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DUDEK CORPORATE OFFICE 605 THIRD STREET E 760.942.517TCALIFORNIA 92024 T 760.942.5147 T 800.450.1818 F 760.631.0164 V September 05, 2006 E VIIROMIENTPERMI FIEgLrH /SERVICES Harlan Knoll San Joaquin County Environmental Health Department 304 East Weber Avenue 3`d Floor Stockton, CA 95201 Dear Mr. Knoll: Re:Destruction of Two Groundwater Monitoring Wells Located on San Rafael Blvd., Stockton, CA. DUDEK has prepared this letter report describing the destruction of two groundwater monitoring wells (MW), KS-7 and KI-7, located on San Rafael Boulevard., Stockton, CA(Figure 1 and Figure 2). Per well destruction permit number SR0046167, wells KS-7 and KI-7 were destroyed on 06-Apr-06 and 07-Apr-06 by Water Development Corporation(WDC), from Zamora, CA. Dudek oversaw all MW destruction activities. The destruction of the two MWs is described below. Destruction of Groundwater Monitoring Well KS-7 On 06-Apr-06 WDC removed the Tri-Loc purging system and confirmed all obstructions were removed from MW KS-7. The bottom of the MW was tagged at 90-feet feet below land surface (bls) (Appendix A). A 1-inch diameter tremie pipe was lowered to the bottom of MW and approximately 10 cu-ft(100-gallons) of Portland cement was pumped down the MW (Table 1). Dudek calculated approximately 97 gallons of neat cement would be required to backfill the MW casing and gravel pack, assuming the porosity of the gravel pack to equal 35%. Groundwater within the MW casing was pushed to land surface as the neat cement displaced the groundwater in the MW casing. The displaced groundwater was collected in a 55-gallon drum. After the MW casing and filter pack was filled with neat cement, WDC inserted a pneumatic packer into the MW casing. The pneumatic packer was inflated and approximately 68 pounds per square W W W.DUDEK.COM