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Abdelwahed Facility, UltraSite No. 13792 kJ May 5, 2012 - Stockton California Work Plan Well for DPE Well Installation and Soil Gas Investigation detected, evaluate the cause of the leak and correct before continuation of sampling. Collect soil gas samples utilizing new 50 milliliter or 100 milliliter sampling syringes (depending on analytical reporting -limit requirements) over at least 15 or 30 seconds, respectively, to attain a flow rate of 200 milliliters per minute (ml/min) or less; collect one equipment blank sample to verify the effectiveness of decontamination procedures or possible interference from ambient air; collect one duplicate sample at SG -2 location to be analyzed in the mobile lab to check for procedural and analytical reproducibility and precision; and:collect one duplicate 0.25 -liter Summa canister sample at SG -3 location to be analyzed by an outside lab to check for procedural and analytical reproducibility and precision. Analyze soil gas samples in the on-site mobile lab within 10 minutes of collection for: total petroleum hydrocarbons as diesel (TPHd) by modified Environmental Protection Agency (EPA) Method 8015; total petroleum hydrocarbons as gasoline (TPHg); the volatile aromatics benzene, toluene, ethylbenzene and xylenes (BTEX); methyl -t -butyl ether (MTBE); the two lead scavengers 1,2-dichloroethane (DCA) and 1,2-dibromoethane (EDB) and for the leak compound DFA by EPA Method 8260B; and utilize analyte reporting limits at or below the commercial values for the selected analytes listed in Table E-1, Environmental Screening Levels (ESLs) Indoor Air and Soil Gas (Vapor Intrusion Concerns) published by the San Francisco Bay RWQCB (Region 2 ESLs) Interim Final (revised May 2008) and in Table 2, California Human Health Screening Levels (CHHSLs) for Indoor Air and Soil Gas (Shallow Soil Gas Human Health Screening Levels, Vapor Intrusion) published by Cal /EPA January 2005. Task 3 Abandon all probe bore holes by backfilling with bentonite/cement grout to within approximately 6 inches from surface; and finish the surface with a flush concrete plug. Task 4 Transport and submit Summa canister sample to outside lab for analysis of TPHd by EPA Method TO -17, and TP14g, BTEX, MTBE, DCA, EDB and DFA by EPA Method TO -15. Task 5 Prepare a report documenting the performance of the soil gas investigation including: a site map showing the soil gas sampling points; a tabulated summary of analytical results; comparison of soil gas analytical results to appropriate screening levels; and evaluation of the vapor intrusion/inhalation exposure pathway and the associated health risk to workers in the site building. 1792 ME Well WP Project No. 1792.26 7 HORIZON ENVIRONMENTAL INC.