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ENVIRONMENTAL HEALTH DEPARTMENT <br /> ' A°"'" SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K Heran,R E H S <br /> - -' 304 East Weber Avenue, Third Floor Carl Borgman,R E H s <br /> Director Mike Huggins,RE H S ,R D i <br /> ' At Olscn,R F H S Stockton, California 95202-2708 Douglas W Wilson,R E H S <br /> cqh ogrum Manage, Telephone (209) 468-3420 Margaret Lagono,R E H S <br /> IF 09T4X Laurie A Cotutla,R E H SRobert McClellon,R E H S <br /> Program Manager FaX (209) 464-0138 Mark Barcellos,R E H S <br /> CRAIG OGATA ` <br /> r 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 Invests a n DATED March 12- 2004 <br /> PREPARED BY Ramage Environmental <br /> ' APPROVED X <br /> lieADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN [Health& Safety Code <br /> (H&S) Section 25299 37(c)(3)] <br /> I 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 /> 2 Soil samples will be collected at five-foot intervals to determine the hydrogeologic and <br /> iithologic characterizations,and discreet groundwater samples will be colleted 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 /> benzene total xylenes (BTEX)by EPA SW-846 <br /> method 8015B,benzene,toluene,ethylle <br /> Y <br /> method 8021, 1,2-dschloroethane(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 recovenes 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(gg/L) <br />