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i-,`NTAL HEALTH <br /> 83 WEST MARCH LANE <br /> SUITE 12 <br /> sM PHONESTOCKTON9,CA <br /> 95207(2 ) 76 1635 P? A U r, 38 PF1 2: 00 <br /> AtWA6EliS DESO�TMIIS <br /> September 3, 1993 <br /> Ms. Donna Heran, REHS <br /> Program Manager <br /> Environmental Health Division (EHD) <br /> San Joaquin County Public Health Services <br /> 445 North San Joaquin Street <br /> Stockton, CA 95202 W.O. No. 03733-006-001 <br /> SUBJECT: San Joaquin County Human Services <br /> Site Code 1257 <br /> Response to letter from EHD to Richard Callistro, San Joaquin County <br /> Capital Projects, dated August 18, 1993, regarding review of Quarterly <br /> Groundwater Monitoring Report, Second Quarter, 1993. <br /> Dear Ms. Heran: <br /> On behalf of the San Joaquin County Capital Projects Division, this letter responds to the <br /> following issues raised in the above-referenced EHD letter: 1) laboratory detection limits for <br /> analysis of BTEX, 2) contaminants detected below the laboratory detection limits and 3) the <br /> continuation of quarterly analyses for TPH-D and EDB. Each issue is discussed below along <br /> with other project procedures of current importance to the project performance. <br /> Analytical Detection Limits <br /> WESTON is well aware of the recommended laboratory detection limits defined in the Leaking <br /> Underground Fuel Tank (LUFT) Manual and the Tri-Regional Board Staff Recommendations. <br /> In response to previous discussion with regulatory agency personnel regarding this issue, <br /> WESTON contacted three individuals associated with LUFT regulations and protocols to review <br /> the WESTON laboratory practices relative to current regulatory requirements. The persons <br /> contacted were Kim Ward, with the Underground Storage Tank Section of the State Water <br /> Resources Control Board, listed in the LUFT Manual as the point of contact regarding analytical <br /> procedures, Donald Dalke, Division Chief of the San Francisco Regional Water Quality Control <br /> Board (RWQCB) and Gordon Boggs, Program Manager for the Central Valley RWQCB. <br /> Ms. Ward indicated that a 1.0 µg/L (parts per billion, ppb) reporting limit for BTEX in liquids <br /> would be acceptable as far as the LUFT Manual was concerned but added that each RWQCB <br /> has the final say as to requirements pertaining to each region. Mr. Dalke provided his region's <br /> view on reporting limits and pointed out that the Tri-Regional document is a recommendation <br /> and not a requirement. <br /> SIl( SWP LNMP <br />