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Soil Suitability&Nitrate Loading Study Page 5 Proposed M2 Winery,2900 Peltier Rd,Acampo CA Project No. 670.1A May 28,2013 4.0 GROUNDWATER RESOURCES �Jo r 4.1 Depth and Flow of Groundwater According to the maps contained in the San Joaquin County Flood Control and Water Conservation District report entitled " ring2003 Graundwater&porf', (Appendix B) the depth to first groundwater in this area lies at a depth of about 25 feet below ground level (+10 Ft above MSL) and flows toward the northwest. Seasonal variation in the depth to \ water in the area is typically in the range of several feet. The direction of flow may fluctuate, but will generally return in a northeasterly direction. 4.2 Known and Potential Groundwater Contamination There are many possible sources of groundwater contamination including leaking storage tanks, surface releases of hazardous materials, over-use of agricultural chemicals, leakage from dairy lagoons, and septic sewage seepage. A detailed investigation of potential groundwater contamination was beyond the scope of this investigation however, the State Water Board's "GeoTracker" website http://geotracker.swrcb.ca.gov/ was searched to help identify possible sources of nearby groundwater contamination. No such sites were C� �) identified within one mile of the site. No nearby dairy lagoons or other common potential sources of contamination were noted in the air photo either. Nitrate from waste disposal must be considered as possible sources of groundwater "J C3 ,� contamination at this site. In this case, no up-gradient residential septic systems within '/4 mile appear to be present. 4.3 Water Well Sampling and Analysis One water well is present on-site. As mentioned above, records pertaining to the water well C 3� were searched at the EHD, but the only record is a 1992 permit for replacing the pump was found. The well is located near the road frontage on the east side of the parcel as shown on the site map. Geo-Phase Environmental Inc. sampled the well on April 15, 2013. The well sample was collected from a flow line just downstream of the pump. The pump was activated and water was allowed to run for several minutes prior to the sample collection to help assure that the sample was fresh and representative of groundwater conditions. The water was collected ( directly into a I-liter amber glass jar and 40-m1 VOA phials. The sample was immediately sealed, labeled and place in a cooler chilled to 4 degrees C. The sample was then transported to Argon Laboratories, a State certified analytical laboratory in Ceres, CA under chain-of- custody protocol. The chain-of-custody and laboratory data sheets are attached as Appendix D. The sample was tested for the presence of the agricultural fumigant 1,2-dibromo-3- � w� chloropropane (DBCP), and for total nitrate. The water well sample did not contain detectable concentrations of DBCP. The total nitrate concentration was 0.42 mg/L(parts per million)as compared to the maximum allowable drinking water concentration of 45 mg/L. 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto,CA 95356 Fax: (209)569-0295