SITE INFORMATION AND CORRESPONDENCE

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E)1/28/11398 09:21 9165642222 KRAZAN SACRAMENTO PAGE 03 Project No. 034-97252 Page No. 2 Accordingly, Union Bank of California required additional investigation consisting of one exploratory boring and the collection of soil samples for analysis. Krazan and Associates advanced two soil borings within the area of the former UST at the site on January 14, 1998. Analytical testing on a soil sample obtained from a depth of 20 feet in one of these borings revealed detectible concentrations of total petroleum hydrocarbons as gasoline as well as benzene, ethyl benzene, and xylenes. Although the detected concentrations of these constituents are relatively low, the horizontal and vertical extent of impacted soils is unknown- SCOPE-OF nknown_S OPEOF WORK In order to characterize the horizontal and vertical extent of soil contamination at the site, it is proposed to advance and collect soil samples from four direct push Geoprobe soil borings in the area of the former UST. The locations of the proposed soil direct push borings are shown on the attached Site Map. The borings would be advanced to a maximum depth of 30 feet below surface grade(bsg). Soil samples would be collected at five foot intervals and would be field screened for visual and olfactory evidences of petroleum hydrocarbons as well as field screened with a photoionization. detector (PID)_ Based upon field screening results, up to three soil samples per boring would be submitted to a State- certified laboratory for chemical analysis. One of the direct push borings may be extended to the groundwater table (expected to be present at an approximate depth of 40 feet) for collection of a groundwater sample if the encountered conditions so warrant. Each submitted sample would be tested total petroleum hydrocarbons as gasoline(TPH-g)as well as benzene, toluene, ethyl benzene, and xylenes(BTEX)by EPA Methods 8015M/8020M. During drilling activities, soil samples would be screened periodically with a photo-ionization detector (PID). Soil samples would be examined by the field geologist for definition of site Mology_ Field activities would be conducted in Level D personal protective equipment. Field work would be conducted by personnel who meet United States Occupational Safety and Health Administration requirements for hazardous waste work including 40 hour health and safety training and medical monitoring. Drilling and sampling equipment would be decontaminated prior to use in order to reduce the chances of cross-contamination. In accord with County requirements, the borings would be backfilled with neat cement grout- Following completion of the site investigation activities, all data would be analyzed, and a report detailing the purpose, scope, and methodologies associated with our services would be prepared. The KRAZAN&ASSOCIATES,INC. Qfflces Serving the Western United Stabs 3a97Z52.w1?L