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PRELIMINARY SITE INVESTIGATION REPORT Tradeway Chevrolet 1460 East Yosemite, Manteca, California APPENDIX A FIELD PROCEDURES AND PROTOCOLS All field procedures were overseen by an AGE representative. Procedures for the advancement of soil probe borings, soil and ground water sampling, equipment decontamination, boring abandonment, and sample shipment are outlined below. A.I. PROBE BORING ADVANCEMENT Probe borings were advanced by Environmental Control Associates using a truck -mounted Geoprobe 5400 direct -push probing unit equipped with 1.25 -inch probing rods. The Geoprobe advances soil probe borings using a hydraulic or pneumatic hammer to drive soil and ground water sampling tools to specified depths. A.2. SOIL SAMPLING PROCEDURES Soil samples were collected using Geoprobe push -driven 2 -inch diameter discrete soil sampler fitted with a two -foot long acetate sleeve. Upon removal from the sampler, the bottom six -inches of the sample sleeve containing soil was separated from the remaining sleeve and retained for possible analysis. The exposed ends of the sleeves were covered with Teflon sheets, capped and sealed with tape. Soils encountered in the borings were visually classified by an AGE geologist in accordance with the Unified Soil Classification System (USCS). Additionally, soil samples were field screened for the presence of volatile organic compounds using an organic vapor meter (OVM). Following sample collection, each preserved sample sleeve was labeled with the boring location, depth, time, date and sampler's initials. Appropriately sealed and labeled samples were placed in a chilled container under ice and transported under chain -of -custody procedure to a DHS -certified laboratory. A.3. GROUND WATER SAMPLING PROCEDURES A ground water sample was collected from the soil probe boring following soil sample collection. Depth discrete ground water samples were collected using a Geoprobe push -driven water sampling assembly fitted with a pre -cleaned one -inch diameter 0.010 -inch slotted PVC well screen. Once ground water was encountered, a Geoprobe push -driven water sampling device was advanced four to five feet into the water -bearing zone. Subsequently, the sampling assembly was withdrawn approximately four to five feet exposing the well screen to the sampling interval. In-situ ground Advanced CeoEnvironmental, Inc.