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Soil samples for volatile compounds such as TPHg and VOCs will be collected, in accordance with the 5035-preparation method (EnCoreTM sampler). Upon sample retrieval, an EnCoreTM sampling device will be pushed into the exposed leading end of the sample liner. As the EnCoreTM device is pushed, an internal piston retracts allowing soil to fill a cylinder to a capacity of either 5 gram (g) or 25g of soil mass, thus preventing formation of head space above the soil within the sampling device. If, during sampling it is not possible to immediately collect soil using the EnCoreTM sampling device, the end of the acetate liner will be capped with a Teflon sheet and a plastic end cap to prevent the loss of volatiles. Once collected, the EnCoreTM sample device will be capped with a locking cap fitted with an "0-ring" seal to prevent loss of volatiles, and will then be placed into a previously labeled foil pouch and sealed. Prior to placing the EnCoreTM sampling device into the foil pouch, a self-adhesive labeled seal is placed onto the locking mechanism to secure it from tampering, and to act as additional field QC of the sample. The secured sample is then placed into a re-sealable plastic bag and put into the insulated chest filled with water ice pending transport to a California certified laboratory for analysis. Soil samples for low- or non-volatile compounds as TPHd, TPHo, SVOCs, metals, PCBs and pH will be collected using the soil within the sample liner. If the sample liner is acetate, approximately six (6) inches of sample liner will be cut from the leading end, and the exposed ends of the liner will be capped with Teflon sheeting and secured with plastic end caps. If either brass or stainless steel, the leading 6-inch long liner will be similarly capped and secured. The sample will then be labeled, placed into a re-sealable plastic bag, and placed into the insulated chest filled with water ice pending transport to a California certified laboratory for analysis. If insufficient soil sample is collected, either an additional sample will be collected from the borehole beginning where the last sample was collected, or the rig will be moved 18 to 24 inches from the initial borehole and sampling will continue at the target depth. Remaining soil will be placed into a re-sealable plastic bag and set aside for approximately two (2) to five (5) minutes, after which time a measure of VOCs will be made using a portable photoionization detector (HD) or equivalent organic vapor analyzer. The soil will then be described by a California Professional Geologist in accordance with the Unified Soil Classification System (USCS) method of soil description. A mobile laboratory may be used during sampling to analyze the samples onsite. If used, additional analysis may be performed by the mobile laboratory at depths other than initially selected to assist in vertical delineation. In addition, sampling may be advanced at other locations to further delineate petroleum hydrocarbons and/or VOCs. The necessity for additional sampling at other locations may also be indicated by high VOC measurements on the PID. The selection of additional sample locations will be at the discretion of the Professional Geologist responsible for this project. The indicated analysis for the PCOCs and COCs at the identified depths is a guideline and may be analyzed at other than their pre-selected depths to further characterize the PCOCs depending on the results of the initial laboratory analysis. Selection of additional analysis will be at the discretion of the Professional Geologist responsible for this project. Golden State Environmental, Inc. - 19 - Los Angeles, San Diego and Houston Revised Work Plan — Soil and GW Characterization July 2006