Laserfiche WebLink
r <br /> I� <br /> I' <br /> Mr. Mike Hansen 1; -2- 18 September 1987 <br /> 6- A summary table of the history of operation, pumping <br /> rates, efficiency, etc. of the recovery system should <br /> be included. i <br /> k <br /> 7- Some explanation should be provided as to why MW-17 and <br /> 18 have shown significa t decreases in contamination <br /> but not MW-16.1` <br /> 8- Monitor wells ;�16, 17, an 18 apparently were not found <br /> during one sampling visit because they were buried in a <br /> plowed field.. Monitor wells drilled in similar <br /> locations should be completed in such a way that they <br /> are easily found for sampling. <br /> 9- Table 1 says RW-1 does not exist. Has it been plugged <br /> and abandoned ;already? If so, how was it abandoned? <br /> �10 Sample and analyze the on-site water well at the same <br /> frequency as monitor wells. <br /> 11- Sample and analyze off-site wells 73823 , 16333, 31989, <br /> and 73784 quarterly. <br /> 12- Thickness of contaminated ground water can not be <br /> determined with existing monitor wells. Wells with <br /> short screens over discrete intervals (piezometers) <br /> would be necessary to do this. <br /> 13- Prepare a map .-Showing what the site will look like when <br /> the new wells are completed (since several of the j <br /> "wells" do not reach the ground water they should be <br /> labeled differently than those that do) . Indicate <br /> which wells are completed in Zone 3 and which are <br /> completed 'in Zone 5. <br /> 14- Please analyze for soil and ground water TPH by <br /> modified 8015 :using fused capillary columns with GC/FID <br /> and prepped byemethod 5030. r <br /> I <br /> IN SITU BIOREMEDIATION ISB : <br /> As we have discussed in the past, enhanced biodegradation <br /> for aromatic and ::straight chain hydrocarbons can be an <br /> efficacious method',' for remedial treatment of contaminated <br /> soils and ground water. Your plan seems to follow basic <br /> protocol for such treatment. <br /> We have a few questions and comments for you to consider <br /> prior to start up of the program: <br /> 1- You are planning to use hydrogen peroxide as the <br /> oxygen source. Because peroxide is toxic to the <br /> .9 <br />