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Larry's Auto Page 2 <br /> 308 North Grant Street July 2, 2010 <br /> Stockton, California 95202 <br /> treat), AGE recommended IAS/SVE for remediating both soil and groundwater at the <br /> northwest corner of the property near former underground storage tank (UST) identified as <br /> Tank A. <br /> In the Report, AGE differentiates between the process of injecting clean air at the bottom of a <br /> groundwater well (referred to as in-well aeration or in-well air stripping), and injecting clean air <br /> directly into an aquifer (referred to as IAS), and AGE elaborates on the pros and cons of IAS. <br /> AGE concludes that air sparging by in-well aeration coupled with SVE should be employed for <br /> soil and groundwater remediation in the northern area where the former Tank A was removed. <br /> AGE also recommends that sparge points or in-well aeration be used to remediate <br /> groundwater in the area of former USTs identified as Tanks B and C where there exists high <br /> concentrations of total petroleum hydrocarbons as diesel. <br /> The EHD approves AGE's recommendations and directs that a remedial action work plan be <br /> submitted to the EHD by September 8, 2010. As discussed during a telephone conversation <br /> with AGE on 28 June 2010, the EHD would like additional information concerning the in-well <br /> air sparging design since it appears to the EHD that air will be injected above the groundwater <br /> table as shown in Figure 3 of the Report. Also the EHD is extending the date for submitting a <br /> work plan for the collection .of soil gas samples to evaluate the potential threat from vapor <br /> intrusion from 01 June 2010, to 30 July 2010. <br /> Please redevelop MW-4 prior to the next sampling event. Data submitted from the 31 March <br /> 2010 sampling event indicate that this well has about five feet of silt at total depth that must be <br /> removed. <br /> If you have any questions, please contact Vicki McCartney at (209) 468-9852 or by e-mail at <br /> vmccartney(a)sicehd.com. <br /> Sincerely, <br /> � �' <br /> Victoria L. McCartney, REHS 0 Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. William R. Little, PG, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />