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C A M B R I A <br /> C <br /> � 1 lv� LJ <br /> I^��}, <br /> �i <br /> �� <br /> MAY d 3 2002 April 30, 2002 <br /> Mr Jeffrey Wong <br /> San Joaquin County Public Health Services El1�Vi a_1LTH <br /> Environmental Health Division uLZS <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re First Quarter 2002 Groundwater Monitoring Report and Response Letter <br /> Former Shell Service Station/Econo Gas <br /> 880 Victor Road <br /> Lodi, California <br /> SAP Code 135446 <br /> Incident No 98995526 <br /> SJCPHS/EHD Site Code 1746 <br /> Dear Mr Wong <br /> Cambria Environmental Technology, Inc (Cambria) prepared this report on behalf of Shell Oil <br /> Products US in accordance with quarterly reporting guidelines issued by the Central Valley <br /> Regional Water Quality Control Board and San Joaquin County Public Health Services, <br /> Environmental Health Division (SJCPHS/EHD) <br /> FIRST QUARTER 2002 ACTIVITIES <br /> Blaine Tech Services, Inc (Blaine) of San Jose, California gauged and sampled all site wells and <br /> prepared a summary table of field gauging data and a summary table of groundwater analytical <br /> data (Appendix A) Cambria compiled the groundwater flow direction data (Table 1) and <br /> oxygenate and lead scavenger data(Table 2), prepared a site vicinity/well survey map (Figure 1), <br /> and prepared a groundwater contour/chemical concentration map (Figure 2) Blaine's report, <br /> presenting the laboratory report, is included as Appendix A <br /> Cambria received SJCPHS/EHD's March 22, 2002 letter This letter expresses SJCPHS/EHD's <br /> concern about the varying groundwater flow directions observed at the site As Cambria has <br /> previously noted, the groundwater gradient beneath the site is consistently virtually flat Further, <br /> Oakland c A it is not unusual for groundwater flow directions to <br /> San Ramon CA gT appear to vary when gradients are flat <br /> Son o m a CA SJCPHS/EHD recommends that Cambria recalculate historical groundwater flow directions <br /> Cambria reviewed the historical maps, and they are correct SJCPHS/EHD recommends that the <br /> Cambria rose diagram presented on Figure 2 provide specific gauging date information The purpose of a <br /> Environmental <br /> Technology,Inc rose diagram is to depict historical groundwater flow directions graphically over the history of <br /> 09monitoring, they are not meant to correlate specific flow directions with dates In order to <br /> erkms Street <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />