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a. Ulm- INEM01 tir L_ S: 8 2.0 SCOPE OF WORK The following work steps were performed between February 26 and March 6, 1991: Prepared a Site Specific Health and Safety Plan. Obtained ali necessary permits. Drilled and togged three on-site .oil borings at locations specified by Ultramar,Inc. Collected soil samples from the borings for State-certified laboratory analyses. 2.1 Site Specific Health and Safety Plan Prior to on-site activities, Groundwater Technology prepared a Site Specific Health and Safety Plan (SSHSP) In accordance with the Occupation Safety and Health Administration (OSHA) standard "Hazardous Waste Operations and Emergency Response"(29 GFR 1910.120). The plan addressed the potential chemical and physical exposures to Groundwater Technology personnel could encounterwhile working at the site. Additionally, all personnel assigned to field operations were required to have completed the 40 hour health and safety training requirements under OSHA standards and to have reviewed and signed the SSHSP prepared for this investigation. 2.2 oil Borings On March 7, 1991, three soil borings were drilled to assess subsurface conditions (Figure 2). The borings were drilled with a truck-mounted rotary drill rig using 6.25-inch outside diameter(O.D.) steam- cleaned hollow-stem augers. The drilling was supeMsed by a field geologist woricing under the direction of a State of-California Registered Geologist. A continuous log of materials encountered while doling was completed by the field geologist (Appendix A). All soil generated during drilling was placed on plastic sheets pending the results of laaoratory analyses. In accordance with Ultramar protocol, two of the soil borings, SE-1 and SB-3,were trilled to a depth of 36 feet below grade. SB-2 was drilled to a depth of 51 feet. The borings were backfilied with cement grout from total depth to surface. 2.3 Soil Sampling Soil sampling was conducted jr eacfr boring at intervals of approximately 5 feet, beginning at 5-feet below grade and continuing to completion depth. Samples were collected using a 2.5-inch O.D. modified California split-spoon sampler lined with three, 2 inch-diameter by 6-inch-long brass sample tubes. Each sample was field screened for volatile hydrocarbons using a portable photo-ionization detector (PIU). The samples were sealed, capped, labeled, preserved on ice, and under chain-of- custody manifest, were submitted to Applied Analytical Environmental Laboratories in Sacramento, analyzed ---- - - - - - - - - ~' California far analysis. Three soil samples-from each boringwere -henzene,_toluene,_ I_ GROUND ATER - F+M1 TECHNOLOGY,INC, is PRIOR in 11 le LEON 2