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�i <br /> 4 01 May 2007 <br /> AGE-NC Project No. 07-1516 <br /> Page 36 of 39 <br /> • A Former Disc rge Area Investigation Report was performed by Weston, Inc. and dated <br /> 29 August 1989. e recommendations from the 1989 Weston report noted that since soils <br /> were predomipdtely fine textured and laterally contiguous and that the ground water yield <br /> was very limited, the soil had low permeability and transmissivity. These hydraulic <br /> conditions,coupled with the known low mobility of organochlorine pesticides found in soil, <br /> suggested that the migration of perticide and herbicide compounds through the soil was <br /> unlikely. It was recommended that an annual ground water monitoring program be initiated <br />.r utilizing the three existing monitoring wells and that the wells should be sampled for <br /> organochlorine and carbamate pesticides. The monitoring program would ensure that no <br /> significant chemical migration occurred and would serve as a routine assessment of site <br /> conditions. No further remedial actions were recommended, noting that remediation costs <br /> would over-weigh any benefit gained by the removal of the low-residue soil. <br /> • The CVRWQCB accepted the Weston recommendations and noted that due to low levels of / <br /> pesticides and herbicides found in soil,no further soil remediation or removal was required. <br /> • The CVRWQCB instituted ground water monitoring in 1990; after two monitoring events / <br /> in 1991, the CVRWQCB stated_th. e monitoring requirements for the property were <br /> completed. <br /> • A large amount,/of hazardou terials, iicluding drums of oil and waste oil, paints, <br /> pesticides and other container wa store nside the metal hangar,usually on pallets. Some <br /> staining of the dirt flooring was ote . <br />_ <br /> • A Site Inspection Report prepared by URS Consultants and—" 26_May 199.2not Zn., <br /> addition to known contaminant areas that a chemical batch unit d holding .t were1 . <br />_ located outside the office/shop/hangar en ine oil maintenance was per <br /> parking strip, chemical/barrel storage areas re located east from the parking strip and <br /> adjacent to the metal hanger, two empty USTs ere located on the property, one (aviation <br /> gasoline) within the airplane-parking stripanfd one east from the southern hangar and that <br /> four ASTs were located on the property, three stored from a nearby former service station <br /> and one used to hold fuel when the USTs were emptied. AGE notes that the UST near the <br /> parking strip was removed in 1992 and is a closed case and has no information concerning <br /> /eyr the.-DIST near the ffietal hangar or the four ASTs. <br /> • / Three 6,000-gallon USTs(two aviation fuel one unleaded gasoline)we remov 1 om the <br /> ��itcrin June 1989 without SJ <br /> CF CEHD a rrmits.AGE has no direct knowledge at investigations <br /> of the tank pit area have been performed; the UST location appears to have been northwest <br /> from the now-demolished hangar/office building, but this is not certain. A SJCEHD permit <br /> worksheet from 1990 shows three 6,000-gallon USTs, but no removal documentation. <br /> Advanced GeoEnviron mental,Inc. <br />