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Wm. J. Hunter & Associates 2220 Loma Vista Dr. Registered Geologists Sacramento, CA 95825 Petroleum &Mineral Appraisers (916) 972-7941 FAX (916) 972-1683 WORKPLAN FOR PLACING TWO (2) GROUNDWATER MONITIORING WELLS VALLEY WHOLESALE DRUG CO. 1401 W. FREMONT STREET STOCKTON, CA PURPOSE OF WORK: The San Joaquin Co. PHS, Environmental Health Division requires that the lateral limits of the soil & groundwater plume existing beneath the above site be delineated to the north. Two wells are proposed to address that issue. MW-4 will be located as close as possible to the site of GP-3, which was placed near the southeast corner of the existing building. BTEX & TPHg were detected in soil samples at 11' & 17' below grade in that soil probe. The soil sample from 23' bgl was below detection limits. A water sample measured minor amounts of BTEX; TPHg was non-detect. MW-5 will be placed approximately 30 to 40' to the north of MW-4. i PROPERTY LOCATION: The site is located at 1401 W. Fremont Street in the City of Stockton. It consists of approximately .26 acres; the Assessor's parcel No. is 135-25-31. NAME & ADDRESS OF PROPERTY OWNERS: Valley Wholesale Drug Co., Inc., 1401 W. Fremont Street, Stockton CONTACT PERSON: Paul Souva, Controller; (2d9) 466-0131, ext. 224. DEPTH TO GROUNDWATER: Groundwater was measured at an average depth of 9.12' bgl during the December, 1999 sampling event. The depth has ranged from a nigh of 6.39' in April, 1998, to a low of 9.12' in December 1995 & December, 1999. That is a maximum fluctuation of 2.73' over a 4f year period. The hydraulic gradient has been consistently to the north-northeast. BRIEF REVIEW OF PRIOR WORK DONE TO DATE: June, 1994 - Two 1,000 gallon gasoline UST's, product lines, & pumps were removed from the property. There was obvious contamination noted during tank removal. After taking soil samples, the soilwas returned to the hole.