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1 Additional J4 Groundwater investigation Work Plan Raymond Investment Corporation May 19,2006 Page 4 C� 4.4 BORING AND WELL INSTALLATION FIELD PROCEDURES 4.1 SITE PREPARATION Condor will prepare street and/or sidewalk closure, easement, soil boring and monitoring well installation permit applications for submittal to the SJCEHD and City of Stockton. Condor will receive the permits prior to initiating any fieldwork. The proposed boring and monitoring well locations will be 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 Site, it is C the responsibility of the property owner to identify any Site utilities. Prior to initiating fieldwork at the Site, all field personnel will familiarize themselves with the Site-Specific Health and Safety Plan (HASP). 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 1 ' nearest hospital. A copy of the HASP is included in Appendix B. r Ill��aaa 4.2 DIRECT PUSH BORING FIELD PROCEDURES The direct push borings will be hydraulically.advanced using a 2-inch-diameter conical bit. The bit and associated push rods will be thoroughly cleaned before each boring is advanced using laboratory-grade, non-phosphate detergent and deionized water and double-rinsing with deionized water. Upon completion of the borings and sampling, the borings will be grouted with neat cement. Continuous core soil samples will be collected from the borings with a 1.75-inch outside diameter(O.D.), L Cj 5-foot-long core barrel fitted with a clean, single use, polyethylene liner. The soil sampling equipment will be cleaned prior to collecting the samples using laboratory-grade, non-phosphate detergent and _ deionized water and will be double rinsed with deionized water. During the sampling, the core barrel will i be' driven in .5-foot intervals. The sample liner will be extracted from the core barrel and used for . �d geological logging and field observations. The soil samples will be logged according to the Unified Soil Classification System (USCS). Portions of the soil samples will be placed in polyethylene bags and checked with a photoionization detector (PID) for the presence of volatile hydrocarbons. Geological logs will be prepared containing field observations including soil type, PID measurements, and the presence of staining or odor. Soil samples will be collected from the borings for Iaboratory analyses based on field observations and PID measurements. Soil samples will be collected from selected,borings and intervals for laboratory analyses. The soil cuttings will be placed in 55-gallon drums, sealed, labeled, and left on- Site to await disposal pending results of the laboratory analyses. Each soil sample collected for laboratory analyses will be cut from the liners. The liners will be sealed at the ends with Teflon® sheeting, capped, and labeled. The samples will be placed in a cooler chilled with Blue Ice® and_ delivered under chain-of-custody procedures to a California-certified laboratory for analyses. . Groundwater samples from the borings will be collected using a push-type groundwater sampler. 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 length of clean, 318-inch diameter polytygon tubing equipped with a check valve at the bottom. The tubing will be moved up and down by hand to draw i �' ILA CONDOR