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I � w ' Monitoring Well Installation and Quarterly Report-Fourth Quarter 2003 R M.B. GARAGE (ERARDI VENTURES) ' 715 North Hunter Street, Stockton, California ' 1.0. INTRODUCTION At the request ofMr Vince Erardi of Erardi Ventures,Advanced GeoEnvironmental,Inc (AGE)has ' prepared this monitoring well installation and quarterly report for the property located at 715 North Hunter Street, Stockton, California The scope of work included the advancement of five soil ' bonngs, four of which were completed as monitoring wells, development of the wells, the performance of a quarterly ground water monitoring event and the preparation of this report The site and the surrounding area are illustrated on Figure 1 On-site structures and monitoring well locations ' are illustrated on Figure 2 Additional site background information is provided in Appendix A ' 2.0. PROCEDURES On 04, 05 and 25 September 2004, soil borings MW1 through MW4 and B5 were advanced at the ' site Field work was performed as outlined in the AGE-prepared Monitoring Well Installation Work Plan - May 2002, dated 22 May 2002 and approved by the San Joaquin County Environmental Health Department(EHD)by letter dated 22 July 2002,the work was performed in accordance with '. guidelines established by the Central Valley Regional Water Quality Control Board(CVRWQCB) for the investigation of underground storage tank (UST) sites 1 21 DRILLING AND SAMPLING ' Pilot borings MW 1 through MW3 and B5 were advanced using a CME-75HT drill rig, equipped with 8 25-inch diameter hollow-stem augers, the drill rig and three-man crew were supplied by Mitchell Drilling Environmental Pilot boring MW4 was advanced using a limited-access drill rig ' (LAR) equipped with 8 25-inch diameter hollow stem-augers, the LAR and three-man crew were supplied by Cascade Drilling Auger returns generated by drilling were containerized in properly ' labeled Department of Transportation (DOT)-approved model 17H 55-gallon drums and stored on-site ' Borings MW 1 through MW4 were drilled to a depth of 40 feet below surface grade (bsg) for completion as ground water monitonng wells Boring B5 was drilled deeper in order to define the vertical extent of soil and ground water contamination The planned total depth of boring B5 was ' 70 feet bsg, as requested by the EHD in their approval letter, however a maximum depth of only 60 feet bsg could be achieved due to the presence of heaving sands ' Soil samples from pilot borings MW1 through MW4 were collected ahead of the drill bit using a California modified split-spoon sampler loaded with three pre-cleaned 2-inch by 6-inch brass sleeves The samples were collected from the monitoring well pilot borings at five-foot intervals, IAdvanced GeoEnvironmental,Inc I