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�. ..i 16 December 1999 AGE-NC Project No. 95-0184 Page 2 of 6 sparging(IAS)pilot test and a ground water extraction pilot test will be performed at the site. A Site Health& Safety Plan is currently on file with the PHS-EHD for the referenced site. 3.1. WELL INSTALLATION IGG��f�'tAf Borings will be advanced in the parking lane on the south side of Miner Avenue, southeast of the site, in the sidewalk on the north side of Miner Avenue east of the site and inside the building at 825 Miner Avenue,to total depths of 45 feet below surface grade (bsg), using a drill rig equipped with 8-inch diameter hollow-stem augers. The borings will be completed as a ground water monitoring wells with 20 feet of screened casing installed from approximately 25 to 45 feet bsg. Soil samples will be collected at 5-foot intervals, beginning at a depth of 20 feet bsg. One boring will be advanced in the sidewalk on the east side of Grant Street, approximately 25 feet north of the site. Soil samples will be collected at 5-foot intervals,beginning at a depth of 5 feet bsg. The boring will be completed as a ground water monitoring well as described above. However, if hydrocarbon-impacted soil is encountered in the vadose zone, the length of screened casing will be extended upward through the impacted soil, a maximum of 10 additional feet of screened casing, for additional use as a vapor extraction well. One boring will be advanced approximately 10 feet east of MW-4 to a total depth of 45 feet bsg, using 10-inch diameter hollow-stem augers. Soil samples will be collected a five-foot intervals, beginning at a depth of 5 feet bsg. The boring will be dual-completed with screened intervals from 10 to 20 feet bsg and from 25 to 45 feet bsg. The lower screened interval will be used for monitoring ground water and possible detection and removal of remaining free product, if present. Procedures for the advancement of the borings and the installation of the wells are described in Sections 4.1. through 4.3. The monitoring well design is illustrated on Figure 3; the dual-completed well design is illustrated on Figure 4. The proposed well locations are depicted on Figure 2. The precise boring locations will be based upon access agreements with the City of Stockton and the locations of underground and overhead utilities. An encroachment permit will be obtained from the City of Stockton prior to commencement of drilling in the city right-of-way. Drilling permits will be obtained from the PHS-EHD. 3.2. SOIL SAMPLE ANALYSES Selected soil samples will be analyzed by a State of California Department of Health Services (DHS)-certified laboratory for the following constituents: Advanced GeoEnvironmental,Inc.