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nTWININI <br />LABORATORIES, INC. <br />ANALYTICAL CHEMISTRY • ENVIRONMENTAL SERVICES <br />GEOTECHNICAL ENGINEERING • SAMPLING SERVICES <br />CONSTRUCTION INSPECTION & MATERIALS TESTING <br />March 25, 2005 <br />Lodi Unified School District <br />1305 East Vine Street <br />Lodi, California 9 1-1115)1 <br />F93808.01 <br />Attention: Mr. Robert Silvano APR 7 5 7005 <br />ENVIRONMENT HEALTH <br />Re: Results of Soil Sampling and Analysis PER <br />Site: 9505 North West Lane <br />Stockton, California <br />Mr. Silvano <br />The Twining Laboratories, Inc. (Twining) has prepared this letter report to summerize the sampling <br />and analytical procedures and present the analytical results for sampling of the surface and imported <br />fill soil at the above referenced site. The purpose of this investigation was to assess the imported <br />fill material; which had been placed on-site, for potential impacts from constituents of environmental <br />concern. This investigation was preformed solely at the direction of the Lodi Unified School District <br />(LUSD) and was not done at the request of any regulatory agency. <br />This work was commissioned by Mr. Robert Silvano, Construction Project Manager for Lodi <br />Unified School District (client). Mr. Silvano can be contacted at 1305 East Vine Street, Lodi, <br />California, telephone number (209) 331-7219. This investigation was conducted and this report <br />prepared by The Twining Laboratories, Inc. (Twining), Environmental and Geological Services <br />Division. <br />BACKGROUND <br />It is Twining's understanding that fill soil was imported to the site at 9505 North West Lane in <br />Stockton, California to backfill an area that had been over-excavated during construction activities. <br />The LUSD reported to Twining that the excavation covered an area approximately 300 feet long by <br />80 feet wide to depths between 8 and 12 feet below site grade (bsg). According to the site contractor <br />the imported fill material was placed within the excavation to within 2 feet of the ground surface and <br />then native on-site material was brought in finish the backfill to surface grade. Sampling and <br />analysis of the imported fill soil was requested since the source of the imported fill material was <br />unknown. <br />CORPORATE MODESTO VISALIA BAKERSFIELD MONTEREY SACRAMENTO <br />2527 Fresno Street 5253 Jerusalem Court, Suite E 130 North Kelsey St, #H6 3651 Pegasus Drive, #117 501 Ortiz Avenue 5675 Power Inn Road, Suite C <br />Fresno, CA 93721-1804 Modesto, CA 95356-q322 Visalia, CA 93291-90300 Bakersfield, CA 93308-6843 Sand City CA 93955 Sacramento, CA 95824 <br />(559)268-7021 <br />Fax 268-7126 <br />(209)342-2061 <br />Fax 579-1480 <br />(559) 651-8280 <br />Fax 651-8288 <br />(661) 393-5088 <br />Fax 393-4643 <br />(831) 392-1056 <br />Fax 392-1059 <br />(916) 381-9477 <br />Fax 381-9478