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Appendix H Cone Penetration Test Bonng Investigation Phase II ESA Multi-Modal Station Six-Block Project" January 6,2003 Page 2 of 3 •' 2.1 SITE PREPARATION On April 17, 2002, Condor submitted an application for encroachment on public right-of-way to the City of Stockton Public Works Department for the borings to be advanced within the roadway of the site On April 18, 2002, Condor submitted eight well permit application forms to the San Joaquin County Environmental Health Division (EHD) One well permit application form was submitted for each of the six blocks and two well permit application forms were submitted for the borings to be advanced within the roadways — one for CPT drilling and the other for Geoprobe drilling On May 10, 2002, Condor mailed letters to the owners of the properties located within the six-block area notifying them of the upcoming work intended to be conducted at the site All CPT and direct push boring location areas were marked with white paint, and Underground Services Alert (USA) was notified at least 72 hours in advance of the drilling fieldwork to locate and identify underground utilities in the vicinity of the work area However, because many of the proposed boring locations were on private property, some utilities contacted by USA did not mark the locations of their utilities past property boundaries and onto private properties EHD and the City of Stockton were notified of the fieldwork schedule at least 48 hours in advance Prior to commencement of fieldwork each day, a tailgate safety meeting was conducted and a site-specific Health and Safety Plan was discussed with, and presented to, all field personnel for their signatures 2.2 CONE PENETRATION TEST BORING PROCEDURES Gregg In Situ, Inc (Gregg) of Martinez, California, advanced five CPT bonngs (CPT1 through CPT5) at the site Each CPT boring (CPT1 through CPT5) was hydraulically advanced in the right-of-way from the ground surface to the termination point of the boring using an electric piezocone tip Measurements of the cone bearing pressure, sleeve friction, and dynamic pore water pressure were recorded at approximately two-inch intervals to provide a nearly continuous hydrogeologic log of the subsurface conditions The five CPT boring locations were selected to roughly bisect the site on the east-west and north-south axes in order to provide an indication of the hydrogeologic conditions across the site The five CPT logs were evaluated for the presence of potential permeable zones and distinct lithologic changes from the surface to the total depth of each boring The CPT cone and associated push rods were thoroughly cleaned before each CPT boring was advanced using laboratory-grade, non-phosphate detergent and de-ionized water and double-nnsed with de-ionized water Upon completion of the borings, the boreholes were grouted from the bottom of the boring to the ground surface with neat cement 2.3 CONE PENETRATION TEST BORINGS CPT borings CPT1, CPT2, CPT3, and CPT4 were advanced to an approximate depth of 120 feet bgs each CPT5 was advanced to an approximate depth of 174 feet bgs Field observations made during the installation of the CPT borings consisted of the real-time CPT boring logs, as well as PPDTs to evaluate the presence of groundwater at various depths In CPT-2, discoloration was noted within the first five feet of the boring that were hand-augered CPT borings are shown in Figures 5 -11, Appendix A Geologic cross-section lines are shown in Figure 5, Appendix A Generalized geologic cross-section A-A' (Figure 12,Appendix A) was constructed along an east/west orientation, looking to the north, and generalized geologic cross-section B-B' (Figure 13, Appendix A)was constructed along an northwest/southeast orientation, looking to the northeast