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oological Technics Inc. Page 2 Groundwater Monitoring Report Project No, 989.2 April 25,2402 BACKGROUND The site is located at 1401 W. Fremont Street, Stockton, California. It consists of ' approximately 0.26 acres: Assessor's parcel No. 135-25-31. Prior work on the property includes: ' June 1994 —Two 1,000 gallon gasoline USTs, product lines and pumps were removed from the property. There was contamination noted during tank removal. After taking soil samples, the soil was returned to the excavated pit. October 1994 — Approximately 128 cubic yards of contaminated soil were removed from ' the site and disposed of at a licensed landfill. Soil samples were taken and the hole was filled with clean material and covered with asphalt. August 3, 1995 — Three soil borings (S13-1, SB-2 & S13-3) and three groundwater monitoring wells (MW-1, MW-2 & MW-3) were placed on the property under the supervision of a registered geologist from Wm. J Hunter & Associates. August 25, 1998 —Three soil/water GeoProbes (GP-1, GP-2 & GP-3) were placed along the south side of the building in an attempt to define better the limits of the soil and ygroundwater plume. August 15, 2000 — Three additional groundwater monitoring wells (MW-4, MW-5 & MW- 6) were installed along the east side of the building in an attempt to define better the lateral limits of the groundwater plume. 1.0 SITE OBSERVATIONS Valley Wholesale Drug Company is bordered by Sierra Occupational Services Medical Clinic to the west and by Larson Marine to the east. Larson Marine is a boat sales business with a boat repair and maintenance facility on site. The Larson Marine property is elevated approximately two feet above Valley Wholesale Drug Company property. A 21-inch diameter storm drain runs between the two properties and empties into the main channel ' located under Interstate 5. Three grated manhole covers are located along a trench-like basin formed by sloping asphalt above the storm drain. ' Seventeen (17) groundwater monitoring events have been performed on MW-1, MW-2 and MW-3 since August of 1995. Six (6) groundwater monitoring events have been performed on MW-4, MW-5 and MW-6 at the site since August of 2000. Monitoring well locations ' are located on the Site Map, Figure 2.