Laserfiche WebLink
. <br /> '_.3m-v,� <br /> 2`•- ,`'g•. �«'�sW- � �}»s'` � Y� -�.���'�.y � ��°�S.'�� a �.�.�.`� � �";- �" 'y�"�.d "� Ct-. �.�':a'°» r ,?i " � �' s ���.5"i� "'.��'r*"��' �;-� <br /> - �! xs �a- �-��, ,y t'�r s �5.r�-'�n.�' e .'�T. y,''&'p"� �f�4'X- r�'-�- - � r�� ��5.�'-€+�•,3� ;?".,`` �: ";�r : <br /> 3 <br /> tom, <br /> r <br /> App/lcd GooSyslein <br /> • fKfNl 7.^:I • IV.Vi'.1 • Ili ll'tiIl)% • I!Otilf)N 11f NIt) • t t'i1'LR CEI •}Iti lr)ti# <br /> i Mav 3, 1991 <br /> 0214rsis <br /> AGS 38032-6 <br /> I <br /> e <br /> Mr. Rick Sisk <br /> Unocal Corporation <br /> F.O. Box 5155 <br /> San Ranson, California 94583 ; <br /> Subject: Status of Environmental Investigation at Unocal Service Station No. 6981, <br /> 4707 Pacific Avenue, Stockton, California. <br /> Mr. Sisk: <br /> i <br /> At the request of Unocal Corporation, Applied GeoSystems, Inc. (Applied GeoSystents) is j <br /> writing to report the status of the environmental investigation at the subject site. The <br /> location of the project site is shown on the Site Vicinity Map (Plate P-1). 1 <br /> I <br /> Previous Work j <br /> Appiied Geo;ystems conducte,.i an initial investigation in May and June 1988 in conjunction IIE <br /> j with the removal and replacement of gasoline-storage tanks (Applied GeoSystems, July 8, E <br /> 1988. Report No.38032-1). Results of field work and laboratory analyses indicated gasoline !I <br /> i,ydrocarbons were present in soil under the former tanks. In December 1988, we <br /> performed a soil-vapor survey and results indicated low levels of gasoline hydrocarbons were <br /> present in vapor in one probe hole near the southwest corner of the site. On the basis of <br /> these results, Unocal requested an investigrtion of the soil and ground water beneath the <br /> site. <br /> I <br /> During January and February 1990,five soli borings and five monitoring wells were installed <br /> at the site. The locations of the monitoring wells are shown on the Generalized Site Plan <br /> (Plate P-2). Soil sample results indicated detectable concentrations of hydrocarbons <br /> remained in the soil. Water sample results indicated detectable concentrations of dissolved <br /> hydroc:,rbons,nitrate and total and fecal coliform bacteria were in the ground water beneath k <br /> the site. We recommended *Initiating the quarterly monitoring program performing <br /> additional work to assess hydrocarbons in the soil, and conducting a vapor-extraction test I <br /> to evaluate the feasibility of remediating the soil and water-bearing tone (Applied <br /> -GeoSystems; in progress, Report No.38032-3). <br /> i <br /> 111MI PRE <br />