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R&B Trucking Addendum#2 Page: 2 Each monitoring well will be developed before a water sample is collected. This will be accomplished by pumping until clear ground water is obtained and then removing an additional 5 well volumes. One well volume is equivalent to the water contained in the well casing plus that contained in the pore spaces of the filter pack. The filter pack is assumed to have 25% porosity. The extracted ground water will be stored in 55-gallon drums until it is determined if the water is contaminated. Contaminated water will be treated at a later date. Before a water sample is collected from the well, 5 well volumes will be removed. A travel blank will be provided by the laboratory and blanks will be collected before sampling to insure bailer or pump cleanliness. Water samples will be collected by using either a polyethylene disposable bailer or a ground water pump(bladder pump). During the excavation of the tanks, Mr. Barenchi had the contractor extend the excavation both vertically and horizontally to remove the contaminated soil. The soil beneath the contaminated areas around tanks 1 and 5 (Figure 3) were excavated to a depth of 15 or 16 feet. At that point, ground water began filling in the excavation. This soil from the bottom of the excavation (-5 to 7 yd3) was stockpiled separately from the rest of the excavated soil. On 3 January 1990, Geological Technics collected two samples from this stockpile and submitted them to ChromaLab in San Ramon via GeoAnalytical Laboratories in Modesto. The samples were collected 18 inches beneath the surface of the stockpile and after being composited will be tested for TEPH. It is proposed that this work be performed as quickly as possible. In the event you have any questions,please give me a call. Sincerely, �w Raynold I. Kablanow 11, Ph.D. Geologist/Geochemist RIK:sm Enclosure