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Monitoring Report Compliance Che., ist <br /> Discharges Regulated by Title 27 and/or Part 258 <br /> RWQCB <br /> Reference Parameter Yes No N/A Reviewer Comment <br /> WDRs/MRP/ Groundwater Monitoring <br /> Standard <br /> Provisions 1. Are all groundwater Field Parameters X Did the 5-year Constituents of <br /> (Sept 93/Aug 97) Monitoring Parameter, and COCl Concern. <br /> (if required) sampled and analyzed? <br /> in. Have any groundwater concentration X 1,2-DCA detected in G-3D(a <br /> limits been exceeded? If yes, identify downgradient well) <br /> in comments. <br /> n. Is there a description and graphical X <br /> presentation of groundwater flow <br /> direction and gradient? <br /> o. Monitoring Wells: Is there a X <br /> description,method, and tines <br /> of water level measurement and <br /> well tecovery time? <br /> p. Purging: Is there a description X <br /> of the purging method,purge <br /> pump and its placement, and <br /> field parameters? <br /> Additional Comments and Recommendations: <br /> The downgradient wells (G-3D and G-4)were sampled on 19 October,whereas the upgradient well (G-1) <br /> was sampled on 26 October. <br /> Methylene chloride was detected in both G-1 and G-3D. 1,2-DCA detected in G-3D at a low concentration <br /> estimated at 0.0822 µg/1. (1/1000`h of the values in the leachate samples at L-1 and L-2). Hexavalent <br /> chromium was also detected in both downgradient wells G-3D and G-4. These constituents should have <br /> been resampled;however, the county elected not to. Sampling during the IQ of 2000 indicated that the <br /> VOCs were not detected. Metals were not analysed for in 1Q 2000 and therefore,hexavalent chromium <br /> analyses must be completed again. The Public Health Goal for hexavalent chromium is 0.2µg/l. <br /> Schedule for the new well construction and sampling. <br /> RWQCB Staff Signature: l - <br /> Date: �2 �1 <br />