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installation and construction procedures and well <br /> construction details are presented in APPendix D. <br /> Ground water was first encountered during drilling at <br /> approximately 9 to 12 feet below grade in the monitorresults <br /> ing <br /> wells. Based on in y�ial wateer dsPottedth cscreen wasninstalled <br /> of previous investigations, to the total depth of the <br /> -- from 5 'feet below grade extending water level. The wells <br /> boring to account for fluctuations in from the top of the <br /> were then completed with blank casing <br /> slotted casing to approximately 0.5 feat below grade to <br /> provide adequate vertical space for seal materials. <br /> 3.4 <br /> ment and sampling procedures were conducted in <br /> Well develop uidelines and SJCEHS requirements. <br /> accordance with RWQge gneral field procedures for well <br /> •--• Alton Geoscience's geAppendix E. <br /> development and sampling are presented in <br /> 5 through AW-8 were Properly developed on <br /> Wells AW- <br /> Monitoring 10 casing volumes and allowing PH, <br /> May S, 1991, by removing purged water to <br /> temperature, and conductivity of the pound water monitoring <br /> stabilize. Prior to sampling, each g <br /> well was observed for the presence of free-floating Product <br /> or sheen. <br /> The ground water monitoring wells were then purged of 3 well <br /> casing volumes and PH, temperature and conductivity lintg. <br /> purged water were allowed to s tedrliz4usingpakclean Por to VCpbailer, <br /> Water same transported in an iced <br /> decanted into clean containers, and laborator for analysis <br /> cooler to a Californi�ece= servationoprocedures and chain of <br /> following proper same P well <br /> custody documentation. Field <br /> ling are presentedlinstherwater sampling <br /> development and san►endix E. <br /> survey forms in App <br /> v <br /> ori <br /> 3•, �� � ar 'LeVe_ <br /> A permanent reference mark at the top of each well casing was <br /> - of Tracy <br /> zurveyed on May 711 <br /> 1991, in roadspiket3ethinCanyisland on <br /> Benchmark Number 100, a railroad spike <br /> the centerlof tnetrailroadGrantlinspuratracksand 19�Theebenchmark from <br /> the centerline above <br /> has a USGS elevation of 31.50 feet aovementaServices,Tae <br /> surveying was conducted by <br /> California-licensed surveyor. <br /> 7 <br />