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r ' <br /> ig I <br /> 6ETTLER - RYAN' <br /> INc. <br /> June 8, 2010 <br /> Ms. Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202-3029 <br /> Subject: Work Plan Addendum to Limited Subsurface Assessment Work Plan, <br /> City of Ripon/Madsen Sunrise Dairy,239 South Stockton Street,Ripon, California <br /> Ms. Duncan: <br /> At the request of the City of Ripon,Gettler-Ryan Inc.(GR)has prepared this Work Plan Addendum to Limited <br /> Subsurface Assessment Work Plan in response to San Joaquin County Environmental Health Department <br /> (SJCEHD)letter dated May 4,2010. The original work plan dated April 15,2010 was prepared by GR. The <br /> original scope of work includes excavation of four test pits within the former UST excavation and collection of <br /> soil samples from the test pits. <br /> Based upon SJCEHD's letter of May 4,2010,GR proposes,in addition to the test pits,the following scope of <br /> work. <br /> Task 1. Pre-field Activities <br /> GR will update the site safety plan,and will obtain the necessary permits from SJCEHD. Underground <br /> Service Alert(USA)will be notified at least 72 hours prior to excavating. <br /> Task 2. Soil Borings <br /> Four soil borings will be advanced at the locations shown on Figure 2. Gregg Drilling and Testing Inc., <br /> a California-licensed well driller (C-57 #485165), will advance the borings. A GR geologist will <br /> monitor the drilling activities and prepare a log of each well boring. Each boring will be cleared for <br /> subsurface utilities to 5 feet bgs by hand auger. GR anticipates encountering groundwater at <br /> approximately 29 feet bgs. The borings will be then advanced to approximately 30 feet bgs using a <br /> GeoProbe®or similar equipment that advances the boring equipment hydraulically without generating <br /> soil cuttings. <br /> Soil samples for description will be obtained from each boring at five-foot interval and will be submitted <br /> for chemical analysis as described in Task 3. Soil samples will be collected with a 1.5-inch diameter <br /> slalit-�sampler with clean liners. Once water is encountered,a water sample will also be collected <br /> from each of the borings and submitted for chemical analysis as described in Task 3. <br /> 6747 Sierra Court, Suite J • Dublin, CA 94568 • (925) 551-7555 • Fax (925) 551-7888 <br /> 3140 Gold Camp Drive, Suite 170 • Rancho Cordova, CA 95670 • (916) 631-1300 • Fax (916) 631-1317 <br /> 1364 N. McDowell Blvd., Suite B2 • Petaluma, CA 94954 • (707) 789-3255 • Fax (707) 789-3218 <br />