Laserfiche WebLink
C A M B R I A Mr Ron Rowe <br />' August 17, 1998 <br /> CPT Investigation <br /> Cambria's scope of work for the CPT investigation included the installation of ten CPT bonngs on and <br />' offsite The site location is shown in Figure 1, and the CPT boring locations are shown in Figure 2 <br /> Analytical results for soil and ground water samples are presented in Tables 1 through 4 <br /> Personnel Present Geologist Mike Murphy of Cambna directed the field sampling, working <br /> under the supervision of Califonua Professional Engineer Owen Ratchye Ron <br /> Rowe of the SJCPHS was onsite for the majority of the field work <br /> Permits: SJCPHS Dnlhng Permits Nos 016251 and 016252 City of Ripon <br /> Encroachment permit No 1209 to install bonngs CPT-9 and CPT-10 in East <br /> Main Street (Both are included in Attachment A) <br /> Drilling Company. Gregg Dnlling, Inc of Martinez, California(C-57 License#485-165) <br /> Dnlling Dates• July 15 -20, 1998 <br /> Drilling Methods• Cone Penetration Test (hydraulic direct push) <br /> �54 Number of Bonngs: Ten (CPT-1 to CPT-10) <br /> Boring Depths: 43 8 to 53 6 ft bgs Boring logs are included as Attachment B <br /> I <br /> Boring Logs. Boring logs were generated by the CPT data acquisition equipment These <br /> logs were checked by the Operations Manager for the In Situ Division of <br /> Gregg Dnlling, and are included in the data package from Gregg Dnlling, <br /> which is attached as Appendix B Geologist Mike Murphy examined soils for <br /> agreement with the CPT data when soil samples were taken The CPT data <br /> generally agreed with the field examination, except that soils logged by the <br /> CPT as sands, generally appeared to the geologist to be silty sands, and the <br /> CPT soils logged as cemented sand generally appeared to the geologist to be <br /> Ia very tight sand with some clay or silt <br />} Sediment Lithology. The site subsurface consists of mixtures of silt, fine sands, and clays of <br /> generally low estimated permeability from the ground surface to <br /> approximately 26 ft bgs This was underlain in all ten bonngs by a more <br /> permeable layer consisting pn manly of silty sands, sands, and some gravels <br /> to an approximate depth range of 35 to 41 ft bgs Four of the ten borings had <br /> a second zone of relatively higher estimated permeability from approximately <br /> le! 38 to 44 ft bgs Most of the bonngs showed the more permeable zones to be <br /> 2 <br />