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f <br /> t J. <br /> INTERIM WO PLAN: <br /> AIR SPARGING PI OT TEST <br /> Lammersville Elemen ry School <br /> -� 16555 W. Von Sosten Road <br />�- Tracy, Califorida <br /> September 1994 <br /> 1.0 INTRODUCTION <br /> In accordance with a request from Mr. Kenneth Ods of the Lammersville School District <br /> (LSD), Geological Audit Services, Inc. (GeoAudit) has prepared this work plan to design <br /> and implement an in-situ air sparging (IAS) pilot test at 16555 W. Von Sosten Road in. <br /> Tracy, California (the site). The work plan includes the installation of one additional <br /> monitoring well. The location of the site is illustrated in Figure 1. A plan of the site is <br /> illustrated in Figure 2. <br /> jr 2.0 BACKGROUND <br /> r. <br /> 2.1 Site Description <br /> The site is located at the northwest corner of the intersection of Von Sosten Road and <br /> Hansen Road in a rural area northwest of Tracy, C lifomia. The property is approximately <br /> 10 acres in size and is occupied by Lammersville Elementary School. A maintenance garage <br /> and house are located near the northeast corner oft e site; two storage tanks were formerly <br /> located in this area. The tanks were used to fuel school vehicles. The Lammersville <br /> Elementary School yard is located to the west and oath of the project area. <br /> .p <br /> 2.2 Underground Storage Tank (UST) Removal <br /> LSD operated one 550-gallon regular gasoline and rground storage tank (UST) and one <br /> 2,000-gallon diesel UST at the site. The gasoline tank was removed from the site in <br /> December 1986; the diesel tank was removed in March 1989. Samples collected from <br /> beneath the gasoline tank indicated that an unautho 'zed release of hydrocarbons may have <br /> occurred. However, according to LSD, samples collected from beneath the diesel tank <br /> "showed no contaminants," but the San Joaquia County Public Health Services - <br /> Environmental Health Division (PHS/EHD) required groundwater samples of the area to <br /> determine if an unauthorized release of diesel had xcurred. <br /> c�io�i aas.rv;�..log. <br /> 10069-96.M1AMME_'RM r c Wpl 1 <br /> F_ <br />+ <br /> 7 <br /> t <br />