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r <br /> United Parcel Service <br /> 02320 1837 December 6, 1991 <br /> Page 2 <br /> Copies of the laboratory analyses reports and the sample chain-of-custodies are included in Attachment <br /> B of this letter and are summarized in the following table. <br /> CONSTITUENT SAMPLE IDENTIFICATION <br /> W-1 SP-1 _1 9-2 9-3 <br /> Benzene <0.005 0.0055 0.0050 <0.005 <0.005 <br /> Toluene 0.027 0.21 0.013 0.021 0.010 <br /> E-benzene <0.005 0.17 <0.005 <0.005 <0.005 <br /> Xylenes 0.0067 1.9 0.016 <0.005 0.058 <br /> TPH-G 37 <0.5 <0.5 <0.5 <br /> TPH-D <10 <br /> TPH-Motor Oil <10 <br /> Organic Lead <0.005 <0.005 <0.005 <0.005 <br /> VOC ND . <br /> Semi-VOC ND <br /> Total Lead 3.0 16 6.6 5.9 5.0 <br /> EDB -- <0.02 <0.02 <0.001 <0.001 <br /> Hex. Chrome <0.5 <br /> All values are in mg1Kg or parts per million (ppm). <br /> IIID = not delectable; analyses performed for numerous compounds with differing detection limits. <br /> See Attachment B for laboratory reports. <br /> Based upon the laboratory results from the tank removal operation shown above, portions of the <br /> excavation for the unleaded gasoline tank were over-excavated on November 13, 1991 to remove the <br /> remaining hydrocarbon impacted soils. Figure 5 (Attachment Ay shows the limits of the over- <br /> excavation. On November 1471991, Groundwater Technology collected additional soil samples from <br /> the locations shown on Figure 3 (Attachment A). These samples were designated G-1A, G-2A, and <br /> G-3A from the excavation and SP-1A and SP-2A from the additional stockpiled material. These <br /> samples were analyzed to verify that the hydrocarbon impacted soils had been removed. Soil samples <br /> gathered during this second round of sampling were analyzed for BTEX and TPH-G by an on-site mobile <br /> laboratory. These samples were also sent to GTEL Environmental Laboratories in Concord, California <br /> for analysis of total lead content. No metals or hydrocarbons were detected in any of the soil samples. <br /> Copies of the actual laboratory analysis along with the sample chain-of-custody are included in <br /> Attachment C. The results of the over-excavation sampling are shown on the following table: <br /> CONSTITUENT SAMPLE IDENTIFICATION <br /> G-1A G-2A G-3A SP-1A SP-113 <br /> Benzene <0.005 <0.005 <0.005 <0.005 <0.005 <br /> Toluene <0.005 <0.005 <0.005 <0.005 <0.005 <br /> E-benzene <0.005 <0.005 [0.005 <0.005 <0.005 <br /> Xylenes <0.015 <0.015 <0.015 <0.015 <0.015 <br /> TPH-G <1.0 <1.0 <1.0 <1.0 <1.0 <br /> Total Lead <5 <5 <5 --All values are in mg/Kg or parts per million (ppm). <br /> See Attachment C for laboratory reports. <br /> H El GROUNDWATER <br /> TECHNOLOGY,INC. <br />