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PUBLIC HEALTH SECES <br /> POUIN <br /> SAN JOAQUIN COUNTY ° ` <br /> ENVIRONMENTAL HEALTH DIVISION < <br /> r <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Office ••. <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 9 %Fb` P.• <br /> JEFF CRANBERRY 209/468-3420 AUG 15 1996 <br /> SHELL OIL <br /> PO BOX 5278 <br /> CONCORD CA 94520 <br /> Re: Shell Service Station Site Code: 1223 <br /> 6131 Pacific Ave <br /> Stockton CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of the "Quarterly Monitoring Report - Second Quarter 1996" dated July 30, 1996 <br /> and prepared by Enviros. PHS/EHD has the following comments for your consideration. <br /> As PHS/EHD indicated in correspondence dated May 9, 1996, that the three existing monitoring <br /> wells were constructed similarly with screened intervals between 45' - 65' below ground surface <br /> (bgs) and that it was anticipated that the wells were screened below first water. The results of the <br /> May 1996 sampling event indicated that screens are below first water in all monitoring wells. <br /> Vapor extraction well, VE2, is screened between 25' and 45' bgs; therefore, representative <br /> groundwater samples may be collected from it. Please include monitoring and sampling of VE2 <br /> during the third quarter monitoring event. An evaluation of the monitoring capabilities of the site <br /> must be included in the third quarterly report. <br /> PHS/EHD further requested submittal of the Blaine Tech field notes from the February 28, 1996 <br /> sampling. PHS/EHD has not received these notes nor the field notes from the May 16, 1996 <br /> sampling event. As you are aware, PHS/EHD makes periodic inspections of sampling events, but <br /> cannot provide inspections of each sampling event. Therefore, PHS/EHD reviews the sample field <br /> data sheets that are included with the quarterly reports. PHS/EHD also requests that the depth to <br /> water measurement be collected prior to sampling, following the completion of purging activities, to <br /> verify that the wells have sufficiently recharged. Field notes must be submitted with each quarterly <br /> report. Please submit field notes for the February 28 and May 16, 1996 sampling events. <br /> PHS/EHD had a number of comments included in the May 9, 1996 correspondence regarding the <br /> work plan dated May 1, 1996. Please submit an addendum addressing PHS/EHD's comments. <br /> If you have any questions or comments, please do not hesitate to contact me at (209) 468-0337. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> 4 3 <br /> Mary Meays, Senior REHS Margaret agorio, REH <br /> Site Mitigation Unit Lead Senior <br /> MM/6131 PAC <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Diane Lundquist, Enviros <br /> A Division of San Joaquin County Health Care Services <br />