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II 4, 't a .i i s q , , - �'` • , Z. PT I 'Iyy- 1i , j I s i .,a tts I I .4u a ti I a OJ Qcto6e2000;t I t • n � 4* 'ri { ' ' `Y t ' '• y ' V .a u� is,..r'{ 1ik,F�. i 3 " , �• ;, r ,. AGE NC,Project No 95'-Q 114 ' A ' . t •,y 1 ,1 X11., t t 1 I Page 4'of_5 - ss-ss was riot'detected in-the ne.wly`installed; down gradient; ground water'monitoring wells. BTEX.coinpounds'•were not detected.in,any of the ground water:saniples Concentraiions of P.CE reported iri the'water samples collected frorp wells MW6 and MW7 y exceeded the*Maxim6in Contaminant•Level (MCL) of 5;µg/l,:establishedby:the State%o'f California=Departtnent•of Health Services: `. 1ConeentratiphsA of cis 1;2'dichloroethene reported in'MW6 ($40,µg11) and IVIW3'( 20µg11), F exceeded the State MCL•of 6µg/l: y:• Concentrations-6 f vinyl chloride reported in'MW3.(13,0 µg/1) and MW6,(80'g/1) ekeeeded' 'the State'MCL of 0.5 µg/l,. ' s ` 5-Q' CONCLUSION. ' Based u' results of the investigation, AGE concluded that:` Wells at the site are "drowned"with well screen intervals 'as much as 11 feet below present ., -ground water surface: • The lateral extent of the dissolved halogenated-hydrocarbon plume has not been defined east of we11'MW-6 and MW-7.'. • As soil results indicate from the last quarterly report, the vertical'extent;of the dissolved ' hydrocarbon plume'has not been defined in the former UST area.` _ ' 6;0.'' ',RECOMMENDATIONS Based upon the ze"sults o 'the investigation; AGE recommends • Installation of 2 cone'pendtrometer.testing soil borings to defln6-theground water flow,units „ and.vertical Jextent of impacted soil arid ground water Installation oftwo additional ground`_ water,monitorin wells- one be and the eastern ed e of the ro e ' to determine the lateral c g Y . g p P ty extent of impacted ground water-and a see rid'well in-the"former.UST Y The next ground water monitoring event should be scheduled for,October 2000 ' Advanced GeoEiivironmentai,Inc.