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�1--�, 1E U H20GEOLo A GROUND WATER CONSULTANCY PER. 011 S,Er;VlCtG i Mr. Muniappa Naidu May 10, 2007 Senior Registered Environmental Health Specialist San Joaquin. County Environmental Health Department 304 E. Weber Avenue, Third Floor Stockton, CA 95202-2708 RE: Report on Tank Removal Related Soil Sampling— South of Joe's Travel Plaza, Northeast Corner Intersection Harlan Road and Thomsen Street, Lathrop, California. Dear Mr. Naidu; This Report on Tank Removal Related Soil Sampling is associated with two guesstimated 500 gallon single wall steel tanks at South of Joe's Travel Plaza, at the northeast comer of the intersection Harlan Road and Thomsen Street in Lathrop, California is submitted on behalf of Walton Engineering, Inc. The two tanks were said to have been installed prior to 1950 and, by an elderly passerby, to have been covered over in the late 1960s upon.closing of"Wiggins Store." The two tanks were side by side and oriented approximately east-west. The tanks are referred to herein as North Tank, corresponding with Tank#2 in the Tank Removal Permit and South Tank, corresponding with Tank# 1. There was a small diameter, either 1 %4 or 1 'h inch, pipeline heading from each tank toward the west. Where these two pipes came together outside the tank removal excavation a fitted bend in the pipeline to the north occurred. This location was referred to as "PLS =Pipeline South." The open end of the two parallel and almost touching pipelines occurred a few feet to the north and was referred to as "PLN =Pipeline North." The two tank soil samples were collected approximately two feet in native soil beneath the center of the tank invert. The two pipeline soil samples were collected approximately two feet below the above designated locations. The top of the North Tank was partially collapsed and the about 30 percent of the tank capacity was filled with loose sandy soil. A sample of this material was collected and referred to as "Soil in N Tank." The sandy soil removed in uncovering the two tanks was stockpiled and was sampled as "Soil Stockpile." P. O. Box 2165 ■ Livermore, California 94551-2165 0 (925)373-9211