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GRI B I Associates Geological and Environmental Consulting Services <br /> 3 <br /> June 7, 1999 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Avenue, 3`d Floor <br /> Stockton, CA 95202 <br /> Attention: Margaret Legorio <br /> Subject: Workplan For Onsite Re-Use of Excavated and <br /> To Conduct Verification Soil Sampling <br /> Tiger Lines UST Site <br /> 927 Black Diamond Way, Lodi, California <br /> GA Project No. 161-01-01 <br /> Ladies and Gentlemen: <br /> Gribi Associates is pleased to present this workplan on behalf of Tiger Lines for the underground <br /> storage tank (UST) site located at 927 Black Diamond Way in Lodi, California (see Figure 1 and <br /> Figure 2). This workplan proposes: (1)The onsite re-use of stockpiled soil excavated during recent <br /> UST removal activities; and (2) Conducting soil sampling adjacent to the former dispenser island <br /> using hand auger equipment. The goal of proposed activities will be to dispose of stockpiled soil <br /> and conduct necessary soil sampling to address regulatory closure of this UST site. <br /> SITE BACKGROUND <br /> Three 10,000-gallon single-walled steel diesel USTs were removed from a common excavation by <br /> Bowen Construction-Engineering on March 12, 1999. Six soil samples (two per tank,taken at each <br /> end of the tank)collected by Mr. Jim Gribi, RG, at a depth of about 14 feet below surface grade in <br /> native soils contained no detectable levels of Total Petroleum Hydrocarbons as Diesel(TPH-D) and <br /> Benzene,Toluene,Ethylbenzene,and Xylenes (BTEX). Three soil samples were collected beneath <br /> the removed fuel dispenser island. One of these samples collected at two feet in depth on the north <br /> side of the removed dispenser island contained no detectable TPH-D and BTEX constituents. One <br /> sample collected at three feet in depth on the south side of the removed dispenser island contained <br /> 500 parts per million(ppm) and no detectable BTEX constituents. On sample collected at three feet <br /> in depth immediately west from the former dispenser island contained 1.5 ppm of TPH-D and no <br /> BTEX constituents. <br /> Approximately 260 cubic yards of soil was excavated during UST removal activities, with <br /> approximately 200 cubic yards stockpiled immediately south from the UST excavation cavity <br /> (Stockpile No. 1) and approximately 60 cubic yards stockpiled immediately east from the UST <br /> excavation cavity(Stockpile No. 2). Eight discrete soil samples were collected from Stockpile No. <br /> 1350 Hayes Street, Suite C-14•Benicia • Califomla • 94510•Phone(707)748-7743•fax(707)748.7763 <br />