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26 October 2000 <br /> AGE-NC Project No. 98-0466 <br /> Page 5 of 8 <br /> for laboratory analysis. Surface soil samples will also be collected in the latter area to assess for <br /> TPH-mo and target metals. <br /> Ground water has been reported at a depth of approximately 35 feet bsg (Dames & 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 westem ditch area, 1,300 feet <br /> southwest of the warehouse (southern) septic leach field, and 2,650 f�et 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�Irevious investigation of a <br /> former UST site in 1999. Additionally, ground water was encountered. in one soil boring in the <br /> Millworks septic leach field at approximately 40 feet bsg by AG during the June 2000 <br /> investigation. However, one soil boring advanced to 45 feet bsg near the Maintenance septic leach <br /> field was unsuccessful in reaching ground water due to refusal. <br /> 3.2. SOIL AND GROUND WATER SAMPLING <br /> AGE proposes to advance seven soil hollow-stem auger borings at the site as part of site assessment <br /> activities. Proposed boring locations are illustrated in Figures 2 and 3. <br /> Soil samples will be collected at 2 feet bsg and at 5-foot intervals from 5 feet bsg to total depth, <br /> approximately 40 to 50 feet bsg, depending on the occurrence of saturated soil samples. Ground <br /> water samples will be collected near the top of the saturated zone, anticif ated to be at total depth in <br /> the borings. The shallow soil borings will be advanced to between 10 and 15 feet bsg. The soil <br /> samples will be analyzed for the analytes noted above and specified belo in Section 4.6. A report <br /> of findings will be prepared and will be reviewed and approved by a Califgmia Registered Geologist. <br /> Properly preserved soil and grab ground water samples will be stored in a chilled container pending <br /> shipment, under chain-of-custody, to a California Department of Health Services (DHS)-certified <br /> analytical laboratory. Soil sample duplicates will be visually described in accordance with the <br /> Unified Soil Classification System on boring logs recorded in the field. <br /> 4.0. PROCEDURES <br /> Samples will be procured for the additional soil and ground water investigation utilizing a truck- <br /> mounted, hollow stem drill rig equipped with 8-inch diameter hollow-stem augers. The procedures <br /> presented below for advancement of soil borings and collection of soil and ground water samples <br /> will be modified as site conditions warrant with PHS-EHD approval. <br /> Advanced GeoEnvironmental,Inc. <br />