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Work Plan Addendum <br /> May 1998 <br /> SIERRA LUMBER <br /> 375 West Hazelton Avenue, Stockton, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr. Bob Long of Sierra Lumber,Advanced GeoEnvironmental, <br /> Inc. (AGE) has prepared the enclosed Work Plan Addendum for 375 West Hazelton, Stockton, <br /> California(the site). This work plan details procedures for the installation of four additional ground <br /> water monitoring wells and performance of a well/sensitive receptor survey. The location of the site <br /> is illustrated on Figure 1-Location Map. A plan of the site is illustrated on Figure 2 -Site Plan. <br /> This work plan addendum was prepared in accordance with San Joaquin County Public Health <br /> Services -Environmental Health Division(PHS-EHD) and Central Valley Regional Water Quality <br /> Control Board guidelines for investigation of underground storage tank (UST) sites. <br /> 2.0. BACKGROUND <br /> 2.1. SITE DESCRIPTION <br /> The site is located in a topographically flat area of west-central Stockton on West Hazelton Avenue <br /> between Lincoln and Monroe Streets. The property is currently occupied by a lumber manufacturing <br /> facility. The facility consists of several warehouse buildings used for the manufacture and storage <br /> of lumber. An above-ground storage tank is currently located on the northwest portion of the <br /> property. <br /> 2.2. UNDERGROUND STORAGE TANK REMOVAL <br /> In August 1988,one 1,000-gallon gasoline UST was removed from inside the eastern warehouse(see <br /> Figure 1). Upon removal of the UST,two samples were collected from the floor of the excavation: <br /> UST-1 was collected from a depth of 9 feet below surface grade (bsg); UST-2 was collected from <br /> a depth of 15 feet bsg. <br /> Total petroleum hydrocarbons quantified as gasoline were detected in UST-1 and UST-2 at <br /> concentrations of 790 and 1,200 milligram per kilogram (mg/kg or parts per million: ppm), <br /> respectively. <br /> Advanced GeoEnvironmental,Inc. <br />