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Project No. 013-10141 <br /> Page No.4 <br /> 5.1 Methodology <br /> • Notification of Underground Service Alert prior to commencement of fieldwork; <br /> • Preparation of a workplan, health and safety plan, and complete necessary permit applications <br /> with the San Joaquin County Environmental Health Department (SJCEHD) to obtain a Soil <br /> Boring Permit. <br /> • Collect soil samples from borings advanced via concrete coring, hand-auger, and GeoProbe <br /> direct-push drilling from the areas of concern with Photoionization Detector (PID) readings of <br /> each sample; <br /> • Submit the soil samples to a State-certified analytical laboratory for selected analyses of CoCs <br /> including: total petroleum hydrocarbons as gasoline (TPH-g) by EPA Method 8015B; total <br /> petroleum hydrocarbons as diesel (TPH-d)by EPA Method 8015B;total petroleum hydrocarbons <br /> - carbon range C8-C32 (TPH)by EPA Method 8015B; Volatile Organic Compounds (VOCs)by <br /> EPA Method 8260B; and Leaking Underground Fuel Tank(LUFT)metals by EPA Method 6010. <br /> • All soil samples were collected into clean 6-inch-long by 1.5-inch acetate sleeves. Once <br /> collected, the ends of each sample sleeve were covered with Teflon® film, capped with plastic <br /> end caps, labeled, placed into a plastic bag, sealed, and then placed into a thermal chest cooled <br /> with ice for delivery to a State-certified analytical laboratory. Soil borings were backfilled with <br /> neat cement under the oversight of the SJCEHD. <br /> • Equipment used for the advancement of soil borings and collection of soil samples was <br /> decontaminated before arriving on site,between each boring and/or sampling interval,and before <br /> leaving the site each day,or as necessary to reduce the chances of cross-contamination. <br /> • Field work was conducted by individuals meeting Occupational Safety and Health Administration <br /> requirements for hazardous waste work including 40-hour health and safety training and medical <br /> monitoring. The work was completed under the standards set forth by the industry and deemed <br /> acceptable by SJCEHD. <br /> 6.0 FIELD INVESTIGATION <br /> Inactive Clarifier and Drain <br /> • One soil boring (B-1) was advanced to a depth of five feet bgs adjacent to the location of the <br /> inactive equipment wash drain located within the southern portion of the site building (See <br /> Figures 2 and 3). Soil sample B-1@5' was collected from the base of the boring for laboratory <br /> analysis of TPH-g,TPH-d,VOCs,and LUFT Metals. <br /> • Two soil borings (B-2 and B-3)were advanced to a depth of ten feet bgs adjacent to each end of <br /> the inactive equipment wash clarifier located within the southern portion of the site building(See <br /> Figures 2 and 3). Soil samples B-2@10' and B-3@10'were collected from their respective <br /> borings for laboratory analysis of TPH-g,TPH-d,VOCs, and LUFT Metals Additionally,Krazan <br /> collected soil samples from B-2 and B-3 at depths of 15 and 20 feet bgs,which were put on hold <br /> pending the results of the shallower samples. <br /> KRAZAN&ASSOCIATES,INC. <br /> Conducting Assessments Nationwide <br /> 1310141 United Rentals LSI DRAFr.doc <br />