Laserfiche WebLink
F:S <br /> 1 <br /> f-d <br /> PRE-TANK REPLACEMENT SrtEA55ESSMENT <br /> �. RESULTS REPORT <br /> 1605 S.0 Dorado,Stockton.CaINOML2 <br /> Page 4 <br /> c� <br /> �.a <br /> California for analysis. Copies of the analytical laboratory <br /> reports are included in Appendix B. <br /> 3.1 Boil es <br /> As encountered in the soil borings, . the near surface soils <br /> consisted, in general, of sandy, silty CLAYS. These materials <br /> �. existed to a depth of approximately three (3) feet below grade and <br /> were underlain, in general, by sandy SILTS with highly variable <br /> clay contents to a depth of approximately ten (10) feet below <br /> grade. The soil horizon below these SILTS was principally <br /> characterized by interlayered horizons of sandy SILTS and silty <br /> SANDS with occasional layers of relatively clean, poorly graded, <br /> medium and fine SANDS. The interlayered horizons graded <br /> increasingly towards the clean or silty, fine to medium SANDS with <br /> depth. A saturated horizon was encountered at a depth of 48k to 49 <br /> feet below grade in silty, fine to medium SANDS. Blow count data <br /> is not representative, due to the angle of the borings, and <br /> therefore was not recorded. However, drilling rates indicated <br /> medium dense and partially consolidated soil conditions. A <br /> .., reconstructed soil profile (with depths below grade corrected from <br /> s�rt` the "as-encountered" depths recorded on the boring logs) is <br /> included on Figures 3 and 4. More detailed soil descriptions are <br /> presented on the boring logs included as Appendix A. <br /> 3.2 Results of 9a or Screanin <br /> v Soil samples were screened for organic vapors utilizing an hNu <br /> portable photoionization detector (PTD) according to Aegis' SOP, <br /> Appendix C. The highest vapor readings were recorded on the boring <br /> lags included in Appendix A. Observed organic vapors ranged in <br /> concentration from 0 ppmv to 620 ppmv. The highest readings were <br /> observed at depths ranging from 25 to 35 vertical feet below grade <br /> '- in both borings. Soil organic vapor screening is summarized on <br /> Sections A-A' and B-B' , Figures 3 and 4. <br /> - <br /> 3,3 Soil a,lyses Results <br /> Soil samples were collected every five feet of auger using brass <br /> liners in a California-modified split-spoon sampler. Selected soil <br /> samples were submitted to Coast-to-Coast Analytical Services of <br /> _T _�r _—Napa, _California and were analyzed for total ur eable petroleum <br /> y p g <br /> hydrocarbons (TPPH) as gasoline, benzene; toluene, xylenes;ethyl --- — <br /> benzene, (BTX&E) ethylene dibromide (EDB) and 1,2-dichloroethane <br /> (EDC) by GC/MS, EPA Methods 6240/5030, and total lead by EPA method <br /> ! ' 7420. The certified laboratory reports and chain-of-custody are <br /> included as Appendix B. <br /> {.t. 90.2059.RPT - . . .. <br /> kap <br />