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QUARTl3RLY MONITORING REPORT FOURTTt UARTER OF 19911 <br /> Tray Boulevard Shell <br /> 3725 Tracy Boulevard,Tracy,Caliromia <br /> Shelt WIC No.204-7884-Ml <br /> Delta Project Na,40.89.012 <br /> — Page 2 <br /> 2.2 Manitorin�We115 <br /> Monitoring wells MW-1,MW-2,and MW-3 were d;-illed and installed around the perimeter of the site to <br /> a depth of 22 feet. 'These wells were abandoned and replaced with monitoring wells MW-IA,MW-2A,and <br /> MW-3A on August 16, 1990. The new wells were installed adjacent to the abandoned well locations <br /> (Figure 2). <br /> 3.0 RE, OF 1NViSTIGATION ACTTVITIF,S <br /> 3.1 Ground Witter Elevation Data <br /> Depths to ground water were measured at monitoring wells MW-1A, MW-2A, and MW-3A on <br /> November 19,1990. Ground water elevations are summarized in Table 1. Using ground water elevation <br /> data collected during the November 19,1990,sampling event,the ground water flow direction was towards <br /> the northeast at a hydraulic gradient of approximately 0.0016. A groundwater contour map based on <br /> measurements collected on November 19,1990,is illustrated in Figure 3. <br /> 3.2 Ground Water Anal tcal Results <br /> Ground water samples were collected on November 19,1990,from monitoring wells MW-1A,MW-2A,and <br /> MW-3A and were submitted to a California certified laboratory for analysis of benzene, toluene, <br /> ethylbenzene and xylene(BTEX),and total petroleum hydrocarbons(rPH). Chemical analysis results of <br /> monitoring wells MW-IA, MW-2A, and MW-3A were all below detection limits for BTEX and TPH as <br /> gasoline. <br /> Ground water analytical results for samples collected through November 19, 1990, are summarized in <br /> Table 2. Certified laboratory reports are presented in Appendix A Ground water samples will be collected <br /> in February 1991 for chemical analysis of BTEX and TPH as gasoline. <br />