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<br /> 11, EARWATER
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<br /> C R O U P, I N C �.
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<br /> 3.2 Results'of Soil'Sample Analysis
<br /> Neither TPHd nor BTEX was detected in concentrations exceeding' the method
<br /> 'detection limits ' in soil samples collected ,from boringsMW-4 and MW-5 A.'
<br /> ' summary of soil sample analytical `results is presented on Table 1 'A copy of the
<br /> ` laboratory 1 reports and chain-of-custody forms are attached iii Appendix E }
<br /> 1 '
<br /> 3.3 Groundwater Gradient
<br /> I On September, 27, '1994, the depth to groundwater,in each of the wells 'ranged from
<br /> 27 86 tb 29 24 feet below glade Groundwater flow was determined`to'vary betwee
<br /> the northwest at 'an approximate `gradient of 035 ft/ft'and the north-northwest at
<br /> an approximate gradient of 0 014`ft/ft Depth to water measurements'and swellhead'
<br /> elevation data were used to calculate groundwater elevation contours (Figure 3)
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<br /> ' 3 4 Results of Groundwater Sample Analysis' , ; '
<br /> Separate-phase petroleum was not detected in lany of the monitoring wells TPHg '
<br /> 'was,d`etected in groundwater,samples'collected. from monitoring wells MW-1, and ,
<br /> MW-2 in concentrations of 87 parts per billion (ppb), and 37,000 ppb, respectively
<br /> I� Benzene✓was detected in groundwater samples collected ,from monitoring wells
<br /> °� MW-1, MW-2, MW-3, MW-4 and.MW-5 in concentrations of 89 ppb, 340 ppb, 98 ppb,'
<br /> y b 5,'prpb and 140 ppb, ,respectively , A summary of groundwater elevations and ,
<br /> analytical results is presented,ori,Table 12 'Hydrocarbon c6ni entrationsl are,6displayed I ,
<br /> ra Meal l ,on the„HI drocarbbn Concentration-Ma (Figureg 4 A` co of the'
<br />" g p , y , Y p , ) pY 1Ir
<br /> laboratory report's and chain-'offorms,are attached'in Appendxx'E
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<br /> ' 'I '� ' 1 'I 1'�I ' l I V i L I I r,F ,I I'` '" , '
<br /> 4.0I s SUMMARY� I �� SIV�,I �� �
<br /> r 1 1 r'
<br /> The`,results of the, field,,activiiies aatd laboratory ,analyses 'of soil arid' groundwater`
<br /> samples collected during this phase of investigation,are discussed below '
<br /> ' '' ,F, Idf ! 1 1 I i If E i , li
<br /> ' Two two-inch,diameter monitoring&wells were,m"s'talled on-site August 31,11994
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<br /> I Sediments encountered Iduring ,drilling' cons;st6d ' primarily of 'Silts with
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<br /> sandy silts and silty sands ' '
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<br /> I r • Neithel,r,,TPHg{Inor BTEX Iwas detected ,in concentrations eXceeding 'the 'met:-iod,
<br /> ' r detection I=its in.soil`samples-collected' frombbringsYkMW-�andIMW�S
<br /> 1�Np
<br /> On September,27,'1994,',the'depth to groundwater in'each of the ,wells ranged'from
<br /> 2786 to' 29'24 feet'below grade ,Groundwater�flow was, determined I`to, vary
<br /> f ' between 'the 'nortliwest''at, an' approximate gradient of 3 51%' and ' th'e nor
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<br /> t northwest at an approximate gradient,of 13714F� V1 l I I ,
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