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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> 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.,R.D.I. <br /> =` ` '• , <br /> At Olsen, Stockton, California 95202-2708 <br /> _ Douglas W.Wilson,R.E.H.S. <br /> • �q.J.�..�P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Robert McCtellon,R.E.H.S. <br /> Program Manager Fax:_(209) 464-0138. Mark Barcellos,R.E.H.S. - <br /> MABEL KEIR <br /> 1103 GRANTLINE CT <br /> MODESTO CA 95330 <br /> RE: Lopez Properties SITE CODE: 0001525 <br /> 1601 Turnpike <br /> Stockton,CA 95206 <br /> WORKPLAN: Revised Work Plan Monitoring Well Installation <br /> DATED: August 26,2004 <br /> PREPARED BY: Kleinfelder, Inc. <br /> APPROVED X <br /> DISAPPROVED ❑ <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN [Health&Safety Code <br /> (H&S) Section 25296.10(c)(3)]: <br /> 1. Installation of three monitoring well's to approximately 35 feet below surface grade(bsg)to <br /> investigate the vertical and lateral extent of residual soil contamination,and for collection of <br /> quarterly groundwater samples to investigate groundwater gradient and contamination. The <br /> three monitoring wells will be advanced approximately 25 feet east,30 feet southeast,and 40 <br /> feet west of the former underground storage tank(UST)location. Soil samples will be <br /> collected at five-foot intervals for lithological classification; and based on field conditions <br /> and observations, approximately three soil samples per boring will be analyzed for chemicals <br /> of concern. <br /> 2. Quarterly groundwater samples and selected soil samples from the well installations will <br /> be analyzed for: <br /> • Total petroleum hydrocarbons as gasoline(TPH-G)by United States Environmental <br /> Protection Agency(EPA) SW-846 Method 8015B; <br /> • Benzene,toluene,ethyl benzene, and total xylenes(BTEX)by EPA SW-846 Method <br /> 8021B; <br /> • Methyl tertiary-butyl ether(MTBE),tertiary butyl alcohol(TBA), di-isopropyl ether <br /> (DIPE),ethyl tertiary-butyl ether(ETBE),tertiary amyl methyl ether(TAME), <br /> ethylene dibromide(EDB),and 1,2-dichloroethane (1,2-DCA)by EPA SW-846 <br /> Method 8260B. <br />