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Cla%-ton Grant Trigger Pam, Honigman Miller Schwartz and Cohn Clayton Proposal No. 975FOEMR43 i October 7, 1997 of any of the borings, drilling may be advanced an additional 4 to 8 feet to determine if the vertical impact varies with depth. Clayton will advise the client prior to incurring any additional costs. The GeoProbe technique typically penetrates the subsurface in four- foot intervals and collects a continuous core inside a plastic liner. The recovered soil cores will be observed for odor, staining, and presence of volatile organic compound (VOCs) based on photoionization device (PID) readings (one reading per sample liner). Soil intervals selected for laboratory analysis will be cut from the main core, sealed with teflon tape and plastic end caps, labeled, and placed in cold storage for transportation to the analytical laboratory under formal chain-of-custody. Clayton will retain one sample from each four-foot probe interval in the event additional testing becomes necessary. Based on field screening results, one soil sample per boring will be selected for laboratory analysis. Soil cuttings will be field screened by a PID. If no indication of potential contaminants are detected by observation or PID readings, a soil sample from about the 3.5 to 4 foot range will then be submitted for testing to confirm the limited depth of TRPH impact in the-areas of concern. If elevated PID readings are detected or observations indicate contamina ion during field screening, the number of soil samples submitted for laborafory analysis may vary and the boring may be extended. The samples in the vicinity of the oil/water separator will be collected at depths greater than the base of the separator and associated piping to evaluate the potential for releases to have occurred from this device. Clayton does not anticipate that this sampling plan will penetrate the groundwater table. Should groundwater be encountered, a grab groundwater sample will be collected from each boring, if possible, and the water sample may be submitted in place of the soil sample. The depth to groundwater at the subject property is believed to be approximately 60 feet below the ground surface. Groundwater samples will be collected using a stainless steel bailer. The samples will be decanted from the bailer into an appropriate container for the analytical method proposed. The containers will be capped, labeled and placed into an ice filled chest. After sampling is completed, the boreholes will be backfilled with neat cement. Soil cuttings will be placed in a five gallon bucket. The bucket will be labeled and temporarily stored onsite pending appropriate disposal. Since the quality of the soil and groundwater is unknown, Clayton has not provided an estimate for disposal costs of the drilling wastes. Task 3: Laboratory Analysis Clayton proposes to submit up to 7 soil samples for chemical analysis by the following methods on a five-day turn-around-time at Clayton's State-certified laboratory in Pleasanton, California. All samples will be tested for TRPH: however, only the samples collected in the vicinity of the oil/water separator will be tested for TRPH, VOCs, and metals USEPA Method 418.1/Silica Gel Extraction: Total Recoverable Petroleum Hydrocarbons (TRPH) K:IEMRTROPOSALUI ASEl\97. 31.WPD