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Union Ice - 3 - I 30 July 1991 <br /> I <br /> a depth of about 15 feet but no samples were collected at that depth. <br /> k However, the boring logs for both MW-4S andIMW-4D indicated soil <br /> r saturated with gasoline at about 16 feet. The northern extension of the <br /> excavation runs along the west side of the wells �but not on the eastern ' <br /> side. Soil/ground water contamination may remain below 15 feet and to <br /> the east of MW-4S and MW-4D yet no borings were proposed for the area. <br /> i <br /> My recommendations are as follows: 1� <br /> 1. Require that Union Ice submit the missing re�portsj� and information to the <br /> Regional Board; <br /> Ij <br /> 2. Request further explanation of the problems land questions noted above; <br /> 3• Require monthly ground water el <br /> evation measurements, quarterly ground <br /> water sampling and analysis, and quarterly submittal of monitoring <br /> reports; and I� <br /> 4. Approve borings as proposed <br /> but -request equest add�tzonal M <br /> borings east of MW-4S <br /> and MW-4D. <br /> Once additional information is available it it <br /> may be more apparent if a <br /> recommendation for abandonment of MW-4S and MW-4D should be made. If you have <br /> any questions, please call me at (916) 361-5726. <br /> I <br /> ; I <br /> ELIZAB TH A. THAYER <br /> Assoc rate Engineer <br /> EAT:d l c i. <br /> I <br /> �9999 I <br /> I� <br /> I� f II <br /> 4 i9 I� R <br /> I I' <br /> it <br /> I <br />