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PROPERTY OWNER: George Lechich, P.O. Box 881, Stockton, CA 95201 ; (209) 466-5771 or (408) 372-5473. CONTACT PERSON: Mike Griffin, (209) 466-5311 LEGAL DESCRIPTION: Assessor' s parcel No. 135-450-23, consisting of approximately 1/10th of an acre. Refer to prior reports for more details. DEPTH TO GROUNDWATER: Based upon data from the three monitoring wells on the property, the water table is about 13. 5' bgl. The gradient is to the north/northeast, which agrees closely with regional data. BRIEF SUMMARY OF PRIOR WORK PERFORMED ON THE SITE: February, _1988 - 500 gallon UST which had contained gasoline was removed from site. A soil sample taken at 13' bgl revealed the presence of petroleum hydrocarbons. Spoil was returned to hole & no further work done. February & March. 1994 - Three (3) groundwater monitoring wells were placed on the property as shown on PLATE III . Wells #1 & #3 did not reveal any contamination in either soil or groundwater samples. However, MW-2, in a downgradient position from the removed UST, measured BTEX & TPH-G in both soil & water samples; refer to TABLE I for details. Hydraulic gradient indicated to be to the north. For more details of that work, refer to the report titled "Site Assessment Report and Laboratory Analysis of Soil & Groundwater Samples to Define Contamination from Leaking UST" dated April 25, 1994, prepared by Wm. J. Hunter & Associates. June, 1994 - First quarterly monitoring revealed the presence of BTEX & TPH-G in MW-2; levels were lower than first recorded. MW--2 & MW-3 still below detection levels as shown on TABLE II . Gradient still to the north. September, 1994 - Second quarterly monitoring measured continued lower levels of BTEX; however, TPH-G had increased significantly. MW-2 & MW--3 still below detection limits_ Hydraulic gradient has shifted about 40 degrees to the northeast. 2