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PARSCIVS � <br />Parsons Engineering Science, Inc. A Unit of Parsons Infrastructure & Technology Group Inc. <br />2101 Webster Street • Suite 700 • Oakland, California 94612 • (510) 891-9085 • Fax (510) 835-4355 <br />December 11, 1998 <br />Ref: 729801 <br />California Regional Water Quality Control Board <br />Central Valley Region <br />3443 Routier Road, Suite A <br />Sacramento, California 95827-3098 <br />Attention: Mr. Philip S. Isorena <br />Subject: Additional Hydropunch Groundwater Sampling <br />Applied Aerospace Structures Corporation Facility <br />Stockton, California <br />Dear Mr. Isorena: <br />Per your request in your letter of October 13, 1998, addressed to Mr. Werner Sicvol, BP Oil <br />Company, Parsons Engineering Science, Inc. (Parsons) has performed additional groundwater <br />sampling with the objective of further delineating the extent of contamination to the north of <br />the Former Hazardous Materials/Waste Storage Area. On November 2 and 3, four borings <br />were drilled along the north property line in the vicinity of MW -9. A groundwater sample was <br />collected from the bottom of each boring at 50 to 55 feet below the ground surface using a <br />HydropunchTM drive point apparatus. The samples were analyzed for,chlorinated VOCs and <br />the results are summarized in Table 1. <br />Concentrations of the chemicals of concern in the vicinity of the source area are also depicted <br />on Figure 1 along with the most recent groundwater sampling results. The values shown for <br />monitoring wells Ore preliminary results from the fourth quarterly sampling completed on <br />November 19, 1998. The figure indicates that the results from the current boring <br />HydropunchTM samples are generally compatible with results from MW -9 and MW -3, the result <br />from B-111 being somewhat higher. Our recent letter report regarding capture zone simulation <br />(Parsons, December 4, 1998), indicates that MW -9 and the new borings are contained within <br />the probable capture zone that would be created by pumping the groundwater extraction wells. <br />Please call me at (510) 891-9085 or contact Mr. Werner Sicvol at (216) 586-5605 if you have <br />any questions or require clarification. <br />Very truly yours, <br />PARSONS E ERING SCIENCE, INC. <br />Frederick C. intzer, C.E.G. <br />Project Manager <br />Enclosed: Table 1 and Figure 1 <br />cc: Mr. Werner Sicvol, BP Oil Co. <br />Mr. Lon Kitagawa, Applied Aerospace Structures Corp. <br />PUNCHLET 12/10/98 <br />KJPARSONS <br />