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Mr Sam Savig Page 2 of 6 • of the USTs are shown on Figure 2 The USTs were removed under permit from PHS/EHD between June 11, 2001 and September 14, 2001, and ranged in size from 1,000 to 7,800 gallons Soil samples collected beneath the tanks contained low levels of gasoline and diesel/kerosene constituents Groundwater samples collected from the bottom of the tank excavation(s) also contained elevated levels of gasoline and diesel/kerosene constituents Analytical results of soil and groundwater samples collected from the excavations are included in Appendix A As a result of the initial sampling, PHS/EM requested additional investigation to evaluate the nature and extent of contamination associated with the former USTs 20 PROCEDURES 2.1 Permitting Prior to initiating fieldwork, well installation permits were obtained from PHS/EHD and an encroachment permit was obtained from the City of Tracy All fieldwork was performed in accordance with the Ground Zero's Site Safety Plan and Quality Assurance/Quality Control Plan included in Appendix B 2.2 Drilling and Soil Sampling On November 19, 2001, Spectrum Exploration (Spectrum), a State-licensed drilling company (C57- 512268), advanced three soil borings and subsequently installed groundwater monitoring wells MW1, MW2 and MW3 to further investigate the extent of subsurface contamination Boring/well locations are shown on Figure 3 All work was conducted under the supervision of field geologist Sean Garvey and project manager John Lane, a California Registered Geologist Mr Sam Savig of PHSIEHR conducted the grout inspection and observed field activities A drilling rig equipped with hollow stem augers was used to advance the borings Soil samples were collected at 5-foot intervals using an 18-inch long core sampler lined with new 2-inch diameter brass sleeves, which afforded soil identification and subjective evaluation for contamination A photo ionization detector (PID) was used to monitor the presence of volatile organic compounds (VOCs) in the soil Soil samples selected for analysis, based on field observations and PID readings, were sealed, labeled, and immediately placed in an iced cooler for transportation under chain of custody protocol to Argon Laboratory (Argon), a State certified testing laboratory (ELAP 2359) Analysis consisted of the following 1 Total petroleum hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), and total petroleum hydrocarbons as kerosene(TPHk)using EPA Method 8015M, 2 Benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA Method 8020, 3 Oxygenated gasoline additives methyl-tert-butyl-ether (MTBE), ethyl-tert-butyl-ether (ETBE), di- isopropyl ether (RIPE), tert-amyl-methyl-ether (TAME), and tert-butyl alcohol (TBA) using EPA Method 8260B, 4 Total lead using EPA method 7420 All drilling and sampling equipment was decontaminated by steam clearnng prior to use and using tri- sodium phosphate detergent between sample collection events to minimize the possibility of cross G 1Data\GROUNDZEITHORPE\Souza\Reports\WELLRPT doc