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L Lot B Underground Storage Tank—Monitorin*]1 and Additional Delineation Work Plan 216 N.California Street,Stockton,California February 2,2010 Page 6 L 5.0 BORING INSTALLATION FIELD PROCEDURES L 5.1 SITE PREPARATION Condor will prepare the soil boring installation permit applications for submittal to the SJCEHD. Condor will obtain the required permits prior to initiating any fieldwork. The proposed boring locations will be bw marked with white paint and Underground Service Alert (USA) will be notified at least 48 hours in advance of the fieldwork to locate and identify underground utilities in and near the work area. However, because companies contacted by USA may not identify utilities past private property lines and into the im Site, a private utility line locator will survey Site utilities (if present). Prior to initiating fieldwork at the Site, all field personnel will familiarize themselves with the Site-Specific Health and Safety Plan(HASP, Appendix B). In addition,a tailgate safety meeting will be held prior to commencement of fieldwork.The HASP pertains to field activities and includes information on potential hazards expected to be encountered at the Site, personal protective equipment, and directions to and telephone numbers for the nearest hospital. L 5.2 CONE PENERATION TEST FIELD PROCEDURES The CPT borings will be hydraulically advanced using a 2-inch-diameter conical bit. The bit and 62 associated push rods will be thoroughly cleaned before each boring is advanced using a laboratory-grade, non-phosphate detergent and deionized water and double-rinsing with deionized water. ` The soil behavior (tip pressure and sleeve friction) will be logged as the probe is advanced. The ratio of soil behaviors will be used to classify the penetrated soil by soil behavior type (SBT), which is similar to the Unified Soil Classification System (USCS). A pore pressure test will be conducted to determine the L approximate depth to water from the surface. Data logs will be prepared containing observations including soil behavior type, and the location of soil and groundwater samples. Soil and groundwater samples will be collected from the borings for laboratory analyses at 30,40, 50, and 60 feet bgs. Discrete depth soil samples will be collected from the borings with a 1-inch outside diameter (O.D.), 12-foot-long core barrel fitted with a clean, single use, stainless steel liner. The soil sampling equipment 6. will be cleaned prior to collecting the samples as described above. Soil samples will be collected from selected borings and intervals for laboratory analyses. The liners will be sealed at the ends with Teflon® sheeting, capped, and labeled. The samples will then be placed in a cooler with Blue Ice®and delivered ` under chain-of-custody procedures to a California-certified laboratory for analyses. The groundwater samples from the borings will be collected using a push-type groundwater sampler. The groundwater sample will be collected from a depth of 33 to 37 feet bgs or at another depth determined by the geologist on Site. The sampler has a sealed, retrievable stainless steel screen. The sampler will be pushed in a closed position to the desired sampling interval. The sampler push rod will then be retracted ` exposing the inlet screen. Groundwater will flow hydrostatically from the formation into the inlet screen. A groundwater sample will be retrieved from within the screen with a stainless steel bailer or a length of clean, 3/8-inch diameter polyethylene tubing equipped with a check valve at the bottom. The tubing will be moved up and down by hand to draw groundwater up inside the tubing. The groundwater samples will be discharged directly from the tubing into laboratory-supplied sample containers. The sample containers will be sealed, labeled, placed in a cooler with Blue Ice®, and delivered under chain-of-custody procedures to a California-certified laboratory for analyses. Upon completion of the borings and L sampling,the borings will be grouted with neat cement to the surface. L Lis CONDOR