WORK PLANS - Laserfiche WebLink

Home Browse Search

will be removed and a section of dedicated IB-inch nyla0ow tubing will be lowered through the rods to the neared sampling depth. The annular space between the runs and tubing will be scaled using berannifte chips allowed to hydrate for 20 m ca ambirn it from admitting into the robing The tubing will be purged of ambient aira dedicaled syringe at a flow One no gremm than 200 milliliters pre minute brubmin). "ro obtain a laboramry reporting limit below the published shallow mil gas Califmia Hanson Health Screening Levels (CHHSL) for became under a residential scenario, vapor samples will be ambosed by a shimmery laboratory. Disavow a mobile laboratory will of be used, a purge volume test will not he performed and a default pares volume of tree will ho used. Following purging each boring, the vapor sample will be colleced using a t-Btu Summa equipped with a flow reslrictor set at 161 millimeters per minute (ml/min.) During sampling, 181-0iflmroefine (1,1-DFA) will be used as a Imk detection compound and sprayed around the probe ants and sample taking to evaluate potential teaks in the sampling stream. Each vapor sample will be analyzed by Au Toxica for the following analyses: • TpH6 following the United States Envimnmrntal Protection Agency (EPA) Test Method TO 15 • a® me,tern bro et nu ihylbam, torah xylmes OMDQ,MTBH and 1 j-0icM1lwcetham following FAA Test Method TO 15 • Naphthalene following EPA Test Method TO 15 • I,1-DFA (used as leak check compound) fallowing EPA Test Metlmd TO 15 Two sigh borings will be performed to obtain information regarding the physical properties of the soil. Al Wcse trances, a said sample will be collected from approximately 3 feet and amlyeed for the following: • Soil Bulk Density-American Smiety of Turfing and Materials (ASTM) D2937 • Ominlementy ASTMD854 • Soil Moisture Carried - ASTM D2216 • Omin Stirs - ASTMDd22 • Total Porosity- calculation from the and bulk density and the grain density Hach drect-pash boring will ho subsequently Wright u the ground surface with a neat region slurry. The dam collected during the SVS will be used in p rym mon of a Risk Assessment Report. These data will be used to perform a preliminary screening evaluation for eapor firousion using the agenterfirm Laclmspublished inrlhet pmlmmtofToxic SubsmrheceCmtml Califrain Environmental promotion Allergy's Interun Final Guidance for the Evaluation and Miigation ofSLGmrface Falser Inawrimr to Indoor Av, dated February ], 2005. If the assuming evaluation shows a potential vapor ineresion fro and transport modeling to evaluate the incremental risk from the transport of the mil gas into indoor air space will be performed using the U.S. EPA version of the Lamm and blunter (RE) vapor mutation model. Sains ical methods with be applied to the soil gas dam f evalwm: 1) if the data the mnmlly or h amormady dismbnlW, mho 2) use offer one-sided cmBderm limits (U(Ms) mthe true mace ofmch of the aril gas cemstiurnis detstwd using ProUC1., Version 3.00.02. no U.S. EPA Las Vegas