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3. Soil and groundwater samples will be submitted to Kiff Analytical LLC(Kiff),Davis, <br /> California for analysis. Kiff is a-California state certified analytical laboratory. The soil <br /> samples will be analyzed for TPH-gasoline,TPH-diesel, TPH-motor oil,benzene, <br /> toluene, ethylbenzene, and xylene(BTEX),using United State Environmental Protection <br /> Agency(USEPA) Test Methods 8015M and 8260B. Total lead will be analyzed using <br /> USEPA Test Method 9010 from the three soil samples reported to have the highest <br /> petroleum hydrocarbon concentrations. In addition polynuclear aromatic hydrocarbons <br /> (PAHs)will be analyzed by USEPA Test Method 8270 (modified)on the three soil <br /> samples with highest petroleum hydrocarbon concentrations. A total of approximately 24 <br /> to 30 soil samples are anticipated to lie collected and analyzed. A total of two <br /> groundwater samples are anticipated to be collected and analyzed using the same USEPA <br /> Test Methods. <br /> 4. In the event that field observations indicate the strong potential for groundwater <br /> contamination in any of the two soil borings to be drilled outside the former UST pit the <br /> soil borings will be completed as 2-inch diameter groundwater monitoring wells. <br /> Estimated screen will consist of 0.010 size slots and will be set with a twenty-foot interval <br /> extending five feet above first encountered groundwater and fifteen feet below. Based <br /> on estimated depth to first water currently-being about 45 to 50 feet bgs these wells are <br /> anticipated to be drilled to 60 to 65 feet deep with screen set from 40 to 60 or 45 to 65 <br /> E <br /> feet bgs intervals, as appropriate. This plan could change with encountered field <br /> conditions and concurrence with PHSEHD personnel. <br /> I <br /> 5. Conduct an updated Sensitive Receptor Survey of the site in accordance with California <br /> Regional Water Quality Control Board(RWQCB) Tri-regional Board Staff <br /> I Recommendations for Preliminary investigation and.Evaluation of Underground Tank <br />! Sites (RWQCB, 2004). The Sensitive Receptor investigation completed by the previous <br /> investigator is over eight-years old at this point and may not accurate reflect current <br /> i <br /> receptor locations. This sensitive receptor investigation will also include onsite sampling <br /> of the ST&E water supply well in accordance with the sampling protocol outlined in <br /> MainlDTovironmcntal\lSTElWorkplanlWorkpion31192007wpd 3 <br /> I <br /> 1 <br />