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Table 3 I} <br /> Summary of Monitored Natural Attenuation Parameters in Groundwater <br /> Second Quarter 2009 Operations,Maintenance and Monitoring(OM&M)Report <br /> CalTrans Maintenance Station,Shop 10 <br /> Field Parameters Laboratory Analysis <br /> Sample Sample Date OO Fe(I1) _ ORP Nitrate(by E4,300.0) Sulfate{by EPA 300.01 <br /> Identification { l <br /> ' Units <br /> m 1L m 1L mV } b m !L <br /> t <br /> VM-2 671412005 0.11 2.0 52 ds 0.44'` -31 <br /> ... - 9!22!2005 0.10 1.8 -54 - - <br /> 1212112005 023 2.10 -01 - <br /> _ 3/16/2006 0.23 1.1 -25 3.1 <br /> T 6115/1006 0.49 0.6 154 .1 <br /> 9129/20061 1.44 1,2 51 i. 0.45.` 27 <br /> 12122/2006 2.22 0.0 -112 l+ --j - <br /> 3l2012007 0:76 0.0 170.6 -4 <br /> f <br /> i 611112007 6.05 0.4 - 223 II 0.14,E 35 <br /> 12/10/2007 0.14 0.7 73 - <br /> 3/1012008 7.83 02 117 - <br /> 512712008 6.14 0,0 181 I' NDr0.10 37 <br /> - 919/2008 3.73 0.0 205 .r - - <br /> # 1112012008 6.00 0.0 58 <br /> S � 2!2312009 1.27 <br /> 5/26/2009 9.47 <br /> Notes: -= Sample not collected,data not available. - <br /> - mg1L= Milligrams per liter ' <br /> mv= Millivolts <br /> DO= Dissolved oxygen measured using down well probe . <br /> - - ORP= Oxidationfreductior potential - <br /> � i! <br /> I _ _ Air sparge system was started 6-7-D6. <br /> 1 1-ORP data collected during 9127106-91291D6 was from Fa different meter and may be considered <br /> k inaccurate,compared to historical levels. <br /> 6 i <br /> 2-Fe(II)and ORP discontinued in January 2009 due to sufficient evidence collected of the occurance of aerobic bio attenuation onsite. <br /> tt ' <br /> d <br /> q <br /> � y <br /> IN <br /> f lrf " <br /> Q2'09 OMM Tables xlslTable 3 5 of 5 .t - 7/31/2009 <br /> Ir <br />