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i Quik Stop Station No.076 November 2,2001 I Stockton California Work Plan for Soil and Groundwater Investigation PROPOSED SOIL INVESTIGATION Ij r The purpose of the site assessment is to: a) evaluate the lateral and vertical extent of petroleum hydrocarbons reported in soil samples collected from beneath the southern end of former UST T-1; and b) evaluate whether groundwater has been impacted by petroleum hydrocarbons. The proposed work shall include field planning and scheduling, advancement of three soil borings, soil sampling, collection of one hydropunch groundwater sample, and reporting. All fieldwork shall be conducted in accordance with Horizon Field Methods and Procedures contained in Appendix C. The tasks are described in detail below. Task 1 Select and schedule a drilling contractor; obtain the necessary permits from the SJCEHD; prepare a site-specific Health and Safety Plan; notify Underground Service Alert (USA); Task 2 Advance three soil borings (SB-1 through SB-3) at the locations shown on Fi ure 2. Soil borings shall be advanced b a C-57 licensed drilling contractor g g Y g utilizing minimum-diameter hollow-stem auger drilling equipment. Lithologic descriptions, drilling progress, sampling information shall be recorded on soil boring g g logs. Soils shall be described using the Unified Soil Classification System (USCS). Drill cuttings shall be stockpiled on and covered with plastic sheet. Advance the three soil borings to groundwater which is expected to be approximately 55 feet bsg. Collect soil samples at 5-foot intervals and field screen soil for the presence of volatile hydrocarbons with a photo-ionization detector (PID) or equivalent device. Collect a groundwater sample utilizing a hydropunch tool. 7076wp I 1-0 Ldoc Project No.7076.12 4 HORIZON ENVIRONMENTAL INC.