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' IFLIMdn do lkkn �Marina `caind QUdrTLr 1999 Ground%tidn.r Monitoring
<br /> Augutit 20 1999
<br /> PdgL ?
<br /> B I LX e0111411uents MT13L tertian butanol and tertiary amy 1 methvl ether (TAME) wf_re, detected in
<br /> some of the soil and groundwater Samples s_ollee,tt d during the investigation Groundwater elevation data
<br />' indicated that groundwater floe at the sitt %vas probably controlled by the very aLtive island drainage pumping
<br /> system adlac,ent to the. site Me above referenced report reuimmended quarterly groundwater monitoring,
<br /> surface water sampling and Risk Based C'orrctrtt-ve Action (RBCA) to further cliarac,terize the site and to
<br />' evaluate ofltlons for remediation or stte elosurc
<br /> In a telephone. c,onv Lrsatiol7 on March 23 1998 Mr Ronald Rowe of the San Joaquin County Public 144 alth
<br /> Serv1ces/1 nvu(Inmental Health Department (Pf1S/l 1lD) tndtc.3tcd that, based on fits review of the. report dated
<br /> Decunber i I 1997 (refLre.need above.) he \\as rLqucstlnc that quarterly groundwater monitoring continue at the
<br /> site I~urthcrinore he requested that a work plan be prepared for conducting quarterly surface, water sampling
<br /> and additional mvestigation of the gasohne 0\v0c Hate/additive plume, to the east of monitor well MW-2 Condor
<br /> subsequently prepared the Work Phis Addmoiial. cod and Gi oundii ulC i Ini evigalionl.5uiface Wulc i .Sampling
<br /> dated May 27, 1998 In a faced 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 & Ilelen's Marina drinking water source Condor subsequently
<br /> prepared the f1'nik 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 analysed by appropriate methods
<br /> On October 1, 1998, a ( ondor reprLSLntative was oil site. to conduct quarterly surface water sampling activities
<br /> and collect a sample of the, marina's pre,-treated and treated drinkiing water from the, facility's water treatment
<br /> system On DecembLr 30, 1998, and March 26, 1999, Condor eonductLd quarterly surface water sampling as
<br /> I part of the fourth quarter, 1998, and first quarter, 1999, monitoring The installation and sampling of the soil
<br /> borings described by the above referenced Work Plan and Work Plan Addendum is pending receipt of site access
<br /> authorization from off-site property owners A comprehensive site background is included in Appendix B
<br /> 3 SECOND QUARTER, 1999, GROUNDWATER MONITORING
<br /> 31 FIELD METHODOLOGY
<br /> On June 30, 1999, a C ondor representative was on site to conduct quarterly groundwater monitoring activities
<br /> The monitoring activities included measurement of water levels in the site monitor wells and at surface water
<br /> measurement stations and the co]Iection of groundwater samples from the monitor wc,lls 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 standard,, I he 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 cacti we.11 to collect a field-nnspection sample The bailer sample was inspected for floating product, sheen,
<br /> discoloration and/or odor I loating product or sheens were not observed in the groundwater removed from any
<br /> I of the monitor wells during the groundwater sampling Petroleum hydrocarbon odors were not noted in the
<br /> groundwater samples collected from the four monitor wells
<br /> The purging and sampling sequence for the monitor wells was MW-1, MW-4, MW-3, and MW-2 Fach well
<br /> Iwas purged with a new, disposable, polyethylene bailer until three well-casing volumes of water had been
<br /> removed and the electrical conductivity, pfl, and temperature of the water had stabilized The purge water was
<br /> discharged to 55-gallon drums and left on site to await disposal Oroundwater Monitoring 1 ield Forms are
<br /> included in Appendix C
<br /> L� CONDOR
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