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Ms. Diane Hinson April 3, 1989 Page 2 to 24 inches laterally into the excavation sidewalls, at a depth of approximately 10 feet within the excavation, using a backhoe. If the excavation is dry, two bottom soil samples will also be taken at a depth of approximately 10 feet with a backhoe for TPH and volatile aromatic compound analyses. Samples will be collected from the backhoe bucket and placed in capped and sealed brass tubes. If standing water is present in the excavation, a water sample will be collected for total petroleum hydrocarbon and volatile aromatic compound analyses by EPA Methods 8015 (modified) and 602 using a stainless steel bailer. Although it is recognized that analysis of standing water within tt-ie excavation would not provide an accurate representation of groundwater conditions, it would provide some indication of chemical conditions and is therefore recommended. Soil samples from the tank excavation spoils will be collected with a stainless steel scoop for composi.ting in the laboratory and will be analyzed for total petroleum hydrocarbons by EPA Method 8015 (modified) and for volatile aromatic compounds by EPA Method 8015. Three composite samples, each comprised of soil collected at three points in the spoils pile, will be submitted for analyses. Soil and groundwater samples will be transported under chain-of-custody in a refrigerated ice chest to McLaren Analytical Laboratory in Rancho Cordova for laboratory analyses. The water surface elevations in the four existing monitor wells (11W-1 through MW-4) will be measured as part of the additional site assessment work to determine the current groundwater gradient. The proposed additional site assessment work described above is consistent with that requested by the Central Valley Regional Water Quality Control Board in a letter dated February 16, 1989 (see Attachment 1) . Results of the additional site assessment work will be submitted to the San Joaquin Local Health District and the Central Valley Regional Water Quality Control Board as an addendum to the January 1989 Site Assessment Report before any remedial work is undertaken at the site. Closure Attachment 1 which follows completes this addendum. We would like to request overtime review of this Preliminary Report Addendum and of the Ford New Holland Site Assessment Report, which was submitted to your office on January 6, 1989. Enclosed is the initial $52.50 overtime consultation fee. We understand that each additional hour of overtime review will be billed at the rate of $52.50 per hour. McLaren Environmental Engineering