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v + U Mr Martin Harris ry April 27,2004 • Page 2 of 7 Duncan of EHD conducted the grout inspection and observed field activities 2.0 INVESTIGATIVE PROCEDURES 2.1 Permitting Drilling permits were obtained from EHD prior to initiating fieldwork All fieldwork was performed in accordance with the Ground Zero's Site Safety Plan and Quality Assurance/Quality Control Plan 2.2 Cone Penetrometer Testing Fisch advanced one CPT boring (CPT1) on January 12, 2004 utilizing a 25-ton, combination direct push/hollow stern auger drilling rig Boring CPT1 was drilled within a few feet of well MW1 (Figure 2) to determine shallow soil stratigraphy beneath the site Due to rod refusal, drilling was terminated at a depth of approximately 35 feet below ground surface (bgs) Electric CPT data transmitted from the cone tip provided information on soil behavior by measuring penetration resistance, friction ratio, and pore pressure Correlation of soil behavior to soil type was made electronically, based on a soil classification chart interpreted by Robertson & Campanella (1983) A copy of the CPT log is included in Attachment A '* 2.3 Drilling and Soil Sampling Fisch completed soil boring SB4 using direct push drilling methods, installed groundwater monitoring wells MW5 and MW6 using hollow stem auger drilling, and installed well MW7 using direct push procedures during the period January 12, 2004 through January 14, 2004 Soil samples were collected continuously from borings MW5, MW6, and MW7 using a 4-foot long core sampler lined with inert plastic sleeves, which afforded soil identification and subjective evaluation of contamination A photo ionization detector (PID) was used to monitor the soil for volatile organic compounds (VOCs) Soil samples selected for analysis, based on field observations and PID readings, were sealed, labeled, and immediately placed in an iced cooler for transportation to Argon under chain of custody protocol Selected samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) using modified EPA method 8015B, benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA method 8021B, and oxygenated gasoline additives, including 1,2-dichloroethane (1,2-DCA)and ethylene dibromide (EDB), using EPA method 8260B All drilling and sampling equipment was decontaminated prior to and between each use to minimize the possibility of cross contamination 2.4 Discrete Groundwater Sampling On January 12, 2004, Fisch advanced one direct push boring (SB4) adjacent to boring CPT1 Groundze/sou2m/reports/WELLRPT2b doc