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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> er 4. 2 Donna K. Heran, R.E.H.S. Carl Borgman, R.E.H.S. <br /> 304 East Weber Avenue, Third Floor <br /> Director Mike Huggins, R.E.H.S , RDI <br /> Al Olsen, R.E.H.S' Stockton, California 95202-2708 <br /> Douglas W. Wilson, R.E.H.S, <br /> cq a <br /> ProgramManager Telephone: (209) 468-3420 Margaret Lagorio, R.E.H.S. <br /> tl F 6R Laurie A. Cotulla, R,E.H,S, Robert McClellon, R.E.H.S. <br /> Program Manger Fax: (209) 464-0138 Mark Barcellos, R.E.H.S. <br /> CRAIG OGATA <br /> DIRECTOR OF FACILITIES MANAGEMENT <br /> SAN JOAQUIN COUNTY PUBLIC WORKS <br /> 1722 EAST SCOTTS AVENUE <br /> STOCKTON CA 95205 - 6240 <br /> RE: San Joaquin County Garage <br /> 130 North Hunter Street <br /> Stockton, CA 95202 <br /> WORKPLAN: Work Plan Additional Site Investigation DATED: Match 12, 200 <br /> PREPARED BY: Ramie Environmental <br /> APPROVED X <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN [Health & Safety Code <br /> (H&S) Section 25299.37(c)(3)]: <br /> 1 . Advancement of three direct-push soil borings to groundwater at approximately 25 to 30 <br /> feet below ground surface (bgs) to further define the lateral extent of impacted soil and <br /> groundwater inside the parking garage. Two borings will be located adjacent to the <br /> south wall, one in the southwest corner of the garage, and one down gradient of the <br /> identified petroleum hydrocarbon plume. A third boring will be advanced approximately <br /> 20 feet from the east wall of the garage and directly opposite the former dispenser island. <br /> 24 Soil samples will be collected at five-foot intervals to determine the hydrogeologic and <br /> lithologic characterizations, and discreet groundwater samples will be collected at total <br /> depth from each boring. <br /> 3, Groundwater samples will be analyzed for: total petroleum hydrocarbons as gasoline <br /> (TPH-G), by U. S. Environmental Protection Agency (EPA) SW-846 method 8015B; <br /> total extractable petroleum hydrocarbons as kerosene (TEPH-Kerosene) by EPA SW-846 <br /> method 8015B; benzene, toluene, ethyl benzene, total xylenes (BTEX) by EPA SW-846 <br /> method 8021 ; 1 ,2-dichloroethane (1 ,2-DCA), 1 ,2-dibromoethane (EDB), methyl tertiary- <br /> butyl ether (MTBE), diisopropyl ether (DIPE), tertiary-amyl methyl ether (TAME), ethyl <br /> tertiary-butyl ether (ETBE), tertiary-butyl alcohol (TBA), methanol, and ethanol by EPA <br /> SW-846 method 8260B. Please report all surrogate recoveries for methods 8015B, 8021 , <br /> and 8260B, and include associated method blank, laboratory control sample, and matrix <br /> spike results, as well as the quality control limits. Please ensure the reporting limit for <br /> 1 ,2-DCA is at least 0.5 micrograms per liter (µg/L) <br />