Laserfiche WebLink
w <br /> F <br /> i' <br /> INTERIM REPORT ON <br /> SUBSURFACE INVESTIGATION AND <br /> z <br /> REMEDIAL PLANNING STUDY <br /> FOR <br /> FORMER MOBIL SERVICE STATION No, 10-NP4 <br /> 2375 TRACY BOULEVARD <br /> r , TRACY, CALIFORNIA <br /> INTRODUCTION <br /> This interim report presents the preliminary results and <br /> findings of field activities performed to date as part of the <br /> ongoing subsurface investigation and remedial planning study <br /> for former Mobil Service Station No. 10-NP4, located at <br /> 2375 Tracy Boulevard, Tracy, California. Specifically, this <br /> report presents only the results of: (1) monitoring and <br /> sampling of ground water, and (2) aquifer analysis and <br /> testing to obtain necessary design parameters. <br /> PROJECT BACKGROUND <br /> ,., A brief description of the site history and previous <br /> investigative work performed by others is presented in this <br /> section to provide an understanding of the project and <br /> ongoing work. <br /> F�. The project background was based on the previous reports <br /> prepared by Kaprealian Engineers, Inc. WEI) for the various <br /> investigative work on the site. <br /> Tank - <br /> 1986 <br /> Four underground storage tanks (two 10, 000-gallon, one <br /> 5,000-gallon, and one 250-gallon tank) were removed from the <br /> site or. August 19, 1986. Visual inspection indicated the <br /> tanks to be in good condition. Foliow;.,;g the removal of the <br /> tanks, soil and ground water samples w:-re collected. Ground <br /> water was encountered in the tank cavity at approximately <br /> 7 feet below grade. Three grab water samples were collected <br /> from the tank cavity and composited to one sample for <br /> E•... laboratory analysis. In addition, two soil samples were <br /> collected, one from the side wall of the waste oil tank <br /> excavation pit, at about 7 feet below the surface, and the <br /> other from beneath the product lines, at about 4 feet below <br /> the ground surface. <br />