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Mr. John Jackson <br /> San Joaquin County Environmental Health Department <br /> 28 June 2004 <br /> Page 4 <br /> • Methyl test-butyl ether(MTBE)plus oxygenates (tert-butyl alcohol, di-isopropyl ether, <br /> ethyl-tert-butyl ether, and tert-amylmethyl ether, and ethanol) and lead scavengers <br /> (1,2-dichloroethane [1,2-DCA] and 1,2-dibromoethane [1,2-EDB]) using EPA Testing <br /> Method 826013, and <br /> • TotaI lead using EPA Testing Method 6010. <br /> As required, the analytical results for the samples have been reported to the SJCEHD directly <br /> from the laboratory via e-mail. Table 1 summarizes the analytical results. Sample detection <br /> limits were increased by the laboratory because of elevated TPH present in the samples. <br /> The analytical results indicated that TPHg (up to 5,800 mg/kg), TPHd (up to 560 mg/kg), <br /> ethylbenzene (up to 44,400 ug/kg), and total xylenes (up to 33,000 ug/kg) were detected in all <br /> samples. No concentrations of benzene, toluene, MTBE or oxygenates were detected in any <br /> samples. Lead was detected in all samples at concentrations which ranged between 5.1 mg/kg <br /> and 13 mg/kg. The laboratory analytical report is included as Attachment 1.. <br /> Fallowing the UST removal and sampling, soil excavation continued under the oversight of the <br /> DTSC and the SJCEHD. A total of approximately 3,800 cubic yards of soil was eventually <br /> excavated in the vicinity of the B-6 and B-9 location. This material was removed from the Site <br /> for disposal at an appropriate waste facility. The results of the additional excavating, <br /> confirmation sampling, waste disposal, and excavation backfilling work shall be included in a <br /> separate report. <br /> If you have questions or comments regarding please call. <br /> Sincerely yours, <br /> TREADWELL & ROLLO EDG. <br /> GES <br /> *. <br /> No. 7066 <br /> David G. Dix 4, R.G. Michael A. Chamberlain, R.G. <br /> Senior Geologist Senior Project Geologist <br /> 25971017.MAC <br /> Enclosures: Figure 1 —Site ap <br /> Figure 2—Area 15 RAP Excavations <br /> Figure 3 —B-6 UST Sample Locations <br /> Table 1 — Soil Sample Results <br /> Attachment 1 Laboratory Analytical Report <br /> cc: Lorraine Islas - City of Stockton <br />