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1_. <br />Crossroads R/W and Suzanne Sullivan Real Property Services E29001.0111 <br />October 18, 1999 Page 2 <br />on October 8, 1999. These two soil samples were combined into one "composite" sample in the <br />laboratory for testing. After the soil samples were collected, the ends of the sleeves were <br />covered with Teflon® tape and secured with plastic end caps. The sleeves were labeled and <br />placed in a cooled ice chest for shipment to Twining's state -certified analytical laboratory. <br />Chain -of -custody documentation and a site plan showing the soil sample locations are attached. <br />ANALYTICAL PROCEDURES <br />The soil samples collected beneath the USTs were analyzed for benzene, toluene, ethyl -benzene, <br />xylenes (BTEX), and methyl tertiary -butyl ether (MTBE) using the United States Environmental <br />Protection Agency's (U. S. EPA's) Method 8021, and total petroleum hydrocarbons -gasoline <br />range (TPH-G) and total petroleum hydrocarbons -diesel range constituents using the gas <br />chromatography/flame ionization detection (GC/FID) method, for poly -chlorinated biphenyl <br />(PCB) using the U. S. EPA's Method 8082, for fuel oxygenates using the U.S. EPA method <br />8260, and for the selected metals cadmium (Cd), tri -valent chromium (Crm), lead (Pb), nickel <br />(Ni), and zinc (Zn) using the U.S. EPA's Method 6010, hexa -valent Chromium (Cry using the <br />U. S. EPA's Method 7196A, and volatile halogenated organic compounds using the U. S. EPA <br />Method 8021. Sample analyses were specified by the SJCPHS on-site representative. <br />SUMMARY OF OBSERVATIONS AND ANALYTICAL RESULTS <br />The former contents of the tanks were unknown. Approximate tank capacity, and observations <br />made by Twining at the time of the tank removal are summarized in Table 1. <br />TABLE 1 <br />Underground Storage Tank Contents, Capacity, and Observed Condition <br />Southwest Corner Lafayette & El Dorado, Stockton CA <br />UST Removal Action, September 20 and October 8, 1999 <br />UST <br />UST <br />Diameter <br />Length <br />Rated <br />Depth <br />Observed Condition of Tank and <br />Number' <br />Contents <br />feet <br />feet <br />Capacity' <br />feet' <br />Excavation <br />5125442 <br />Unknown <br />4 <br />10 <br />950 <br />5 <br />Tank was rusty, 4 -foot diameter hole <br />in west end. No odor or stains detected <br />in excavation. <br />27402 <br />Unknown <br />5 <br />12 <br />1,800 <br />6 <br />Rusty with some pitting, no obvious <br />holes. Strong petroleum odor and <br />stains detected at east end. <br />NOTES: <br />UST = Underground Storage Tank <br />1 = Number assigned by the SJCPHS <br />2 = approximate <br />3 = Depth of bottom of tank below site grade <br />