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w,wGEFS oEsGxeAsoa+s�iNrrs <br /> SECTION 2 <br /> 1 PHASE IV SITE INVESTIGATION <br /> 2.1 METHODOLOGY <br /> t2.1.1 Permits and Utility_Clearance <br />' Permits were obtained from the San Joaquin County EHD for the installation of monitor well <br /> MW-9 and the completion of bore hole BH-13 An encroachment permit was obtained from the <br />' City of Stockton for the completion of BH-13 on the public right-of-way An encroachment <br /> permit was obtained from Caltrans to install monitor well MW-9 on Caltrans property <br />' Underground Service Alert (USA) was notified prior to drilling activities Sampling locations <br /> were also cleared of subsurface obstructions by a private utility locating service prior to the <br /> commencement of dnlling activities <br /> 2.1.2 Soil Boring and Sampling MethodolpZy <br /> Soil boring BH-13 was located on the north side of Washington Street approximately 15 ft east <br /> of monitor well MW-2A Monitor well MW-9 was located on the south side of Washington <br /> Street on Caltrans property (Figure 2-1) Appendix A contains the boring logs <br /> The borings were advanced with a hand auger until native material was encountered and there <br /> was little danger of intercepting underground utilities The borings were then advanced with a <br /> truck mounted hollow stem auger ng Boring BH-13 and MW-9 were advanced to 65 8 ft below <br /> ground surface (bgs) and 55 ft bgs, respectively Soil samples were collected at 5-foot intervals <br /> starting at 10 ft bgs at BH-13 and MW-9 <br /> Soil samples were collected with a split spoon sampler lined with stainless steel sleeves All <br /> samples were screened in the field using a photoiomzation detector (PID) by placing the tip of <br />' the detector between two of the sleeves immediately after the sleeves were removed from the <br /> split spoon sampler PID readings are indicated on the boring logs (Appendix A) Seven soil <br /> samples collected from BH-13 and 2 soil samples collected from MW-9 were submitted to an <br /> analytical laboratory for analysis Soil samples submitted for analysis were chosen in <br /> consultation with Ms Mary Meays of the EHD <br />' L IErcraon WCWCHSA 1ST 3 octobu 19% <br />