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' CLEARWATER I {`
<br /> G R O U P, I [`,I C
<br /> ' I •
<br /> '4 1
<br /> ! ' ' in 'Hayw'ard, California Soil samples were analyzed for total petroleum
<br /> hydrocarbons as gasoline by EPA-Method, 8015 (modified), and benzene, toluene,
<br /> ethylbenzene,,and total `xylenes'(BTEX) by EPA Method 8020 (modified) '
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<br /> ,! Each continuous core sample was retained for visual lithologid description by a
<br /> Clearwater geologist using the Unified Soil Classification System, and for volatile
<br /> organic headspace,analysis using a Mini RAE photo-ionization detector (PID) PID
<br /> readings are ,presented on the Soil Bori ig Log and Well Construction Diagrams in `
<br /> Appendix, C Soil cuttings generated from drilling were wrapped in plastic and
<br /> ` stored on-site,` pending future reri ioval+
<br /> i
<br /> 2.2 Monitoring Well Installation, Development and Survey
<br /> On u ust 31, r1994,'asoil borings MW-4 and MW-,5 were converted into two-inch
<br /> ' 'diameter ,monitoring,weils with+the same designations Well locations are shown I,
<br /> on, Figure 2 On Sep ember '15 '024,F the elevation" of the ,top-of-casing of ,all f;1
<br /> monitoring well's were surveyed relative to a teinporary benchmark The new
<br /> monitoring wells were developed'`by a combination of surging and bailing on '
<br /> 2:3 Groundwater Gauging, Sampling and Analysis
<br /> The•lmonitoring wellls'wer`e�gauged' and sampled on Septemb�r'27,'1994 Prior to
<br /> sampling,I all wells`,were�purged' of' a minimum of; three✓✓well volumes Well
<br /> I
<br /> purging information,is p7r�esented 'on'the,Gauge Data/Purge Calculations aind'Purge'
<br /> ' I ,(Data 'forms itn Appendix tJ
<br /> 1 ' f r ` , 1
<br /> I Following (recovery of 'water'levels to at least 80% of, their static levels, �groundwater
<br /> samples,were "collected from the' monitoring wells,'using dedicated polyethylene I
<br /> !
<br />' bailers Samples` were labeled, documented' ori:'a chain-of-custody form,' and,placed
<br /> lin a'cooler for,transport to Trace`Analysis The ground water samples were aiialyze& r
<br /> i„ a , !, , i 1 f
<br /> ' for TPHg by EPA'Method 8015 (modified) and BTEX by CEPA Method 8020 (modified)
<br /> `,
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<br /> 3.0"RESULTS AND DISCUSSION('
<br /> I i ,I, 1 ` ''>• I I'� J '� 1 i I r i , ` I' (I I V
<br /> 3:1 `Site Stratigraphy 1
<br /> r I ' } , , I , I' , 7 '`
<br /> Sedirnen#s encountered during drilling'consisted primarily'of Sllts,,,,ii h'interbedded
<br /> I ',I II' ' ' I ' I ' ' I l % I '1 I[ I ,1 'I C1,
<br /> sandy silts and silty sands` „Some thin 1saxid lenses were also encountered, Complete'',
<br /> 1 ,f I I � 'I I 1 t ',I { I r � 1 I i ' 111 'i 4l , ' I , , I�
<br /> soil r sarnple descriptions'' are 'presented ;on':,the Soil', Boring Log,
<br /> II 1Ill
<br /> Construction,Diagrams,In Appendix'C
<br /> E
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<br /> I cp ('all" I I 'r ' I 3 1 a l 1,k ti , i '1 , 11'1 I
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<br /> 11 + r1 h �'I I' I ' �I' ' '' ,w 1� r� � 'E, ! 'I�1 t I I '�3 I{
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