Laserfiche WebLink
` s <br /> June 2, 2000 Harding Lawson Associate <br /> 50441 <br /> Margaret Lagorio, Supervising REHS <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> Page 3 - <br /> { <br /> will be used to transport the'soils in accordance federal; state, and local regulations. Over-excavation will be <br /> guided by subjective observations of soil discoloration and hydrocarbon odors as well as soil screening by a <br /> photo-ionization detector(PID). Confirmation samples collected after over-excavation will-be collected in <br /> locations designated by the PHS/EHD staff or a maximum frequency of one sample for 20 linear feet of y <br /> excavation sidewall. Samples will be collected in clean 6-inch long by 2-inch wide brass sample tubes from <br /> the excavator bucket. The sample tubes will be pounded.into the-soil in the bucket with a rubber mallet. <br /> ANALYTICAL PROGRAM <br /> Confirmation samples will be analyzed in accordance with page 8,Minimum Verification Laboratory <br /> Analysis of the PHS/EHD UST closure application package. The analytical suite will be that for an unknown <br /> fuel and will include the following: <br /> • Total petroleum hydrocarbons as gasoline(TPHg)with EPA Method 8260B, <br /> • Total petroleum hydrocarbons as diesel(TPHd)'with'EPA Method 8015M, <br /> • Benzene,toluene,ethylbenzene,and total xylenes(BTEX);and methyl tertiary butyl ether(MTBE),with <br /> EPA Method 8260B, and <br /> • Total lead with EPA Method 7421-(if detected in UST removal samples). <br /> However, because the USTs have not been used since prior to the early 1940s,HLA requests that the only <br /> required oxygenate analysis will be that for MTBE. As discussed above if detectable concentrations,of the <br /> COCs remain in the confirmation samples, analyses for the soluble fraction of the detected'COCs will be <br /> utilized in along with DLM;to determine if additional over-excavation is required. <br /> � i <br /> t _ <br /> REPORTING <br /> The results of the confirmation sampling wiltbe summarized along with other relevant information in the <br /> Closure Report that is to be submitted to the PHS/EHD UST group at the completion ofthe project. An <br /> additional copy of the Closure Report will be,submitted to Site Mitigation Group. <br /> si <br />