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*010 *90 <br /> 2005 and analyzed for total dissolved chromium and hexavalent chromium. Total dissolved chromium <br /> was detected in CWS-20 at a concentration of 11 ug/l and CWS-62 at a concentration of I 1 ug/l. <br /> LHexavalent chromium was detected in wells CWS-20 and CWS-62 at concentrations of 4.5 ug/l and 4 <br /> ug/I respectively(Table 4). <br /> L <br /> 4.7 Domestic Wells <br /> L 4.7.1 January 2005 <br /> r. Groundwater samples were collected from five domestic wells in the area south of Main Street and north <br /> of the Mormon Slough between Oro Avenue and Walker Lane and analyzed for total dissolved chromium <br /> and hexavalent chromium in January 2005 (Table 4). Total dissolved chromium was only detected in <br /> Cuneo Domestic at a concentration of 6.6 ug/l. Hexavalent chromium was detected in four of the five <br /> groundwater samples at concentrations ranging from 0.7 ug/1 in 5116D to 2.8 ug/1 in Cuneo Domestic <br /> (Table 4). <br /> 4.8 Irrigation Wells <br /> 4.8.1 January 2005 <br /> A groundwater sample was collected from Columbini Irrigation#3, which is located in the area south of <br /> Main Street and north of the Mormon Slough between Oro Avenue and Walker Lane(Table 4; <br /> Figure 15). The sample was analyzed for total dissolved chromium and hexavalent chromium in January <br /> 2005,neither of which was detected above their respective detection limits(Table 4). <br /> Marley Cooling Technologies 3909-09 <br /> Semi-Annual Groundwater Monitoring Report Dudek&Associates,Inc. <br /> October 1004/January 2005 -16- April 2005 <br />