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08/16/95 WED 14:40 FAX 916 366 7015 KLEINFELDER STOCKTON 0004 KLEINFELDER Two angled soil borings will be drilled from outside the containment wall to assess the potential presence of petroleum hydrocarbons in the subsurface beneath each tank Additionally, one vertical boring will be drilled adjacent to each of the two fuel dispensers located outside the containment wall. The six borings will be drilled to an approximate depth of 25 feet using a truck-mounted drill rig equipped with 6-inch hollow stem augers. The depth to groundwater is estimated at 30 feet. Soil samples will be collected at approximately 5 foot intervals to the termination depth of each boring for lithologiw:logging and laboratory analysis. The collected soil samples will be screened in the field using a photo-ionization detector (PID) to assess the potential presence of petroleum hydrocarbons and to assist in selecting samples for laboratory analysis. The borings will be drilled, logged, and sampled following the protocol described in Attachment B, Seetinns R-2 I through R-0..4, and closed as described in Section B.2.7. Task 3 -Laboratory Analysis Six samples collected from each of the four angled soil borings (total of 24 samples) drilled to asssess soil beneath the former AGST locations will be submitted for laboratory analysis. These samples will be collected from the ground surface and depths of 5, 10, 15, 20, and 25 feet. Two soil samples collected from each vertical boring drilled adjacent to the fuel dispensers (total of four samples) will be selected for laboratory analysis based on qualitative screening results and field observations. At Independrnt Tnlrking company's request, the samples will be submitted under chain-nf-custody procedures to BC LAboratoriet of Bakersfield, Califomia. Tho oamploo will be submitted for the following analyses: • TPH extractable(diesel range)by Method 8015M/3550 • TPH purgeable(gasoline range)by Mahod 8015M/5030 • BTEX by EPA Method 8020 The samples will be analyzed on a normal laboratory schedule requiring approximately 10 working days for completion. Meinfelder assumes that BC Laboratories is certified by the California Department of Toxic Substances Control for the requested analysis. Task 4 - Summary Report Upon completion of the field activities, and receipt and review of analytical results, a brief summary report will be prepared for client review and agency submittal. The report will include: • A description of field activities, observations, and protocols. • Lithologic logs and, if appropriate, interpreted geologic cross sections. • Map showing drilling and sampling locations. • Tabulated results of soil sample analysis with copies of certified analytical laboratory results. • Description and documentation of QA/QC procedures employed for field and laboratory work- 0 ork• Recommendations if warranted. 23-YP46%/IP950035(1995) Page 2 of 3 July 20, 1995 Copyright 1995 Kleinfelder,Inc.