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r <br /> a ' <br /> I <br /> J ` <br /> t <br /> ' 27 February 2004 <br /> AGE-NC Project No 95-0144 <br /> ' Page 2 of 7 <br /> On 07 August 2003, depth to water was measured in the fifteen ground water monitoring wells at <br /> ' the site, and ground water samples were collected from each well in accordance with the revised <br /> monitoring schedule established at a 25 September 2002 meeting with the EHD <br /> 1 <br /> 2 1 MONITORING WELL INSTALLATION <br /> S <br /> ' One ground water monitoring well(MW-25)was installed on 21 July, developed on 29 July and thie ' <br /> casing elevation and GPS data was surveyed in late October 2003 <br /> 1 � <br /> I � <br /> 21 1 Drilling and Sampling <br /> The pilot boring for monitoring well MW-25 was advanced using a CME-75 drill rig,equipped with <br /> 8 25-inch diameter hollow-stem augers The drill ng and three-man crew were supplied by Cascade <br /> Drilling <br /> I <br /> Soil samples were collected ahead of the drill bit using a California modified split-spoon sampler <br /> ' loaded with three pre-cleaned 2-inch by 6-Inch brass sleeves Soil samples collected from boring <br /> MW-25 at ten-foot intervals, beginning at 10 feet below surface grade (bsg) using a 140-pound <br /> ' hammer to advance the sampler The number of blows required to advance the sampler over each <br /> 6-Inch Increment of the 18-Inch sampling Interval were recorded on the boring log Sampling <br /> equipment was washed in an Alconox solution and double rinsed with water prior to each sampling <br /> ' run to minimize cross-contamination Auger returns generated by drilling were contamenzed in <br /> properly labeled Department of Transportation(DOT)-approved 55-gallon drums and stored on-site <br /> ' For each sample,both ends of the leading or other selected sleeve were covered with Teflon sheets, <br /> capped and sealed with tape The samples were properly labeled,stored on Ice and transported under <br /> chain-of-custody to Castle Analytical Laboratory(CAL),a State of California Department of Health <br /> ' Services (DHS)-certified analytical laboratory <br /> I <br /> ' 212 Logging <br /> Soil was extruded from the remaining brass sleeves of each soil sample collected and was screened <br /> ' for the presence of organic vapor using an organic vapor meter (OVM) equipped with a photo- <br /> ionization detector (PID Thermo Environmental 580B, 10 0 eV, calibrated, to isobutylene) The <br /> organic vapor readings were recorded on a boring log The soil was then visually described on the <br /> ' boring log in accordance with the Unified Soil Classification System (see Appendix A) <br /> Advanced GeoEnvironmental,Inc <br /> r <br /> L L c I <br />