SITE INFORMATION AND CORRESPONDENCE

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1-2d-1996 d: 15PM FROM n- NEILL-INvESTIOATIV 7986050 P Z On December 11, 1995 a representative of PHS-EM was notified by Wright of the discovery and removal of a petroleum fuel tank by the trust. on'Deceather 13, 1995 Wright deposited the appropriate fees associated with UST removal with representatives of the PHS-EHD on behalf of the trust Scope of Work The Scope of work includes: • Site Recamiaissanoe • Site History Review •Regulatory Agency Records Review .Prepatation and excavation of workpIans for submittal to regulatory agencies •Docur neQnmion of the location of observed containers and their appurtenances •Sample collection and laboratoranalysis ofoof sod id groundwater •Excavation,characterization, Technical Approach The tank pit has filled with approximately 4 to 5 inches of water (approximately 300 gallons) which may reflect the natural water table, be the result of recent storm events or tidal influence from the adjacent waterway near the island. Wright will purge the water from the pit place it in a temporary holding tank(about 1300 gallon capacity)Label the tank and allow the pit to recharge prior to the collection of water samples freta the pit and the tank If the water samples reveal detectable concentrations for the contaminants analyzed for, Wright will prepare a separate workplan to determine the extant of contamination of groundwater. Purge water that does not onn detectable cencentratiorns os potential contaminants will be used as irrigation water for the island Purge water that does contain detectable concentrations of the potential contaminants will be prgx:ly transported to a licea9ed disposalltecyclingfwcility. Wright personnel will meet with PHS-EHD representatives at the site and collect the appropriate number of soil and groundwater samples as required for a 500 gallon UST and from other locations deemed necessary by PHS-El D. Soil samples will be collected using hand auger and 2" brass sample sleeves. The sample auger will be cleaned between each sample collection event Soil samples will be covered with Teflon 'r" film and covered with a plastic end caps. The samples will then be labeled,logged onto a chain of custody, placed inside a Ziploc TM bag,and placed inside a chilled ice cooler for transport to Priority Environmental Labs of Milpitas, CA,a state-certified laboratory for chemical analysis. Groundwater samples will be collected in appropriate sized containers,labeled,and documented as noted above. The collected samples will be analyzed as required when the last contents are unknown •Total Petroleum Hydrocarbons as C+asoliwMl5m •Total Petroleum Hydrocarbons as Diesel=Om •Benzene,Toluene,Ethyl Benzene,and XyleneMM •Total Lead16010 Soil Excavation .and Removal If it is determined after reviewing laboratory analysis of the sampling event described above that additional soil excavation is required or appropriate Wright personnel will excavate to the limits necessary to assure contaminants analyzed for are removed and confirmed through additional analyses. Additional excavation will be performed with Wright equipment and personnel using a small backhoe and or a front end loader. The stockpiled Soil on site (approximately 20 cubic yards) and any additional soil removed from the tank pit will be sampled and analyzed (as stated above) at a rate of one-four point composite (laboratory composite) for each 50 cubic yards of material excavated,as required for disposal at Waste Management,Altamont ILII and Resource Recovery Facility in Livermore, CA.