WORK PLANS FILE 2 - Laserfiche WebLink

Home Browse Search

Task 1 - Field Activities Stratus will obtain drilling permits from PHS-EHD prior to commencing field activities and contact Underground Service Alert to identify and mark underground utilities in the area of proposed boring. Procedures that will be implemented during field activities are briefly summarized below and are detailed in Appendix A. The proposed soil boring will be located in the vicinity of MW-13 and MW-14, and will be drilled to a total depth of 100 feet bgs (figure 2). It is anticipated that the boring can be completed by using a drill rig equipped with hollow-stem augers. If field observations suggest that impact extends beyond that depth, Stratus will continue drilling and sample collection until no further hydrocarbon evidence is present or until the limits of the drilling equipment are reached. Soil samples will not be collected from the upper 30 feet since soil within this region consists of clean backfill which was placed after over excavation activities. Samples will be collected between the depth of 30 to 90 feet bgs at 40, 50, 55, 65, 75, and 85 feet bgs. These collection depths were selected based on the results of samples collected and analyzed from MW-13 and MW-14. Beginning at 90 feet bgs, soil samples will be collected every 5 feet. Soil samples will be collected by using a modified California split- spoon sampler and classified using the Unified Soil Classification System. The soil samples will be field screened for the presence of petroleum hydrocarbons using a flame ionization detector. Samples submitted for analyses will be based on field screening and physical observations. Soil generated during the drilling will be stockpiled on and covered with plastic sheeting. A soil sample will be collected from the stockpile for laboratory analysis and disposal purposes. The soil boring will be backfilled to the surface with bentonite/cement grout. Task 2 - Laboratory Analysis We estimate that a total of 6 soil samples collected from the soil boring will be submitted to a state-certified laboratory for analyses. The stockpile sample will also be submitted for analysis. The samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHG); benzene, toluene, ethylbenzene, and xylene isomers (BTEX) using U.S. Environmental Protection Agency (USEPA) Method 8015/8020 Modified; and oxygenates using USEPA Method 8260. Samples will be submitted for standard turn around. Task 3 - Data Evaluation and Report Preparation Stratus will prepare an investigation report following completion of field activities and receipt of analytical results. The report will summarize the field work performed, present Teichert-work plan 2