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SGI TH <br /> er SOURCE GROUP INC. <br /> Wceyar) <br /> MAY ?005 <br /> May 18, 2005 Ehq R0'R-tENT HEALTH <br /> PERMIT/SERVICES <br /> Margaret Lagorio <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E. Weber Avenue, 3rd Floor <br /> Stockton, CA 95202-2708 <br /> Subject: Soil Boring Installation for Drinking Water Quality Assessment <br /> 17023 E. Milgeo Avenue, Ripon, California <br /> Dear Ms. Lagorio: <br /> The Source Group Inc. (The Source Group), at the behest of The City of Ripon, has prepared <br /> this work plan for the collection of groundwater quality data near the Rankin property residential <br /> supply well located at 17023 E. Milgeo Avenue in Ripon, California (see Figure 1). The goal of <br /> the assessment is to ascertain the potential effects of pumping City of Ripon Well 14 on water <br /> quality in neighboring residential water supply wells. The purpose of the data collection and <br /> assessment is to evaluate new information and a point of uncertainty that was raised at a May <br /> 5, 2005 meeting between the City, neighboring well owners, and the State Water Board. <br /> SCOPE OF WORK <br /> Groundwater quality data will be collected from near the Rankin residential water supply well <br /> and between the Rankin and Azevedo residential water supply wells. The work included under <br /> each task is described in further detail below. <br /> Data will be collected from two borings (SB-01 and SB-02) located near the Rankin residential <br /> water supply well (see Figure 2) in order to evaluate changes in nitrate concentrations with <br /> distance from the well. The preliminary locations are: <br /> • Approximately 20 feet away from the Rankin residential water well (boring SB-01). <br /> • Approximately 250 feet away from the Rankin residential water well along the dirt road <br /> between the Rankin and Azevedo properties such that the boring is also located <br /> approximately 250 feet away from the Azevedo residential water well (boring SB-02). <br /> A hollow-stem auger drill rig will be used in combination with Hydropunch and split-spoon <br /> sampling equipment. Groundwater and soil samples will be taken from six depths in each <br /> boring (approximately 100, 120, 140, 160, 180 and 200 feet below ground surface). These <br /> depths span the gravel packed interval of the Rankin residential water supply well (110 to 185 <br /> 3451-C Vincent Road Telephone: (925) 944-2856 XJ— <br /> Pleasant <br /> TPleasant Hill, California 94523 Facsimile: (925) 944-2859 <br /> Well Permit Letter <br />