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1 ti <br /> GT v C- <br /> 1 <br /> , f <br /> f <br />' 20 September 2001 <br /> AGE-NC Project No 96-0235 <br /> L r. <br /> Page 3 of 8 <br />' Ground water samples collected from the former UST No 3 locations will be analyzed for <br /> TPH-g and TPH-d in accordance with EPA Method 8015 Modified,,and A <br />' BTEX and methyl tertiary butyl ether (MTBE) in accordance with EPA Method 8020 <br /> 0 <br /> r <br /> Laboratory reports for ground water'analysis, testing methods, laboratory quality assurance/quality <br /> control(QA/QC) reports, and sample chain of custody documentation will be presented in a report, <br /> with findings and recommendations _ <br /> 23 WELL INSTALLATION - FORMER UST CLUSTER LOCATION <br /> Three clustered ground water monitoring wells will be installed in the areas south,west, and east of <br /> the former UST cluster area to total depths between 30 feet below surface grade (bsg) and <br /> approximately 70 feet bsg,utilizing a drill rig equipped with 8 25-mch diameter hollow-stem augers <br /> The borings will be completed as ground water monitoring wells with two-inch diameter screened <br /> casings Installed with approximately 5 to 10 feet of screen Screen intervals will be based on CPT <br /> findings Soil samples will be collected at 5-foot intervals, beginning at a depth of 5 feet bsg <br /> Additional cluster wells may be installed pending results of the CPT investigation <br /> Procedures for the advancement of pilot borings and installation of the wells were described in the <br /> Monitoring Well-Installation Work Plan-Marich 1998,prepared by AGE A generalized monitoring <br /> well design is illustrated on Figure 3 The proposed well locations are depicted on Figure 2 <br /> ' 24 'WELL INSTALLATION - FORMER UST NO 3 LOCATION <br /> Initially, AGE proposes installation of two ground water monitoring wells in the areas south and <br /> southeast of the former UST No 3 area utilizing a drill rig equipped with'8-mch diameter hollow- <br /> Ground-water stem augers Ground-water monitoring well locations4nd screen intervals of the wells are proposed <br /> to provide definition of the extent df dissolved hydrocarbon impact in both first encountered and <br /> deeper ground water intervals as well as providing a means to monitor the vertical extent of <br /> hydrocarbon contamination 'Screen intervals of the wells will be based on findings from the CPT <br /> investigation If'multiple potential contaminant migratidn pathways are encountered, additional! ` <br /> 1 monitoring wells may be needed Proposed monitoring well locations are illustrated on Figure 2 <br /> rJ <br /> ! <br /> r ;Idvanced CeoEnvirnnmentai,Inc <br />