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OCT 21 2013 <br /> ENVIRONMRTM ENTAL <br /> HEALTH DEPANT <br /> Sample sleeves and plastic bags used for VOC screening will be used on a one-time-only basis. Used <br /> disposable sampling/screening supplies will be stored in plastic bags for subsequent disposal. <br /> Non-disposable boring equipment that comes in contact with soil that appears potentially impacted by <br /> hazardous materials or petroleum products (based on observations and field monitoring/screening results) <br /> will be decontaminated prior to use by a wash-and-double-rinse process using a non-phosphate detergent <br /> solution (e.g., Alconox), deionized or distilled water, and tapwater. Excess soil sample and <br /> decontamination water generated will be containerized and disposed of appropriately. <br /> Boreholes will be backfilled with bentonite slurry and asphalt patch will be used to repair paved areas, <br /> as needed. Boring and sampling activities will not materially impact the physical condition ofthe Site. <br /> Quality Assurance/Quality Control Procedures <br /> Quality assurance/quality control (QA/QC) procedures will be performed during the soil sampling <br /> activities. These procedures will include decontamination of sampling equipment prior to and between <br /> each borehole location and providing COC documentation for each sample submitted to the laboratory. <br /> The soil sampling equipment will be cleansed by washing the equipment with an Alconox®solution <br /> followed by a double rinse with deionized water. <br /> Laboratory Analyses <br /> Soil Samples <br /> Soil samples will be selected for analysis based on field observations and soil screening results (e.g., <br /> soil discoloration, chemical odor, PID readings, etc.), sample locations/depths, and the experience and <br /> judgment of supervisory field personnel and technical support personnel. Selected soil samples will be <br /> analyzed under standard ten-day turnaround time(TAT)by ATL for the following analyses: <br /> • Four soil samples including any showing field indicators of petroleum hydrocarbon impacts (e.g. <br /> staining, odors, etc.) will be analyzed for total petroleum hydrocarbons as gasoline (TPHg), diesel <br /> (TPHd), and motor oil (TPHmo) following United States Environmental Protection Agency <br /> (EPA)Test Method 8015B(M). <br /> • Two soil samples will be analyzed for VOCs and fuel oxygenate compounds (FOCs) following <br /> EPA Test Method 8260B, semi-volatile organic compounds (SVOCs) following EPA Test <br /> Method 8270C, and polychlorinated biphenyls(PCBs)following EPA Test Method 8082. <br /> • Two soil samples will be analyzed for Title 22 metals following EPA Test Methods 6010B and <br /> 7471 A(mercury). <br /> • Soil samples with elevated total metal concentrations may be further analyzed for soluble metals <br /> using the Waste Extraction Test. <br /> Laboratory QA/QC Procedures <br /> QA/QC procedures will be performed by ATL for each method of analysis with specificity for each <br /> analyte listed in the test method's QA/QC. QA/QC measures as applicable will include the following: <br /> • One method blank for every ten samples, batch of samples or type of matrix, whichever is more <br /> frequent. <br /> Linden UST Site Investigation,TO No.4 Caltrans Contract 06A1895,EANo. 10-OY3600 <br /> Geocon Project No.S9800-01-04 -3 - October 8,2013 <br />