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s <br /> Mr. John Jackson <br /> San Joaquin County Environmental Health Department <br /> 28 June 2004 <br /> Page 4 <br /> • Methyl tert-butyl ether (MTBE)plus oxygenates (tent-butyl alcohol, di-isopropyl ether, <br /> ethyl-tcrt-butyl ether, and Cert-am_yhnethyl ether, and ethanol) and lead scavengers <br /> (1,2-dicliloroethane [1,2-DCA] and 1,2-dibromoethane [1,2-EDB])'using EPA Testing <br /> Method 82608, and <br /> • Total lead usingl°A Testing Method 6010. <br /> As required, the. analytical results for the samples have been reported to the SJCEiD 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.5,800mg/kg), TPHd_(up-to.5.60 mg/kg); <br /> ethylbenzene(up to 44,000 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 /> Following the UST removal and sampling, soil excavation continued under the oversight of the <br /> DTSC mid the SJCEI D. A..fotal-of approximately 3,800'.cubic yards of soil_Was_eventually, <br /> e-ccavated-in tl;e�,iciiiity of the'.B-6.and.B-9.-location. This material was removed from the Site <br /> for dispos.d atanappropriate 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 ED QZ, <br /> .�.� fV�e <br /> David G. Dix1, R.G. Michael A. Chamberlain, R.G. <br /> Senior Geologist <br /> 25971fl17.1�AC N�9 �� , Senior Project Geologist <br /> Enclosures: Figure 1 —Site Map <br /> Figure 2--Area 1.5 RAP Excavations <br /> Figure 3 —B-6 UST Sample Locations <br /> Table 1 — Soi] Sample Results <br /> Attachment 1 Laboratory Analytical Report <br /> cc: Lorraine Islas - .City of Stockton <br />