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GROUNDWATER <br /> C�❑ <br /> TECHNOLOGY . GroundwaterTe'hnology,Inc <br /> 1401 Halyard Drive,Suite 140,West Sacramento,CA 95691 IDSA <br /> April 29, 1996 <br /> Tel (916}372-4700 Fax (916)372-8781 <br /> Mr Bob DeNinno <br /> The Southland Corporation <br /> 19033 West Valley Hwy,D-104 <br /> Kent,WA 9a032 <br /> Subject First Quarter 1996 Monitoring and Sampling Report <br /> Southland Site No 20304 <br /> 455 Grant Line Road <br /> Tracy, California <br /> GTI Project 02070 0231 <br /> Dear Mr DeNinno <br /> This First Quarter 1996 Monitoring and Sampling Report presents the results of monitoring and <br /> sampling activities performed by Groundwater Technology,Inc at The Southland Corporation <br /> (Southland) Store No 20304 located at 455 Grant tine Road in Tracy,California (Figures 1 and 2, <br /> Attachment 1) on March 20, 1996 Activities conducted during this reporting period are summarized <br /> below ' <br /> ■ Depth to water(DTW) was gauged in 11 groundwater monitoring wells and one <br /> groundwater extraction well (Figure 2,Attachment 1) <br /> e Groundwater samples were collected from wells MW 4,MW-5, MW-8,MW-9,MY'J 10 <br /> and GWE-1 and submitted to a cerufted laooratory foi analysis for benzene,toluene, <br /> ethylbenzene and xylenes(BTEX), methyl-tert-butyl-ether(MTBE), and total petroleum <br /> hydrocarbons-as-gasoline (TPH-G) <br /> Groundwater Monitoring Data <br /> Groundwater monitoring was pertormed on March 20, 1996 Pnor to monitoring,the well caps of each <br /> well were opened to allow the water level in each well to stabilize to atmospheric pressure The DTW <br /> was measured to the nearest 0 01 foot from the top of the well casing using an ORS Environmental <br /> Equipment INTERFACE PROBE Well Monitoring System <br /> Separate-phase hydrocdrbons were not detected in any of the monitoring wells The water table <br /> elevations, calculated from the March 20, 1996 monitoring data,were used to prepare a potenbometnc <br /> surface map(Figure 2) The groundwater flow is toward the north at a hydraulic gradient of 0 01 Mt. <br /> Locally,the groundwater gradient is toward the active extrachon well when the system is operating <br /> The system was operating during this monrtonng and sampling event The historical and current water <br /> level measurements are presented in Table 1 (Attachment 2) Field data sheets are included in <br /> Attachment 3 <br /> 64710198 RF?(ST14L.5 1) <br /> Oniras tnror 91rout the 1,S Ca-a&x ma Overseas <br />