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f v August 27, 1996 Page 4 from the soil generated during the excavation of the waste oil UST. If soil in the former UST pit is found to be impacted by petroleum hydrocarbons, some limited over-excavation may be performed. • Soil Aeration and Disposal. PACIFIC will coordinate with the San Joaquin Valley Unified Air Pollution Control District(SJVUAPCD) to obtain approval prior to aerating the excavated soil. Stockpiled soil will be separated according to relative contamination levels in order,to expedite the aeration of the lessor impacted soils to acceptable levels. Once acceptable levels are achieved,the soil will then be used as backfill: • Drainage from Excavated Soil. All excavated soil will be stockpiled on and covered with plastic sheeting. Plastic sheeting will be secured appropriately to prevent infiltration of rain water or surface runoff into stockpiled soil. Similarly,drainage from any wet stockpiled soil will be controlled by the appropriate use of plastic sheeting and hay bales or similar measures, as needed. • Groundwater Extraction during Excavation. Based on regional information groundwater is estimated to be at a depth in excess of 50 feet. It is therefore not anticipated that groundwater will be encountered during excavation activities. If a shallow localized perched groundwater zone is encountered during excavation, extracted groundwater will be stored temporarily onsite and a discharge permit will be obtained prior to disposal to the local POTW. • Soil Sampling and Analyses. Soil samples will be submitted to a California State-certified laboratory and analyzed for the presence of TPH-g, BTEX compounds,and total lead. In addition, selected soil samples collected in the area of the former waste oil tank will also be analyzed for the presence of total oil and-grease,total petroleum hydrocarbons calculated as diesel(TPH-d), methyl tert-butyl ether (MtBE), volatile organic compounds(VOCs), semi-volatile organic compounds (SVOCs), and CAM 17 metals. • Contingency Borings or Wells. In the event that limited excavation _ activities do not adequately define the extent of hydrocarbon impacted soil, an addendum to this CAP outlining further investigation will be prepared. The further investigation, if performed, would most likely consist of the drilling, sampling and installation of one or several soil borings and/or wells. Field and laboratory procedures are presented as Attachment A. 9200391 A/W PLAN