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Iy xf- � - 1 - •• .. r .. S ' Monitoring Well Installation and Quarterly Monitoring Report • SIERRA LUMBER MANUFACTURERS (Case#2) ' 375 West Hazelton Avenue, Stockton, California ' 1.0. INTRODUCTION At the request of Mr Bob Long, Advanced GeoEnvironmental, Inc (AGE) has prepared this ' monitoring well installation and quarterly report for the property located at 375 West Hazelton Avenue, Stockton, California The site and surrounding area are illustrated on Figure 1 Structures, ' soil borings,and monitoring well locations are illustrated on Figure 2 Site background information is summarized in Appendix A ' 2.0. PROCEDURES Field work was performed in accordance with guidelines issued by the Central Valley Regional ' Water Quality Control Board(CVRWQCB)for the investigation of underground storage tank(UST) sites and by the San Joaquin County Environmental Health Department(EHD) for the sampling of ' ground water monitoring wells The scope of work was outlined in the AGE-prepared Preliminary Site Investigation Work Plan, dated 27 December 2004 and approved by the EHD in a letter dated 23 February 2005 21 MONITORING WELL INSTALLATION, DEVELOPMENT, AND SURVEY On 29 March 2005, three ground water monitoring wells (MW-9 through MW-11) were installed at the site The monitoring wells were developed on 06 April 2005, sampled on 11 April 2005, and surveyed on 03 May 2005 2 1 1 Drilling and Sampling On 29 March 2005, a CME-75HT truck-mounted drill rig was utilized to advance pilot soil borings MW-9 through MW-11 to 40 feet below surface grade(bsg)using 8 25-inch diameter hollow-stem augers The drill rig and three-man crew were supplied by Cascade Dnlling,•Inc of Rancho Cordova, California Auger returns generated by drilling were containerized in properly labeled, Department of Transportation (DOT)-approved 55-gallon drums and stored on-site pending proper disposal Soil samples were collected ahead of the drill bit using a California modified, 18-inch split-spoon sampler loaded with three pre-cleaned, 2-inch by 6-inch brass sleeves The samples were collected from the pilot borings at 5-foot intervals, beginning at 5 feet bsg, using a 140-pound hammer to I advance the sampler The number of blows required to advance the sampler over each 6-inch increment of the 18-inch sampling interval was recorded on the boring logs After sample recovery, iboth ends of the middle sleeve were covered with Teflon sheets, capped, and sealed with tape The .advanced GeoEnvironmentai,Inc