, the
<br />' work plan amendment was to describe vertical characterization of the potential MTBE plume and be submitted
<br /> by August 1, 2000 In addition, Mr Rowe required that a report of the work be submitted by September 1, 2000
<br /> Condor subsequently prepared the Status Report and Addendum to the Work Plan, dated July 24, 2000 Mr
<br />' Rowe approved the work plan amendment in a fax dated August 3, 2000 In a telephone conversation with Mr
<br /> Rowe on August 3, 2000, Condor requested that the submittal date for the report of findings be extended to
<br /> October 6, 2000 Mr Rowe verbally concurred with the extension and requested that Condor prepare a letter to
<br />' document the conversation Condor followed up with a letter dated August 3, 2000
<br /> The installation and sampling of the soil borings described by the Work Plan, Work Plan Addendum, and Work
<br />' Plan Amendment were conducted at the site between September I1 and September 13, 2000 Direct push
<br /> (Geoprobe), hand auger, and hollow-stem auger techniques were used to advance 13 borings at the site (Borings
<br /> DP-1 through DP-9, SP-1, and HP-1 through fIP-3) for the purpose of collecting soil and groundwater samples
<br />' The results of the investigation were described in the Soil and Groundwater Investigation and Sensitive Receptor
<br /> Survey Report, dated October 2, 2000 The results of the investigation generally indicated that the MTBE plume
<br /> to the east of the site appears to be significantly influenced by the surface water drainage and pumping to the east
<br /> and south of the site Relatively low concentrations of MTBE, however, were present in groundwater beyond the
<br /> drainage ditch to the east of the site The sensitive receptor survey did not indicate any readily identifiable
<br /> sensitive receptors within a radius of 2,000-teet around the site (other than the surface water bodies adjacent to
<br />' the site) Based on the results of the investigation, Condor recommended additional investigation to confirm the
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