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Mr. Yoakum May 21, 2014 Page 2 of 3 • USTs#1-3 Area and USTs#5-8 Area; • Waste Water Treatment Area; • Forklift Shop Area and Steam Cleaning Area; • Cherry Building; and • Machine Shop. Soil borings will be advanced to the depths indicated below using a combination of hand-augering and direct-push technology (DPT) drilling methods. At a minimum, the upper five feet will be hand- augered at each location. Soil samples will be logged in accordance with the Unified Soil Classification System (USCS), including color, moisture content, mottling, and presence of staining or odors. In addition, approximately 20 grams of soil from each sample will be screened in the field for VOCs using an organic vapor monitor (OVM) equipped with a photo-ionization detector (PID). Soil samples for laboratory analysis will be retained at select depths (to be determined in the Feld based on observation) using the Macro-CoreTM sampling method. Soil samples for chemical analysis will be submitted to a laboratory for analysis of VOCs using USEPA Method 8260 and Total Petroleum Hydrocarbons (TPH) using USEPA Method 8015M. A description of the investigation activities that will be completed at each AOC is provided below. The actual locations of soil borings may be adjusted in the field based on access restrictions. A map of the approximate locations of the proposed soil borings is attached as Figure 1. • USTs #1-3 Area and USTs #5-8 Area -Twelve soil borings will be advanced in the UST #1-3 and UST #5-8 areas to an approximate depth of 20 ft-bgs. A total of twelve soil samples will be submitted for laboratory analysis. • Waste Water Treatment Area - Three soil borings will be advanced in the Waste Water Treatment Area to an approximate depth of 20 ft-bgs or first encountered groundwater, whichever is shallower. A total of three samples will be submitted for laboratory analysis. • Forklift Shop Area and Steam Cleaning Area - Five soil borings will be advanced within the Forklift Shop Service Area to an approximate depth of 5 to 7 ft-bgs. A total of five soil samples will be submitted for laboratory analysis. • Cherry Building - Five soil borings will be advanced near the Cherry Building to an approximate depth of 5 to 7 ft-bgs. Five soil samples will be submitted for laboratory analysis. • Machine Shop - Three soil borings will be advanced near the Machine Shop to an approximate depth of 5 to 7 ft-bg. A total of three soil samples will be submitted for laboratory analysis. Upon completion of sampling activities, all borings will be backfilled pursuant to San Joaquin County Department of Environmental Health. The Source Group,Inc.