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Preliminary Site Assessment Work Plan - July 1998 California Natural Products, Inc., APN#s -198-10-18 and 198-09-17 2020 E. Park and 2440 E. Louise Avenue Lathrop , California 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with a request from Mr. Pat Mitchell of California Natural Products, Inc.,Advanced GeoEnvironmental, Inc. (AGE)has prepared the enclosed Preliminary Site Assessment Work Plan for two agricultural parcels located at in Lathrop, California. Site addresses for the two adjoining parcels are uncertain, but are thought to be 2020 E. Park Street and 2440 E. Louise Avenue. Also included is a site-specific health and safety plan, a drilling permit application and permit fee. The scope of work is to advanced five soil probe borings to 20 feet below surface grade (bsg)to collect ground water samples. The objective is to assess impacts to the parcels, if any, via ground water from nearby sites. The location of the parcels is illustrated in Figure 1 -Location Map. A plan of the site is depicted in Figure 2 -Site Plan. This work plan is prepared in accordance with San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD)and the Central Valley Regional Water Quality Control Board guidelines for the investigation of UST sites 2.0. BACKGROUND 2.1. SITE LOCATION The parcels are located in the southwest quarter of Section 25, Township 1 South, Range 6 East, Mount Diablo Base and Meridian (MDB&M). Parcel 17 occupies 29.68 acres,parcel 18 occupies 16.45 acres, according to Maps 09 and 10,respectively, in Book 198 of the San Joaquin County Tax Assessors' Office The parcels are located in Lathrop, California, north of Louise Avenue, east of Park Street and further east of McKinley Road,well south of Lathrop Road,west of the Union Pacific Railroad Line and further west of a former Magnesium plant. The parcels are in an agricultural/ commercial/industrial area of low topographic relief at an elevation between 20 and 25 feet above Z mean sea level. The regional slope of the area is gently toward the southwest. The surface of the parcels are unpaved and are utilized for agricultural purposes. No structures are present on the parcels. The only known use of the parcels has been for agricultural purposes. 2.3. REGIONAL GROUND WATER ELEVATION The subject property is located just outside the contoured areas on the maps titled Lines of Equal Advanced GeoEnvironmental,Inc.