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Crossroads R/W and Suzanne Sullivan Real Property Services E29001.0IB <br /> Page 2 <br /> October 18, 1999 <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 /> I 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) g <br /> usin the U. S. EPA's Method 8082, for fuel oxygenates using the U.S. EPA method <br /> chromium Cr lead Pb , nickel <br /> Cd tri-valent chr ( tr), ( ) <br />� $260, <br /> and for the selected metals cadmium { ), � _ <br /> (Ni), and zinc (Zn) using the U.S. EPA's Method 5010, hexa-valent Chromium'(Crvj) usingthe <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 /> r TABLE 1 <br /> Underground Storage Tank Contents, Capacity, and Observed Condition <br /> Southwest Corner Lafayette:& E1 Dorado, Stockton CA <br /> UST Removal Action;September 20 and October 8, 1999.. <br /> UST UST Diameter Length Rated' Depth Observed Condition of Tank and <br /> Number' Contents feet feet Capacity, feet' Excavation <br /> 5125442 Unknown 4 10 950 5 Tank was rusty,4-foot diameter hole <br /> in west end.No odor or stains detected <br />+ in excavation. <br /> 27402 Unknown 5 12 1,800 6 Rusty with some pitting,no obvious <br /> holes. Strong petroleum odor and <br /> stains detected of 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 /> 1 <br /> r <br />