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California Regional Water Quality Control Board <br /> l\j Central Valley Region <br /> v Karl E.Longley,ScD,P.E.,Chair ' <br /> Linda S.Adams Arnold <br /> Secreta rYf or 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 <br /> Phone(916)464-3291 •FAX(916)464-4645 Schwarzenegger <br /> Environmental Governor <br /> Protection http://www.waterboards.ca.gov/cmtmlvafey <br /> 20 July 2009 <br /> Mr. Stephen Gittings <br /> Deputy Director/Wastewater <br /> City of Stockton <br /> 2500 Navy Drive <br /> Stockton, CA 95206-1191 <br /> APPROVAL ON "WORK PLAN AND TIME SCHEDULE FOR ANALYSES OF <br /> BACKGROUND GROUNDWATER QUALITY," CITY OF STOCKTON, <br /> SAN JOAQUIN COUNTY <br /> Thank you for the submittal of the Work Plan and Time Schedule for Analyses of Background <br /> Groundwater Quality, dated 11 March 2009 (The Study), for City of Stockton Regional <br /> Wastewater Control Facility (The Facility). The purpose of The Study is to determine <br /> background groundwater quality for all constituents of concern at all areas of The Facility. <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff has <br /> reviewed The Study and determined that it meets the requirements of Task 1. in Provision <br /> VI.C.2.c. of Order No. R5-2008-0154 (NPDES Permit No. CA0079138). However, Central <br /> Valley Water Board staff cannot determine the appropriateness of the "present-day <br /> background' concept contained in The Study without additional information. Therefore, in <br /> addition to submitting the information summarized in section 12.0 Reporting of The Study, <br /> please provide a new contour map, which also indicates groundwater flow, based on The <br /> Study results. <br /> If you have any questions regarding this notification or other NPDES permit-related <br /> requirements, please contract me via telephone number (916) 464-4824 or email address <br /> gperreira@waterboards.ca.gov. <br /> _ Gayleen Perreira, P.E. <br /> Water Resource Control Engineer <br /> Delta/San Joaquin NPDES Permitting Unit <br /> cc: Mr. John H. Kramer, PhD, Condor Earth Technologies, Inc., Stockton <br /> California Environmental Protection Agency <br /> (j Recycled Paper <br />