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Section 1 Project and Site Background Introduction WJM Consulting& Engineering(WJM)and Shoreline Engineering were retained by Kier&Wright and the property owner, LBA Realty(LBA),to conduct soils suitability and nitrate loading studies for the proposed warehousing development located Tracy,California, in accordance with the requirements of the San Joaquin County Environmental Health Department(SJCEHD). This report is the first of two(2) reports and addresses nitrate loading. The soil suitability study will follow. Proposed Development The development proposed at the site includes approximately 490,000 square feet of additional warehousing space located on 23.47 acres currently undeveloped. The facility and parking provides for a maximum of 490 employees, and numerous trucks used to deliver and pick-up product. Areas on the site will be reserved for a domestic well,fire well,and appurtenances for each;storm runoff detention; and approximately 77,000 square feet of landscaping(see Exhibit A). The project is "low water use," as no process water will be used. Water use will solely be for employee consumption,sanitation and fire protection. Site Description The project is located at 14900 West Schulte Road,Tracy, California, parcel number APN 209-24-034. The parcel is 46.42 acres and is partially developed. Ground elevations range from approximately 175' (southwest)to approximately 125' (northeast),sloping to the north at roughly 1.6%. The site currently includes a 299,000 square foot building located on the southern 22.95 acres of the parcel. The existing building water use consists of two bathrooms (male/female)for 5-10 employees. The water and sewer services to the new building will be independent of the existing structure. The County zoning for the parcel is industrial (industrial warehousing with no cafeteria). The northern 23.47 acres of the parcel is currently undeveloped, nor is it being used for other purposes(i.e.farming). Groundwater According to the State Department of Water Resources groundwater data base,the groundwater surface elevation is approximately 60' MSL,which would place the water table at approximately 65' below the proposed leach field area. ' However,the project has constructed two(2)wells at site (December,2017), and found a static groundwater elevation of approximately-10' MSL(160' below ground elevation). Numerous soil borings to 50' below ground surface conducted at the site in 2016 found no indication of groundwater. Data is insufficient to determine the groundwater gradient. ' DWR Interactive GW Map(httos://Ris.water.ca.gov/aoo/¢icima/#bookmark GroundwaterElevation) 1Page