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San Joaquin County <br /> oPpu`" Environmental Health Department DIRECTOR <br /> F' Donna Heran, REHS <br /> 600 East Main Street <br /> �• � Stockton, California95202-3029 PROGRAM COORDINATORS <br /> �: �{ Robert McClellon,REHS <br /> ,teff Carruesco,REHS, RDI <br /> ' Kasey Foley,REHS <br /> .. �P Website: www.sjgov.org/ehd Linda Turkatte,REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> May 3, 2011 <br /> City of Ripon <br /> c/o James Pease Robert & Carol Madsen Trust <br /> 259 North Wilma Avenue 20020 North Ripon Road <br /> Ripon, CA 95366 Ripon, CA 95366 <br /> Subject: City of Ripon/Madsen Sunrise Dairy <br /> 239 South Stockton Street <br /> Ripon, CA 95366 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Soil <br /> Boring & Monitoring Well Installation Report (Report), dated April 5, 2011, submitted on <br /> your behalf by Gettler-Ryan, Inc. and has the following comments. <br /> The Report documents the installation of one soil boring, B-1, and one groundwater <br /> monitoring well, MW-1. Boring B-1 was an angle boring installed by hollow stem auger to <br /> obtain soil samples from beneath the west end of the former underground storage tank, <br /> under the location of tank pit sample TW-13 which was impacted with total petroleum <br /> hydrocarbons (TPH) as diesel. MW-1 was installed downgradient of the TW-13 area. <br /> Boring B-1 was installed to an approximate vertical depth of 30 feet below surface grade <br /> (bsg); well MW-1 was installed to 39 feet bsg, and has 15 feet of screen. <br /> Soil samples for laboratory analysis were collected from both B-1 and MW-1; all results <br /> were reported non-detect for TPH as gasoline, diesel and motor oil. Groundwater samples <br /> have been collected from MW-1 twice; results were reported non-detect for TPH diesel <br /> and TPH motor oil. TPH as gasoline was reported at concentrations of 67 and 55 <br /> micrograms per liter (pg/1), but the results were flagged as being primarily compounds not <br /> typical to gas. Review of the chromatograms indicate the peaks represent trichloroethene <br /> which is found regionally in Ripon shallow groundwater, part of a plume from the former <br /> Nestle facility, the investigation of which is overseen by the Regional Water Quality <br /> Control Board (RWQCB). <br /> In the Report Gettler-Ryan recommends the site be considered for case closure. The EHD <br /> agrees with this recommendation. Please proceed with submittal of a comprehensive site <br /> closure report that includes the following: <br /> 1. Calculation, or best estimate, of contaminant mass remaining in the soil. <br /> 2. A discussion of the potential vapor intrusion threat from any remaining soil <br /> contamination. <br /> 3. Detailed demonstration of how the groundwater flow direction was determined <br /> for siting the location of MW-1, as opposed to the ENE direction determined at the <br /> site located at 106 S. Second Street, Ripon. <br /> 4. All other requirements of the Tri-Regional Guidelines Appendix A. <br />