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Soil samples will be collected in clean new acetate sleeves. Labels that indicate the sample number, date/time of collection, etc., will be affixed to the sample sleeves and the samples will be placed into a chilled ice chest for storage and subsequent transportation to the analytical laboratory. Samples will be handled and transported in accordance with industry-standard chain-of-custody(COC)protocol. The sample containers will be labeled, placed in an ice chest containing ice and delivered to the analytical laboratory following COC protocol. We will backfill each direct-push boring from its total depth to the ground surface with a Portland cement/bentonite slurry. The borings will be logged using Unified Soil Classification System (USCS) descriptions. Soil samples will be observed for indications of hazardous materials or petroleum products (e.g., soil discoloration or "chemical" odor). Samples will be 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." A hand-held Global Positioning System (GPS) receiver will be used to determine the latitude/longitude coordinates of boring locations. Pertinent information will be documented in field logs. Field Quality Assurance/Quality Control We will perform standard quality assurance/quality control (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., Alconox), deionized or distilled water, and tap water. Excess soil core and decontamination water generated will be containerized and appropriately disposed of. Traffic Control Caltrans will provide an attenuator truck during the field sampling activities. We will provide traffic control measures using "SHOULDER WORK AHEAD" advance warning signs and cones. The fieldwork will be performed under the supervision of our field supervisor and/or project manager. Laboratory Analyses Soil samples collected during PSI activities will be submitted to and analyzed by ATL. ATL is a California Department of Health Services-certified laboratory. Samples will be analyzed on a standard ten-day turn-around-time. Based on information in the TO, the following summarizes the sample analyses: SR-99/Monitoring Stations,Task Order No.89 Caltrans Contract 06A1141,EA 10-OK3201 Project No.S9200-06-89 -3- November 17,2009