Laserfiche WebLink
r �- <br /> M <br /> t. <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> September 30, 2004 <br /> Ms. Margaret Lagorio <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Results of Subsurface Investigation <br /> 601 Lockeford Street, Lodi, CA <br /> Dear Ms. Lagorio: <br /> On September 15, 2004 Ground Zero Analysis, Inc. (Ground Zero) performed a subsurface <br /> investigation at the subject site. Figure 1 ,shows the location of the project site. Ground Zero <br /> conducted the investigation to determine if past use of the property as a retail gasoline and <br /> automobile service station has impacted soil and/or groundwater beneath the site. <br /> BACKGROUND <br /> From the information. provided by Mr. Larry Howen and through discussions with the San <br /> Joaquin County Environmental Health Department (EHD) it is our understanding that the facility <br /> previously operated four underground gasoline storage tanks -(USTs) and one waste oil UST. <br /> Figure 2 presents a site plan showing the approximate location of the former USTs and dispenser <br /> islands. The USTs and dispensers were removed under permit from EHD in July 1986. <br /> SITE ACTIVITIES <br /> Ground Zero supervised the advancement of six soil borings at the subject site on September 15, <br /> 2004. The first boring was advanced using a Geoprobe 5400 direct-push drilling rig by Fisch <br /> Environmental (C57-683865). However, at 14 feet below the ground surface (bgs) the drilling <br /> rig encountered rod refusal in the compact soil. Fisch mobilized a larger Geoprobe 6600 direct- <br /> push rig to complete the borings. <br /> Borings SBI, S134, and S135 were drilled to a depth of approximately 20 feet bgs through the former <br /> excavation that housed four gasoline USTs. SB2 and S133 were drilled to a depth of approximately <br /> 10 feet bgs in the vicinity of the former dispenser islands (one at each location). S136 was drilled to <br /> a depth of approximately 20 feet bgs in the location of the former waste oil UST. The borings were <br /> G AGROUNDZE\Howen\SBrcport.doc <br />