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..F. 4 <br /> s <br /> 0581 BEEN <br /> IM <br /> F <br /> KEI-P91-0202.R5 <br /> October 16, 1991 <br /> Page 7 <br /> DISCUSSION AtdD RECOMMENDATIONS <br /> on Of <br /> Based on the analytical results, <br /> e program ram oflthecommendng wells EnThe�wel .ls <br /> a monitoring and sampling and should be purged and <br /> should be monitored on a monthly basThelproposed program should be <br /> sampled on a quarterly basis. <br /> sults of. <br /> conducted for a period of 12 months. The reenteanthe monitoring <br /> luaed after each monitoring and <br /> program will be d cumRecommendatiansafort altering or terminating the <br /> sampling event. <br /> program will be made as needed. <br /> In addition, the subject site has been tentatively scheduled for <br /> divestment by Unocal. Aithough KEI would normally recommend <br /> he existing wells for <br /> collecting monitoring and sampling data from add additional subsurface <br /> at least one quarter before proposing Y round water flow <br /> work at the site (in order tc verify the dominant <br /> relatively consistent <br /> direction at the site, and to establish <br /> the existing wells) , <br /> level of hydrocarbon contamina�aQ ewithin environm ntal character- <br /> Unocal has instructed KEI to exp work plan for additional <br /> of <br /> ization this site. Therefore, a our review and <br /> subsurface work at the site is attached for y <br /> consideration. <br /> Lastly, wells MW1, MW2, and Mw3 are recommended to be redeveloped <br /> during the next quaitei, due to observations made during recent <br /> ground water sampling activities that indicated the presence of <br /> some sand and silt materials at the bottom of the well casings. <br /> DISTRIBUTION in <br /> of this report should be sent tothe San yu <br /> A copy Region. <br /> Local Health District, and to the RWQCB, Central Valle <br /> LIMITATIONS <br /> deposits and rock formations may vary in thickness, lithologI� <br /> Soil site. <br /> saturation, strength and other properties <br /> snaturally occurring or <br /> addition, environmental changes, <br /> artificially-induced, may cause <br /> hechextentla d con entration ground water of any <br /> flow paths, thereby changing <br /> contaminants. Our studies assume that the field and labaratand <br /> data are reasonably representative of the site as a whole, <br /> assume that subsurface conditions are reasonably conducive to <br /> interpolation and extrapolation. <br />