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' 15 September 2005 AGE-NC Project No 96-0229 ' Page 6 of 6 ' Based on the data collected during the first quarter 2005,additional ground water monitoring wells are not warranted at this time and the existing monitoring well network may be sufficient to complete a site Problem Assessment Report (PAR) ' Due to the significant northeastward MTBE and 1,2-DCA migration evident at well MW-9 over the past four quarters, AGE recommends installation and operation of an interim ground water ' extraction, pump-and-treat remediation system, utilizing EW-1 and additional extraction wells as needed,to inhibit further migration of dissolved petroleum hydrocarbon-impacted ground water off- site towards the east and northeast Remediation of the dissolved groundwater plume at 4511 Pacific Avenue, within 1,000 feet of the site, has proven generally successful at diminishing the lateral migration of contamination off-site and reduced the dissolved concentrations of petroleum ' hydrocarbons and MTBE AGE has tentatively made arrangements with Mr Mike Manassero,property owner at 4415 Pacific Avenue for installation of one ground water extraction well on his property An access agreement was mailed to Mr Manassero on 09 May 2005, a copy of the `signed' access agreement and a SJCEHD well permit application for the above mentioned extraction well is forthcoming AGE also recommends installation and operations of an interim soil vapor extraction (SVE) remediation system in the area of the highest petroleum hydrocarbon-impacted soil to inhibit further hydrocarbon-impacted soil (secondary source) from leaching into the ground water AGE will prepare an interim soil remediation work plan detailing design and operation of an interim(1)ground water pump-and-treat system and (2) SVE system 6.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by I environmental consultants practicing in this or similar localities The findings were based mainly upon analytical results provided by an independent laboratory Evaluations of the geologic/hydrogeologic conditions at the site for the purpose of this investigation are made from a limited number of available data points(e g ground water samples),and subsurface conditions may vary awav from these data points No other warranty, exnressed or implied is _mnde as to the professional interpretations, opinions, and recommendations contained in this report • Advanced GeoEnironmentai,Inc I