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02 June 2000 <br /> AGE-NC Project No. 98-0466 <br /> Page 4 of 7 <br /> 3.1. SOIL AND GROUNDWATER INVESTIGATION <br /> AGE proposes to meet assessment objectives by advancing two soil borings in each septic leach field <br /> three shallow hand-auger borings and one probe boring in the western:(Dames <br /> h area to collect soil and <br /> ground water samples for laboratory analysis. <br /> Ground water has been reported at a depth of approximately 35 feet & Moore, April <br /> 1999, Quarterly Groundwater Monitoring Report - March 1999) in well DMW2, located on the <br /> southern portion of the site, approximately 1,200 feet south of the western ditch area, 1,300 feet <br /> southwest of the warehouse (southern) septic leach field, and 2,650 feet south southeast of the <br /> Millworks (northern) septic leach field. Ground water was encountered in soil borings in the same <br /> general area as DMW2 at approximately 30 feet bsg by AGE during a revious investigation of a <br /> former UST site in 1999. <br /> Soil samples will be collected at 5-foot intervals from 5 feet bsg to otal depth. Ground water <br /> samples will be collected near the top of the saturated zone, anticipated to be at total depth in the <br /> deeper borings. The hand-auger borings will be advanced to 5 feet bsg; soil samples will be collected <br /> at 2 feet bsg and 5 feet bsg. The soil samples will be analyzed for the analytes noted above and <br /> specified below in Section 4.5. A report of findings will be prepared and will be reviewed and <br /> approved by a California Registered Geologist. <br /> 3.2. SOIL AND GROUND WATER SAMPLING <br /> Soil probe borings will be advanced utilizing a van-or truck-mounted Ge probe 5400 equipped with <br /> a soil sampling device. Proposed soil probe boring locations are illustrat on Figure 2. Soil samples <br /> will be collected at intervals as described above. <br /> Hand-auger borings will be advanced at approximate 50-foot interval'Is along the ditch bottom <br /> utilizing a common hand auger assembly.Upon reaching the desired sampling depth, a soil sample <br /> will be collected utilizing a hammer-driven metric soil sampler loaded,with one 2-inch by 6-inch <br /> brass sleeve or two 2-inch by 3-inch brass sleeves. <br /> Upon recovering the soil-filled brass-sleeves,the leading brass sleeve wio be preserved by covering <br /> the open ends with a sheet of Teflon, capping, and sealing with duct tape. Labels with the boring <br /> designation, sampling depth, sampling date and time, and the sampler's initials will be put on each <br /> preserved sample. The properly preserved samples will be recorded on a chain-of-custody and will <br /> be stored in a chilled container pending shipment to a California Department of Health Services <br /> (DHS)-certified analytical laboratory for analysis. <br /> Grab ground water samples will be collected though a Geoprobe ground water sampling device. It <br /> Advanced GeoEnvironmental,Inc. <br />