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r � _ �y _ PRE-TANK REPLACEMENT SITE AsSESSMENT s - RESULTS REPORT 1605 S.EI Dorado,Stockton.:aldorna Page Z i' o Soil samples were recovered at five foot intervals (along the 300 angle) from the soil borings beginning at the first five foot auger break. Soil sampling was performed in accordance with Aegis Standard Operating Procedure (SOP) , App endixa Soil samples were recovered in brass tubes and soil samples were classified according to the Unified Soil Classification was made in System. a w�th1Aeeis'150P of each The logs oil are included as Appendix accordant g !x A. 1,-3 o Soil samples recovered from the soil borings were screened for } the presence of organic vapors with an hNu portable photoionization detector. The highest vapor reading from each sample was recorded on the soil boring logs. 0 Based on the results of classification and screening, a total of six soil samples from each soil boring were placed under a °'. chain-of-custody, secured in a sealed ice chest and submitted to a state-certified laboratory for analysis, in accordance with Aegis' SOP. { � o The samples were submitted for a fuel-fingerprint analysis. rr Results were reported for concentrations of total prgeable toluene, petroleum hydrocarbons (TPPH) as gasoline, benzene, toluene, ;:1lenes and ethyl benzene, (BTX&E) , ethylene dibromide (EDB) and 1,2-dichlornathane (EDC) by GCIHS, EPA methods 8240/5030. In addition, total lead constituents were analyzed by Flame AA, EPA method 7420. the soil borings were grouted 0 Upon completion of the drilling, The routing i.., to the surface with a 9-sack cement/sand slurry. g pwas inspected by a representative of San Joaquin County Public Health Services. it 0 Drill cuttings were placed on and covered by visquene. The stockpiled cuttings were composite sampled to classify them for disposal purposes. approved " 0 Rinsate water was stored temporarily on site in DOT 55-gallon drums. T g0.2p56.RFT f ,;