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21 October 2013 AGE Project No. 13-2675 Page 3 of 5 SOIL SAMPLING Soil samples will be collected at discreet five-foot intervals using a 1.45-inch soil sampling assembly loaded with one two-foot long acetate liner. Upon sample retrieval, a portion of the acetate liner will be separated and the ends will be covered with Teflon sheets, capped and sealed with tape. Appropriately sealed and labeled samples will be placed in a chilled container under ice and transported under chain-of-custody procedure to a CDPH-certified laboratory. Each sample sleeve will be labeled with the boring designation, depth, time, date and sampler's initials. Additionally, soil sample duplicates will be field-screened for the presence of volatile organic compounds using an organic vapor meter (OVM), equipped with photo-ionization detector (PID). GRAB GROUNDWATER SAMPLING Grab groundwater samples will be collected from the four soil borings advanced to approximately 30 feet bsg. For collection of grab groundwater samples, a Geoprobe (or similar) push-driven water sampling device will be advanced four feet into the water- bearing zone. Grab groundwater samples will be collected using a Geoprobe water sampling assembly fitted with a pre-cleaned,one-inch diameter 0.01-slotted temporary well screen. Each groundwater sample will be extracted by dedicated disposable polyethylene tubing through the hollow center of the push rods into the screen section. Samples will be analyzed for TPH and VOCs and will be collected into laboratory-supplied, non-preserved 40-ml Volatile Organic Analysis (VOA) vials and one-liter amber glass containers. Appropriately sealed and labeled samples will be placed in a chilled container under ice and transported under chain-of-custody procedure to a CDPH-certified laboratory. Each sample container will be labeled with sample designation, time, date and sampler's initials. SOIL VAPOR SAMPLING Soil-vapor samples will be collected at depths of approximately five feet and ten feet bsg in the borings advanced for collection of soil-vapor samples. Samples will be collected using a Geoprobe soil-vapor assembly. An expendable vapor point will be placed into a point holder at the bottom of an assembly of 1.25-inch diameter hollow drive rods. The assembly will then be advanced to the specified depth and retracted approximately six to twelve inches in order to disengage the expendable point and expose a column of strata from which soil-vapor can be extracted. Advanced GeoEnvironmental,Inc.