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Site Assessment Report <br /> 1022 Frontage Road <br /> C A M B R I A Ripon, California <br /> December 16, 2005 <br /> 4 0 SITE ASSESSMENT ACTIVITIES <br /> The objectives of the site assessment were to assess the lateral extent of impacted groundwater west of <br /> wells MW-8 and MW-9, and to assess the vertical extent of impacted groundwater in the vicinity of <br /> the USTs as requested by San Joaquin County Environmental Health In addition, a secondary <br /> objective was to install an air sparging well downgradient of the source area to conduct a SVE/AS <br /> pilot test All dnlling activities were conducted according to Cambria's Standard Operating <br /> Procedures presented in Appendix C To meet these objectives, Cambria completed the following <br /> tasks <br /> Personnel Present Cambria's Senior Staff Scientist Rowan Fennell supervised all drilling <br /> activities, which were overseen by Cambria's Project Geologist Brandon <br /> Wtlken, a California Professional Geologist <br /> Permits The San Joaquin Environmental Health Department issued subsurface <br /> drilling permits for the well installation and soil boring activities A copy <br /> of the permit is included in Appendix D <br /> Drilling Company Gregg Drilling (C57 #485165), of Martinez, California installed <br /> monitoring well MW-10 and air sparging well AS-1, and advanced soil <br /> boring B-18 <br /> Drilling Dates On August 15,2005,monitoring well MW-10 and air sparging well AS-1 <br /> were installed On August 16, 2005, soil boring B-18 was advanced <br /> Drilling Method Cambria marked out the drilling locations with white paint and notified <br /> underground service alert(USA)to have the utilities marked out Pnor to <br /> drilling,each Iocation was cleared of any interfering subsurface utilities to <br /> 5 ft bgs using a hand auger and post-hole digger A hollow stem auger <br /> drill rig was then used to dnll each boring to the desired depth Wells <br /> MW-10 and AS-1 were installed using 8-inch diameter hollow stem augers <br /> (HSA)and soil boring B-18 was advanced using 6-inch diameter HSA <br /> Soil Sampling Method Well AS-1 was sampled approximately every five feet to the total depth of <br /> the boring using an 18-inch California modified split spoon sampler <br /> Monitoring well MW-10 and soil Boring B-18 were continuously sampled <br /> and logged using an 18-inch California modified split spoon sampler and a <br /> 6 , <br />