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fi <br /> PUBLIC hEALTH SERVICES �U,N <br /> SAN JOAQUIN COUNTY <br /> r.= <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-038$ c4�;Foa`P <br /> 2091468-3420 <br /> DAVID ATWATER <br /> VAN DE POL ENTERPRISES MALM JUL <br /> P 0 BOX 1 107 <br /> STOCKTON CA 95201 <br /> Re: California Fuels Station Site Code: 1214 <br /> 2402 Pacific Avenue <br /> Stockton CA 95204 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has completed review of the June 14, 1996 "Addendum to the Work <br /> Plan dated 18 October 1995" prepared by Advanced Geo Environmental. :PHS/EHD, <br /> has prepared the following comments for your consideration. <br /> The addendum was submitted following evaluation of the soil sample results <br /> obtained from the March 1996 tank removal. The results indicated significant soil <br /> contamination associated with former tanks #1 and #2. The addendum proposed <br /> six soil borings, a minimum of three borings will be converted into monitoring <br /> wells. <br /> PHS/EHD understands that efforts to gain access to drill on the property located <br /> immediately north(2520 Pacific Ave) of former tanks #1 and #2 proved <br /> unsuccessful and that an off site well is proposed to be located in the City of <br /> Stockton right of way approximately 60 feet northeast of the former tank locations. <br /> It may or may not be necessary to install a well on the adjacent property, in the <br /> future. <br /> PHSIEHD hopes that sufficient flexibility may be retained during field activities so <br /> that the soil boring, which is proposed to be drilled immediately to the north of the <br /> former tanks, may be converted into a monitoring well. Also, there is a fine line <br /> between defining "zero" lines and defining the extent of groundwater <br /> contamination. The monitoring wells should be located sufficiently close to define <br /> the boundaries of groundwater contamination rather than so far away that the <br /> actual extent of groundwater contamination is over-estimated. <br /> Please note that sufficient soil samples should be collected to define the vertical <br /> and horizontal extent of soil contamination. PHSIEHD also suggests that analysis . <br /> include parameters such as porosity, permeability, soil moisture, and TCLP that are <br /> necessary to perform site specific environmental fate evaluations. <br /> A Division of San Joaquin County health Care Services <br />