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H2OGEOLg <br /> ` A GROUNDWATER CONSULTANCY <br /> Mr. Muniappa Naidu May 10, 2007 <br /> Senior Registered Environmental Health Specialist <br /> San Joaquin County Environmental Health Department <br /> 304 E. Weber Avenue, Third Floor <br /> Stockton, CA 95202-2708 <br /> RE: Report on Tank Removal Related Soil Sampling— South of Joe's Travel Plaza, <br /> Northeast Comer Intersection Harlan Road and Thomsen Street, Lathrop, <br /> California. <br /> Dear Mr.Naidu; <br /> This Report on Tank Removal Related Soil Sampling is associated with two guesstimated <br /> 500 gallon single wall steel tanks at South of Joe's Travel Plaza, at the northeast corner <br /> of the intersection Harlan Road and Thomsen Street in Lathrop, California is submitted <br /> on behalf of Walton Engineering, Inc. <br /> The two tanks were said to have been installed prior to 1950 and,by an elderly passerby, <br /> to have been covered over in the late 1960s upon closing of"Wiggins Store." The two <br /> tanks were side by side and oriented approximately east-west. The tanks are referred to <br /> herein as North Tank, corresponding with Tank#2 in the Tank Removal Permit and <br /> South Tank, corresponding with Tank# 1. There was a small diameter, either 1 %< or I %2 <br /> inch, pipeline heading from each tank toward the west. Where these two pipes came <br /> together outside the tank removal excavation a fitted bend in the pipeline to the north <br /> occurred. This location was referred to as "PLS=Pipeline South." The open end of the <br /> two parallel and almost touching pipelines occurred a few feet to the north and was <br /> referred to as "PLN= Pipeline North." <br /> The two tank soil samples were collected approximately two feet in native soil beneath <br /> the center of the tank invert. The two pipeline soil samples were collected approximately <br /> two feet below the above designated locations. <br /> The top of the North Tank was partially collapsed and the about 30 percent of the tank <br /> capacity was filled with loose sandy soil. A sample of this material was collected and <br /> referred to as "Soil in N Tank." <br /> The sandy soil removed in uncovering the two tanks was stockpiled and was sampled as <br /> "Soil Stockpile." <br /> P.O. Box 2165 0 Livermore,California 94551-2165 ■ (925)373-9211 <br />