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ENVIRONMENTAL HEALTH DEPARTMENT <br /> PCU`" 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,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 <br /> Douglas W.Wilson,R.E.H.S. <br /> • c.. 'P • Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> �r F oR Laurie A.Cotulla,R.E.H.S. <br /> Fax: (209) 464-0138Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> KAREN PETRYNA NOV 12 2003 <br /> EQUILON ENTERPRISES LLC <br /> P O BOX 7869 <br /> BURBANK CA 91510-7869 <br /> RE: SHELL-BRANDED SERVICE STATION SITE CODE 506313 <br /> 1071 NORTH MAIN STREET <br /> MANTECA, CALIFORNIA <br /> San Joaquin County Environmental Health Department(EHD)has reviewed current site data <br /> prepared by Cambria Environmental Technology,Inc. (Cambria) on your behalf and believes that <br /> conditions may warrant site closure consideration. EHD requests that you submit a closure summary <br /> report. This report should include required data listed in Table 1 from Appendix B of the Tri- <br /> Regional Guidelines. While all items in Appendix B should be addressed,EHD is particularly <br /> interested in the following to facilitate closure consideration: <br /> • Cross-sections showing correlated soil lithologies,contaminant concentrations,lateral and <br /> vertical extents of impacted soil and groundwater, and contaminant migration pathways. <br /> • Tables of current and historical analytical soil and groundwater data. I <br /> • Calculations showing estimates of the present dissolved and adsorbed contaminant masses of <br /> methyl tertiary-butyl ether and total petroleum hydrocarbon as gasoline. <br /> • A modeled estimate of the future impact to groundwater from adsorbed contaminants. <br /> • An estimate of the projected maximum plume extent resulting from the modeled additional <br /> impact of groundwater, and <br /> • A demonstration that the drop in groundwater concentrations is not merely the result of <br /> groundwater elevations being approximately ten feet lower than in the year 1998. <br /> I <br /> If you have any questions regarding this letter please contact Vicki McCartney,REHS,at <br /> (209)468-3456. <br /> Donna Heran,REHS,Director <br /> Environmental Health Department <br /> Vicki McCartney,RENS Nuel C.Henderson,Jr.,RG i <br /> Unit IV-Site Mitigation <br /> Unit IV-Site Mitigation <br /> cc: Joe W.Neely-Cambria <br /> James L.L.Barton-CVRWQCB <br /> i <br /> I <br /> i <br /> _ I <br />