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Page 5 <br /> Tracy Tire Fire <br /> Celeste Temple,Project Officer <br /> EPA Maximum Contaminant Level (MCL) was exceeded. <br /> GROUNDWATER SAMPLING ANALYTICAL RESULTS <br /> The START prepared a QASP for Emergency Soil and Water Sampling and collected <br /> groundwater samples on August 14, 1998 from three wells located on properties surrounding the <br /> site. There was no well sampled on the site. A private well at 30010 South MacArthur Road and <br /> industrial wells at Teichert Gravel Company and at RMC Lonestar Gravel Company were <br /> sampled. On March 12, 1999, the three wells were again sampled. Additionally, groundwater <br /> was sampled at a second residence located at 8952 West Palmquist upon the request of the <br /> residents who expressed concerns regarding their water quality. <br /> The groundwater samples were submitted to APPL, Inc. Laboratory in Fresno, California for <br /> definitive analysis of the following contaminants of concern: <br /> • VOCs using EPA Method 524.2; <br /> • SVOCs using EPA Method 525.2; <br /> • Phenols using EPA Method 604; and <br /> • Metals (Arsenic, Cadmium, Chromium, Lead, Zinc) using EPA Method 6010B. <br /> Validated, groundwater analytical results are summarized in Table 2 (attached). The chemicals <br /> listed in Table 2 are commonly identified toxins associated with tire fires (California Office of <br /> State Fire Marshall, Rings of Fire). The analytical results were compared to EPA Region 9 <br /> PRGs and MCLs. The California Secondary MCL was used for zinc. The analytical results were <br /> non-detectable for the contaminants of concern, except for the following: <br /> • Chromium in each of the samples collected from 30010 South MacArthur Road, <br /> Teichert Gravel Company, and 8952 West Palmquist; and <br /> • Lead in a sample collected from RMC Lonestar(first sampling event only). <br /> Only the lead concentration of 7.6µg/L in the groundwater sample collected from the RMC <br /> Lonestar well during the first sampling event exceeded an EPA PRG. Lead was undetected in <br /> the sample collected from this well during the second sampling event. The EPA Region 9 PRG <br /> for lead is 4 µg/L. No MCL was exceeded. <br /> It is important to note that there is no available well construction information for any of the four <br /> wells sampled. Therefore, it is uncertain whether any of the wells are screened in the uppermost <br /> groundwater that would be the first hydrologic receptor of contamination. <br /> 1:\000610\S F389_0339TTRZXXUTTzur30.799.wpd <br /> 10/17/99 6:56 PM <br />