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rre <br /> REVISED ADDITIONAL ASSESSMENT WORKPLAN <br /> JAY'S MINI-MART,STOCKTON <br /> SEPTEMBER 2003 <br /> Permits and Site Access <br /> GHH will obtain the required boring permits and workplan approval from the County prior to <br /> drilling the proposed soil borings. All investigation work is proposed to be on site so no rights <br /> of entry or encroachment permits will be required. <br /> Utility Survey <br /> The Underground Services Alert (USA) network will be contacted at least 48 hours before <br /> drilling operations begin to locate underground utilities on the site and adjacent public right- <br /> of-ways. The first 5-feet of each boring will be hand augured as a further precaution to avoid <br /> underground utilities. <br /> PROPOSED FIELD ACTIVITIES <br /> Monitoring Well Installation <br /> Based on the data collected on May 22-23, 2003 and reported in the A.A.R, GHH proposes to <br /> install three groundwater monitoring wells in the locations shown on Figure 5. The new wells <br /> will be used to monitor the vertical and horizontal extent of impacted groundwater. The new <br /> wells will also provide information on the gradient and direction of groundwater flow. The <br /> anticipated construction detail is shown on Figure 6. Drilling and well installation activities will <br /> be reviewed by a California Registered Geologist or Licensed Civil Engineer. <br /> Drilling will be performed by hollow-stem auger drilling techniques using a truck-mounted drill <br /> rig equipped with 8-inch outside diameter hollow-stem augers. Prior to drilling, augers and <br /> associated drilling and soil sampling equipment will be cleaned with a high pressure hot water <br /> washer. To minimize the possibility of cross contamination, the sampling equipment will be <br /> washed and rinsed with distilled water before collecting each soil sample. Drilling and sampling <br /> will be performed according to ASTM Method D 1452-80, Soil Investigation and Sampling by <br /> Auger Borings as described herein. <br /> Soil samples will be collected at 5-foot intervals for classification by the Unified Soil <br /> Classification System(USCS), field screening and for possible chemical analysis. Soil <br /> samples will be collected by placing the augers above the desired sampling depth and then <br /> driving a modified California split-spoon sampler lined with three brass tubes into the <br /> undisturbed soil. <br /> 4 <br />