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PUBLIC FTEALTH SERVI(fES <br /> SAN JOAQUIN COUNTY r `� <br /> ENVIRONMENTAL HEALTH DIVISION `� { <br /> Kaaren Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 L'Fo'R4 <br /> 209/468-3420 C d <br /> IF <br /> Kyle Christie <br /> ARCO Products Company JUL 2 3 1997 <br /> P O Box 612530 <br /> San Jose CA 95008 <br /> RE: ARCO Service Station 2186 Site Code: 1035 <br /> 3212 N California Street <br /> Stockton CA 95204 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the March 12, 1997 Quarterly Groundwater Monitoring Report prepared by EMCON and <br /> Associates for the above referenced site. <br /> In the discussion section of the report EMCON states that results of this monitoring event <br /> indicated that levels of dissolved gasoline hydrocarbons are consistent with levels detected during <br /> previous sampling events. PHSIEHD concurs with this statement. A more detailed interpretation of <br /> submitted data indicates that MW-2 and MW-3 have been non detect since installation. The two <br /> groundwater samples obtained from VW-3 have produced consistent analytical results of TPH-g in <br /> the range of 280-290 ppb. The well consistently producing the most concentrated analytical <br /> results is MW-1. <br /> Analytical benzene concentrations in MW-1 range from 20,000 ppb to 730 ppb. Analytical results <br /> seem to be producing a random pattern, rather then any discernible trend, towards becoming <br /> either more concentrated or less concentrated. MW-1 also is the downgradient well for the site <br /> (gradient is trending north and east) and is approximately 45 feet from the eastern property <br /> boundary. An additional monitoring well at the eastern property boundary, downgradient of MW-1, <br /> may provide data from which a lateral degradation rate and an approximate plume length may be <br /> estimated. <br /> PHSIEHD requires additional assessment to determine the lateral and vertical extent of the <br /> petroleum hydrocarbon groundwater plume which appears to originate at this site. In order to <br /> remain in compliance with Article 11 Regulations, PHSIEHD recommends that you or your <br /> consultant submit a workplan which will describe a method to assess the extent of this plume by <br /> September 22, 1997. <br /> For additional information please contact Steven Sasson, Senior R.E.H.S., at(209)468-3459 <br /> Donna Heran, REHS, Director <br /> yirnmeSassd�i, ,RrEHS MarganiO Lagorio, REHSS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region - Elizabeth Thayer <br /> c: Katherine Bevanda <br /> A Division of San Joaquin County Health Care Services <br />