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� v Wm. J. Hunter & Associates ., 2220 Loma Vista Dr. Registered Geologists _, '_ .�_ 3 I_i/;Sacramento, CA 95825 r" (. t Petroleum& Mineral Appraisers -, (916) 972-7941 Ap"' FAX (9 16) 972-1683 April 3 , 1997 Linda Turkatte, Sr. REHS San Joaquin County PHS Environmental Health Division P.O. Box 388 Stockton, CA 95201-0388 Ref : Marci ' s Diesel Service, 2969 Loomis Road, Stockton CA Site Code 2015 Dear Linda; As instructed by your office, we have enclosed a workplan for placing one (1) 4" groundwater monitoring well on the above site. Once approval is received, we will assist the Marci ' s in selecting bids and obtaining pre-approval from the Cleanup Fund staff . Although we have not made an estimate of costs to do the work, the placement of the soil boring by Lush Geosciences cost approximately $8300, not including well completion or water sampling. We wish to go on record that we do not believe this additional work is justified based upon the data available to date. There is no evidence that the contamination has migrated very far from the source, and the technology for remediating clayey soils in situ at these depths does not exist . Excavation is not a viable option at these depths, and would require the removal of the building on the property. Many sampling events have shown that the gradient is divergent, which supports our belief that the aquifer is very limited in size and has extremely low porosity & permeability. This is indicated by the fact that the potentiometric surface is below 80 ' (based on the Lush soil boring, ) but the static level in the wells is about 681 . Releasing the confining pressure allows the water to reach equilibrium. It is apparent that there is little or no horizontal communication with other sands . Please give us a call if you have any questions . Since , Wm. n er CC : Marci Garrison Law Corp .