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Workplan for Underground Storage Tank Upgrade 2 Southland Store No 17334,4501 North Pershing Avenue,Stockton,California August 10, 1g98 Soil and/or Groundwater Sampling and Waste Disposal Underground storage tank upgrade proceedings will be observed by Fluor Daniel GTI personnel If field observations indicate the presence of hydrocarbons (i a soil discoloration, hydrocarbon odors, or elevated photoionization detector readings), soil (and grab groundwater samples, if appropriate) will be collected in accordance with SJCDEH requirements Sampling locations will be determined in the field after consultation with the SJCDEH In addtion to the required soil samples to be collected from beneath the existing USTs and dispenser island, four soil samples will be collected from the floor of the proposed excavation to accomodate the new USTs Soil samples will be collected in an undisturbed state from the backhoe bucket or using a hand-auger slide-sample barrel fitted with 2-inch-diameter by 6-inch-long brass sample tubes All sampling equipment will be cleaned between sampling intervals with TSP detergent, followed by successive rinses of tap and distilled water Samples to be potentially submitted for analysis will be sealed with . aluminum foil, capped with plastic caps, taped, labeled, and placed on ice in an insulated container All soil samples to be analyzed will be delivered to a state-certified laboratory under legal chain-of- custody Sampling will be conducted in accordance with Southland Corporation/Fluor Daniel GTI Standard Operating Procedures (Attachment A) Sample analysis will be for total petroleum hydrocarbons as gasoline (TPHg), and benzene, toluene, ethyfbenzene, and total xylenes (BTEX) following EPA Method 801518020, and the oxygenates tertiary butanol (TBA), methyl-tertiary-butyl ether(MTBE), di-isopropyl ether(DIPE), ethyl-tertiary-butyl ether(ETRE), tertiary-amyl-methyl ether (TAME) following EPA Method 8260 Groundwater is not expected to be encountered during the tank removal or excavation of the new tank pit, however, if groundwater is encountered, grab groundwater samples will be collected from the excavation area in accordance with Southland Corporation/Fluor Daniel GTI Standard Operating Procedures (Attachment A) Groundwater samples will be collected using disposable sampling bailers, poured into 40-milliliter VOA vials to zero headspace, and sealed with screw-on caps with Teflon septa Each sample will be acidified, labeled, and placed on ice for delivery under legal chain-of-custody to a state-certified laboratory for analysis for TPHg and BTEX following EPA Method 8015160218020, and for the oxygenates TBA, MTBE, DIPE, ETBE, and TAME by EPA Method 8260 01 17334SJC LTR FLUOR DANIEL GTI ir`J