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• In a letter from the EHD dated August 1 , 1995, they requested an <br /> additional well to the jeS�rt of well BM-9. Also an investigation <br /> of the subsurface data available at present, we are proposing an <br /> additional boring on the northeast side of the site. <br /> SCOPE OF WORK <br /> We Propose to drill one additional well BW-12 and one additional <br /> boring B-2 . The proposed locations are shown on Fig. 2 . The <br /> well will be drilled, completed, developed and sampled according <br /> the QA/QC protocols attached. The boring will be drilled, <br /> sampled and destroyed with neat cement. <br /> The well (BW-12) is located on City of Stockton property in the <br /> sidewalk of Stanislaus St. The boring is located on private <br /> property. The drilling, development, surveying and sampling <br /> will take about 2 weeks. Once this work plan is approved, we will <br /> submit a permit application for the well , to the Environmental <br /> Management Department. An active drilling permit exist for the <br /> property where the boring is to be placed. <br /> The reason for the location of the well is to attempt to define <br /> the source of the TPH concentrated groundwater plume an the area <br /> around the Sun Gardens restaurant and the ARCO Station. <br /> • The reason for the boring is to obtain information about the <br /> limits of the unsaturated zone contaminants at this site. <br /> The well will be drilled to a depth of at least 65 feet, which is <br /> projected to be 10 feet below the water table. In previous wells <br /> the top of a clay zone was found about 55 feet below the surface. <br /> The well will be constructed using 2 inch PVC slotted casing from <br /> 40 feet below the surface (bgs) to 65 feet bgs. Blank casing <br /> will be placed from the surface to 40 feet. Number 3 sand will be <br /> placed opposite the slotted casing and up to a level of 35 feet. <br /> A bentonite seal made of hydrated bentonite chips will be placed <br /> from 35 to 32 feet to inhibit the cement slurry infiltration into <br /> the sand pack. A well seal of neat cement with 5% bentonite will <br /> be placed in the annulus from 32 feet to the surface. The well <br /> will be capped with a steel traffic box. See Figure 4. <br /> Page 2 <br />