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Ms. Lori Duncan August 31, 2005 Page 3 Project No.: 880-039.1A.01010000 hydrocarbons. The model will encompass the subsurface from the lower vadose zone through the greatest depth of gasoline constituent impact that is determined. The model will present the inferred lateral and vertical limits of gasoline constituent impact. It will be used to determine whether the potential zone of treatment may be considered a single zone or whether treatment may need to address multiple discrete zones (for example, in separate sands that are situated above and below a low -permeability unit). INSTALLATION OF WELLS AND AIR SPARGE TESTING In their July 26th letter, the SJC/EHD advised Shaw that temporary wells are not routinely permitted in the County, and requested that a more detailed description of the proposed air sparge testing procedures be submitted before approval of the test would be granted. At this time, Shaw is proposing to withdraw installation of the temporary wells and performance of the air sparge test from the scope of work in the Work Plan. Shaw believes that after the site investigation work proposed above is completed, a separate work plan for air sparge testing or other remedial action may be developed based on the updated site conceptual model. CONCLUSIONS Shaw is prepared to proceed with the scope of work presented in the Work Plan, as amended by this addendum, upon approval by the SJC/EHD. Please call Mr. Wynne at (916) 565-4184 if you have questions regarding this submittal, or other aspects of the project. Sincerely, SHAW ENVIRONMENTAL, �QR FESS/0& U Q 55798 Andrew Lehane EXP./S%'1,VX Senior Engineer CIVI\- Attachments: Figure 1 — SiteUatim Dan Wynne Project Manager cc: Don Rodgers, 11190 S. Union Road, Manteca, CA 95336 NAPROJECTSU Group\Don Rodgers\work plan addendum.doc SHAW ENVIRONMENTAL, INC.