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San Joaquin County <br /> Environmental Health Department <br /> O. C DIRECTOR <br /> Donna Heran,REHS <br /> W 600 East Main Street <br /> U): s X Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> „►. Jeff Carruesco,REHS, RDI <br /> C4LfORN`P Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> Phone: (209)468-3420 Linda Turkatte, REHS <br /> Fax: (209)464-0138 <br /> October 25, 2010 <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 Limited <br /> Subsurface Investigation Report (Report), dated September 30, 2010, submitted on your <br /> behalf by Gettier-Ryan, Inc. and has the following comments. <br /> The Report documents a site investigation conducted on August 5, 2010, when four direct <br /> push geoprobe soil borings were advanced onsite to approximately 32 feet below surface <br /> grade (bsg). Soil and grab groundwater samples were collected from each of the borings. <br /> Laboratory analyses of selected samples detected low concentrations of total petroleum <br /> hydrocarbons as diesel (TPHd) in several soil samples, but the results were flagged by <br /> the lab as either"hydrocarbons are higher boiling point than typical diesel fuel" or"discrete <br /> peaks, higher boiling point hydrocarbons present, atypical for diesel fuel". The only <br /> significant soil result reported was 800 milligrams per kilogram (ppm) in sample GP-4-5', <br /> which was collected east of the former tank pit area being investigated, in soil that was <br /> noted during drilling as being non-native backfill. Four grab groundwater samples were <br /> collected; all four had reportable concentrations of TPHd; all four were flagged by the <br /> laboratory as being atypical for diesel fuel. <br /> In the Report Gettler-Ryan recommends the following: <br /> 1. Installation of three cone penetrometor test (CPT) borings to unspecified depth. <br /> 2. Installation of one hollow stem auger boring to collect a hydropunch groundwater <br /> sample in the area of boring GP-4-5'. <br /> 3. Completion of the excavation test pits proposed in a previously submitted and <br /> approved work plan. <br /> The EHD does not agree with all of this recommended scope of work. Mobilization of two <br /> different drilling apparatuses to collect additional grab samples would not seem to be cost <br /> effective. Grab samples can be subject to cross-contamination as an artifact of the <br /> equipment and methods used to collect them. The next phase of work should verify the <br /> contamination reported from the previously collected grab samples. The EHD considers <br />