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• i Mr Kyle Christie Project 0805-147 01 • August 4, 1995 �f Page 2 SCOPE OF WORK The purpose of this investigation is to determine whether activities associated with the UST complex and fuel dispensers have impacted soil and groundwater beneath the site Field work will be conducted following Tri-Regional Guidelines and EMCON's Health and Safety Plan Field Procedures are presented in Attachment A PREFIELD ACTIVITIES EMCON will obtain well permits from the San Joaquin County Public Health Services (S7CPHS) EMCON will also notify Underground Service Alert of its intent to drill at least 48 hours before drilling to identify the location of underground utilities FIELD OPERATIONS Drilling and Soil Sampling • EMCON will observe a licensed well driller drill three 8-inch-diameter soil borings located near the tank complex One of the borings will be drilled at a 45 degree angle beneath the USTs with an estimated vertical depth of 25 feet bgs The other two borings will be drilled to an estimated depth of approximately 40 feet bgs (assumed first encountered groundwater) In addition, EMCON will observe the drilling of two 8-inch-diameter soil borings near the dispenser islands These borings will also be drilled at a 45 degree angle with an estimated vertical depth of 25 feet bgs The boring Iocations are shown on Figure 2 Undisturbed soil samples will be collected for classification and laboratory analyses at 5-foot intervals or at soil changes, from the ground surface to the total depth of the borings The soil samples will be classified using visual and manual methods according to the Unified Soil Classification System Drill cuttings will be stored onsite and placed on, and covered with, visqueen Four soil samples will be collected from the drill cuttings to be composited into one sample at the laboratory for evaluation of disposal options A minimum of two soil samples from each boring and the composite sample from the drill cuttings will be submitted to an approved laboratory certified by the state of California The samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHG), and • benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) using modified Environmental Protection Agency (EPA) Methods 8015 and 8020, respectively In addition, the samples collected from the drill cuttings will be analyzed for total lead, using EPA Method 7410, corrosivity, ignitability, and reactivity SAC\N1P70108051080514701AN-941dnns 1