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04 January 2013 <br />AGE -NC Project No. 12-2179 <br />Page 3 of 7 <br />square -mile San Joaquin Valley Groundwater Basin, which is drained primarily by the San <br />Joaquin River (Basin 5-22). Escalon lies within the Modesto Groundwater Sub -basin, which <br />is drained primarily by the Stanislaus River, which drains into the San Joaquin River. <br />The closest potential receptor is a domestic well located across Santa Fe Road, at the <br />southwest end of property at the Ranch Market; the receptor is known to be impacted <br />petroleum range hydrocarbons (based the site at Ranch Market). Due to the significant <br />distance between the subject site and the described domestic well, minor constituent <br />impact to soil and lack of impact to groundwater, there does not appear to be a significant <br />concern regarding the location of well. Other local (domestic and agricultural) wells are <br />present south of the site. No other receptors noted in the survey appeared to raise a <br />significant concern or threat to human health. <br />1.2 SOIL PROFILE <br />In general the soil stratigraphy beneath the site consists of interbedded units of <br />fine-grained soil (i.e. silt, silty sand,clays) and coarse-grained soil (i.e. sand, gravels). The <br />silty sand layer appears underlain by soil composed of silt with sand extending to depths <br />of approximately 10 to 15 feet bsg. The layer of silt is then underlain by coarse -grain soil <br />composed of sand, sand with silt and silty sand, which extended to a depth of <br />approximately 25 feet bsg. <br />1.3 GROUNDWATER HYDROLOGY <br />Based on the information obtained from local assessment activities, depth to ground water <br />in the vicinity of the site is approximately 30-35 feet bsg. Regional ground water flow <br />direction is generally south to southwest. However, ground water depth and flow direction <br />can vary locally and seasonally. <br />1.4 PRE -FIELD WORK ACTIVITIES <br />A health and safety plan will be prepared in accordance with Occupational Safety and <br />Health Guidance Manual for Hazardous Waste Site Activities (National Institute for <br />Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental <br />Protection Agency, 1985). Prior to mobilization, the area of excavation and cover areas <br />will be clearly marked and an utility clearance obtained through Underground Service Alert. <br />Permits required from other agencies will be procured prior to implementing the proposed <br />corrective action. <br />Advanced GeoEnvironmental, Inc. <br />