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Mosquito Abatement <br /> Page 2 <br /> i PHS/EHD filed a Notification of Hazardous Waste Discl%arge ;(Prop 65) on February 3, <br /> 1992 stating that the site was placed into the Local Oversight Program (LOP) and <br /> that additional site assessment was required to determi''6 the nature and extent of <br /> contamination. Subsequently, on February 10, 1994, you received notification that <br /> the site was placed into the LOP and that additional soil remediation would be <br /> necessary. PHSIEHD also suggested that the dry monitoring wells could be used for <br /> vapor extraction and requested that an additional monitoring ',well be installed. <br /> A fourth monitoring well was installed on June 14, 1992,in a 'suspected downgradient <br /> . g <br /> direction. While groundwater contamination was not detected, this well is located <br /> approximately 100 feet away from the area where soil contamination is evidenced. <br /> During July 1994, additional soil and groundwater investigation occurred and further <br /> evidenced soil contamination to 50 feet below ground surface. Also monitoring wells, <br /> MW2 and MW3 were destroyed. <br /> You stated that barriers to the investigation of the former tank area were the newly <br /> Y <br /> installed tanks' monitoring system which reportedly is encased in fiberglass conduit <br /> without any metalized markings for`detection. !!° <br /> PHSIEHD also stressed the importance that the laboratl� used for analysis achieve <br /> P rY Y <br /> approved detection limits for soil and groundwater as o'�"tlined in regulatory <br /> IE guidelines. <br /> PHS/EHD indicated that a summary of all the prior soil and groundwater analytical <br /> results from the tank removals, over-excavation, soil borings,'groundwater monitoring <br /> .i <br /> wells and hydropunches should be prepared and submitted immedsat 1 a y. As was <br /> agreed during our meeting a corrective action plan, as outlined in the California Code <br /> of Regulations, necessary to remediate the residual soil��'contamination which poses a <br /> threat to groundwater, shall be submitted by April 15, 1995. Also, you may be asked <br /> h area of the former'+tank it to replace wells <br /> to install additional monitoring wells in the p p <br /> 9 <br /> which were destroyed. <br /> 7759 South Airport i <br /> Current Tank Status <br /> Tank # Contents Size ��` Status <br /> 1798.1 larvicide oil 8,000 gal Removed 3/13/1987 <br /> 1798-2 weed oil 8,0009 al Removed 3/13/1987 <br /> 1798-3 regular gas 6,000 gal kemoved 3/13/1987 <br /> 1798-4 aviation fuel 12,000 gal ; Removed 3/13/1987 <br /> 1798-5 unleaded gas 2,000 gal '! Removed 5129/1987 <br /> 1798-6 unleaded gas 1,000 gal Removed 5/29/1987 <br /> 1798-7 aviation fuel 8,000 gal Installed 4/20/1987 <br /> 1798-8 unleaded gas 6,000 gal Installed 4/20/1987 <br /> 1798-9 larvicide oil 8,000 gal Installed 4/20/1987 <br /> 1799.10 larvicide oil 8,000 gal Installed 4/20/1987 <br />