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I <br /> McBillin Real Estate Investment Property Page 2 <br /> 2154 South EI Dorado Street June 12, 2013 <br /> Stockton, California 95206 <br /> • Collection of groundwater samples quarterly for a minimum of one year, if a monitoring <br /> well is installed; <br /> • Submittal of a report of findings following the borehole/monitoring well installation and <br /> quarterly groundwater monitoring reports if the monitoring well is installed; and <br /> • Notification of pending fieldwork and grout inspections at least 48 hours prior to <br /> conducting the fieldwork. <br /> The EHD approves AGE's proposal to advance one deep boring to define the vertical extent of <br /> the adsorbed and dissolved petroleum hydrocarbon plume and possibly convert the borehole <br /> into a monitoring well with the following conditions: <br /> • The EHD recommends relocating borehole B5 south of B2 and adjacent to GW-7; high <br /> concentrations of contaminants of concern were detected in soil samples collected from <br /> B2 between 20 and 60 feet bsg , and the highest concentrations of petroleum <br /> hydrocarbon contamination were detected in grab groundwater samples collected from <br /> GW-7 in 2008, indicating that this area may be significantly more impacted when <br /> compared to grab groundwater samples collected from GW-6; <br /> • Notify the EHD at least two weeks prior to the scheduled fieldwork; <br /> • Install a deep monitoring well if a course-grained unit is identified during the <br /> advancement of B5, and set the screen interval of the proposed deep well in as shallow <br /> an area as possible to provide as close a vertical delineation to the source area as <br /> possible ; and <br /> • Analyze groundwater collected quarterly from the proposed well for TPH-g , BTEX, DIPE, <br /> ETRE , MTBE, TAME, TBA, EDB and 1 , 2-DCA. <br /> Please submit a boring permit application, Master File Record form and permit/inspection fees <br /> of $500. 00 to the EHD and complete the fieldwork by 13 September 2013. If you have any <br /> questions regarding this letter, please contact Vicki McCartney at (209) 468-9852 , or by email at <br /> vmccartnev(cDsicehd. com <br /> Sincerely, <br /> Victoria L. McCartney, REHS If Nuel C. Henderson, Jr. , PG <br /> Senior Registered Environmental Heath Department Engineering Geologist <br /> c: Mr. James L.L. Barton, PG , California Regional Water Quality Control Board Central Valley <br /> Region , 11020 Sun Center Drive, Suite 200, Rancho Cordova , California 95670 <br /> Mr. Timothy J . Cuellar, Advanced GeoEnvironmental , Inc. , 837 Shaw Road, Stockton, <br /> California 95215 <br />