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observed for indications of hazardous materials (asbestos) or petroleum products (e.g., soil discoloration or"chemical"odor). Samples will be field screened with a photoionization detector(PID) for preliminary indications of volatile organic compounds (VOCs). Soil collected for screening purposes will be placed in a new re-sealable plastic bag and the PID will be used to screen the sample for VOCs within the bag "headspace." Pertinent information will be documented in field logs. Each boring will be backfilled with a cement/bentonite slurry and capped with asphalt cold patch or concrete mix, as appropriate. Sample Identification We will mark each sample with the TO number and a unique sample identification number. Sample identification will include the date and time the sample was collected and the approximate sample location. We will survey the boring locations using a global positioning system (GPS). The GPS has a manufacturer's rated horizontal position with an error not to exceed 3.3 feet. We will use the GPS to record the position of each sampling location using the latitude-longitude coordinate system. Traffic Control Where necessary, Geocon will provide appropriate traffic control barricades, cones and signage in accordance with the requirements outlined in Caltrans Contract 06A1141 and TO attachments. Field Quality Assurance/Quality Control Procedures We will perform standard QA/QC procedures during the field exploration activities. These procedures include decontamination of sampling equipment before each sample is collected, and providing COC documentation for each sample submitted for analyses. We will clean the sampling equipment prior to the collection of each sample by washing the equipment with an Alconox'�'solution followed by a double rinse with deionized water. Sample sleeves and plastic bags used for VOC-screening will be used on a one-time-only basis. Used disposable sampling/screening supplies will be stored in plastic bags for subsequent disposal. Non- disposable boring equipment that comes in contact with soil that appears potentially impacted by hazardous materials or petroleum products (based on observations and field monitoring/screening results) will be decontaminated prior to next use by an industry-standard wash-and-double-rinse process using a non-phosphate detergent solution(e.g., Alconoxo),deionized or distilled water, and tap water. Excess soil core and decontamination water generated will be containerized and appropriately disposed of. Stockton State Route 99 Improvement Project,Task Order No.82 Caltrans Contract 06A1141,EA 10-3AI00I Project No.S9200-06-82 -4- December 30,2009