Laserfiche WebLink
San Joaquin County DIRECTOR <br /> Donna Heran, RENS <br /> Environmental Health Department <br /> c0 ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla. REHS <br /> �U) � - - <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> • — Carl Borgman, REHS <br /> �;.. Mike Huggins, RENS, RDI <br /> q��FO,R�� Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 Jeff Carruesco. REHS, RDI <br /> Kasey Foley, REHS <br /> June 13, 2008 <br /> Mr. Dung Thanh and Ms. Nhuan Le <br /> 2224 Manthey Road <br /> Stockton, California 95206 <br /> Subject: California Stop <br /> 2224 Manthey Road <br /> Stockton, California 95206 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Quarterly <br /> Monitoring Report — First Quarter 2008 dated February 29, 2008, prepared by Advanced <br /> GeoEnvironmental, Inc. (AGE) on your behalf for the above-referenced site. <br /> Concentrations of methyl tertiary-butyl ether (MTBE) have increased significantly in <br /> monitoring wells MW-1, MW-3, MW-6, MW-7, and MW-8 compared to MTBE results <br /> from sampling events in 2007. AGE has recommended that groundwater batch removal be <br /> implemented immediately as an interim groundwater remediation method. The EHD <br /> concurs with AGE's recommendation. Submit a work plan to the EHD by July 30, 2008, <br /> that will address the removal by batch extraction of groundwater contaminated with <br /> MTBE. <br /> By letter dated March 19, 2007, the EHD approved the performance of two proposed eight- <br /> hour pumping tests. It has been over a year and the EHD has not received the results from <br /> the groundwater extraction tests. The EHD directs that the aquifer pump tests be <br /> performed within sixty days of the date of this letter and the report of findings from the <br /> pump test be submitted to the EHD within sixty days of completing the tests. Include in <br /> the report a comparison between batch extraction versus groundwater extraction for <br /> remediation of contaminants of concern. <br /> The vertical and lateral extent of soil contamination appears to be defined at your site. This <br /> decision is based on non-detect analytical results from one soil sample collected at fifty feet <br /> below surface grade (bsg) from cone penetration test (CPT) boring CPT 1, located near the <br /> source area, and soil samples collected at seventy-five feet bsg from monitoring well <br /> MW-4, located down gradient from the source area. However, the vertical and lateral <br />