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U <br /> Project No. 034-97252 <br /> Page No. 2 <br /> j <br /> Accordingly, Union Bank of California required additional investigation consisting of one exploratory J i <br /> boring and the collection of soil samples for analysis. <br /> k <br /> Krazan and Associates advanced two soil borings within the area of the former UST at the site on <br /> January 14, 1998. Analytical testing on a soil sample obtained from a depth of 20 feet in one of these <br /> i <br /> borings revealed detectible concentrations of total petroleum hydrocarbons as gasoline as well as benzene, <br /> ethyl benzene, and xylenes. Although the detected concentrations of these constituents are relatively low, <br /> the horizontal and vertical extent of impacted soils is unknown. <br /> SCOPE OF WORK <br /> .::�`. - -� �. � ,._�,__,.�-�-_—_..> ,. � <br /> In order to characterize the horizontal and vertical extent of sail contamination at the sitea, ,-it is <br /> proposed to advance and collect soil samples from four direct push Geoprobe soil borings in the area of <br /> the former UST. The locations of the proposed soil direct push borings are shown on the attached Site <br /> Map. The borings would be advanced to a maximum depth of 30 feet below surface grade (bsg). Soil <br /> samples would be collected at five foot intervals and would be field screened for visual and olfactory <br /> evidences of petroleum hydrocarbons as well as field screened with a photoionization detector (PID). <br /> Based upon field screening results, up to three soil samples per boring would be submitted to a State- <br /> certified laboratory for chemical analysis. One of the direct push borings may be extended to the } <br /> groundwater table (expected to be present at an approximate depth of 40 feet) for collection of a <br /> groundwater sample if the encountered conditions so warrant. <br /> Each submitted sample would be tested total petroleum hydrocarbons as gasoline (TPH-g) as well <br /> as benzene, toluene, ethyl benzene, and xylenes (BTEX) by EPA Methods 8015M/8020M. <br /> During drilling activities, soil samples would be screened periodically with a photo-ionization } <br /> -detector•(PID)7-Soil.samples rwould-be examined�by,-the-fie.ld-geologist_for:definition.,of,site.lithology. <br /> Field activities would be conducted in Level D personal protective equipment. Field work would be <br /> conducted by personnel who meet United States Occupational Safety and Health Administration <br /> requirements for hazardous waste work including 40 hour health and safety training and medical <br /> monitoring. Drilling and sampling equipment would be decontaminated prior to use in order to reduce the <br /> chances of cross-contamination. In accord with County requirements, the borings would be backfilled with <br /> neat cement grout. <br /> Following completion of the site investigation activities, all data would be analyzed, and a report <br /> detailing the purpose, scope, and methodologies associated with our services would be prepared. The <br /> { <br /> KRAZAN&ASSOCIATES, INC. <br /> Offices Serving the Western United States <br /> 3497252.W PL <br />