Laserfiche WebLink
f f 1"01 ` <br /> . • V <br /> GROUND ZERO ANALYSIS, INC. tt�i Ece VED <br /> 1714 Main,Street <br /> Escalon,California 95320-1927 2 2005 <br /> 'telephone:(209)83&9sss E ONA (yT FIE <br /> Facsimile:(209)838-"83PERAfifT1SERVICESTH <br /> April 28, 2005 <br /> Mr. Jeffrey Wong <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Soil Excavation Report and Site Closure Request <br /> City of Lodi,230 W. Elm Street, Lodi, California <br /> Dear Mr. Wong: <br /> This letter report is submitted on behalf of the City of Lodi to summarize the results of soil <br /> excavation and groundwater sampling activities conducted March 31 and April 7, 2005 at the above <br /> referenced site. The excavation was performed to remove soil impacted with methyl tertiary butyl <br /> ether(MTBE) in accordance with the workplan prepared by Jim Thorpe Oil, Inc., and groundwater <br /> sampling was conducted to confirm that groundwater beneath the site has not been impacted by <br /> petroleum hydrocarbon constituents. The site location is shown on Figure 1. <br /> BACKGROUND INFORMATION <br /> Underground Storage Tank Removal <br /> On February 17, 2005, Jim Thorpe Oil, Inc. removed one 12,000-gallon unleaded gasoline fuel <br /> storage tank (UST) and one 2,000-gallon diesel fuel UST from the rear parking lot of 230 W. <br /> Elm Street, Lodi, California. The USTs were removed under the supervision of Mr. Dennis <br /> Catanyag of the San Joaquin County Environmental Health Department (EHD). Soil samples <br /> were collected by GeoAnalytical Laboratories of Modesto, California under the direction of Mr. <br /> Catanyag. One soil sample collected from beneath the north end of the gasoline UST contained <br /> MTBE at 18,800 µg/kg (18.8 parts per million [ppm]) and total petroleum hydrocarbons as <br /> gasoline (TPHg) at 4,000 µg/kg (4.0 ppm). Due to the elevated level of MTBE in that soil <br /> sample, EHD requested additional investigation of the extent of MTBE in soil beneath the north <br /> end of the UST. Analytical results are summarized in Table 1. Field notes showing the locations <br /> of tank removal samples are included in Attachment A. <br /> Hydrogeological Setting <br /> The site is located in central Lodi approximately 0.9 miles south of the Mokelumne River. The <br /> G:\GROUNDZE\LODIFire\excsum.doc <br />