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s <br /> Mosquito Abatement <br /> 1 Page 2 <br /> PHSIEHD fled a Notification of Hazardous Waste Dischar a {Pro 65 on February 3, <br /> g:. p ) ry <br /> 1992 stating that the site was placed into the Local Oversight Program (LOP) and <br /> that additional site assessment was required to deterr l,ine the nature and extent of <br /> j 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. PHS/EHD 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 /> 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 /> i <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 /> installed tanks' monitoring system which reportedly is encased in fiberglass conduit <br /> without any metalized markings for detection. <br /> PHSIEHD i� <br /> � also stressed the importance that the laboratory used for analysis achieve <br /> approved detection limits for soil and groundwater as outlined in regulatory <br /> guidelines. <br /> I <br /> PHSIEHD indicated that a summary of all the prior soil,andgroundwater analytical <br /> results from the tank removals, over-excavation, soil borings',,groundwater monitoring <br /> wells and hydropunches should be prepared and submitted immediately. As was <br /> agreed during our meeting a corrective action plan, as'loutlirFed 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. fi Also, you may be asked <br /> to install additional monitoring wells in the area of the former tank pit to replace wells <br /> which were destroyed. <br /> I <br /> , <br /> 7759 South Airport <br /> Current Tank Status <br /> Tank # Contents Size .i Status <br /> 1798-1 larvicide oil 8,000 gal !j Removed 3/13/1987 <br /> 1798-2 weed oil 8,000 gal Removed 3/13/1987 <br /> { 1798-3 regular gas 6,000 gal Removed 3/13/1987 <br /> 1798-4 aviation fuel 12,000 gal i Removed 3/13/1987 <br /> 1798-5 unleaded gas 2,000 gal Removed 5/29/1987 <br /> 1798-6 unleaded gas 1,000 gal fi .Removed 5/29/1987 <br /> 1798-7 aviation fuel 8,000 gal �k lbstalled 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 i Installed 4/20/1987 <br /> �i - l <br />