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KLEINFELDER WORKPLAN LIMITED SOIL AND GROUNDWATER SAMPLING AND ANALYSIS FORMER SUPREMA SPECIALTIES WEST WASTEWATER POND NO. 7 MANTECA, CALIFORNIA INTRODUCTION This workplan was developed after correspondence and meeting with Mr. Don Wilden of Pulte Homes and Ms. Ella Foley-Gannon of Shepard, Mullin, Richter and Hampton, LLC and is a preliminary understanding of Pulte's desires and needs. The Proposed Sample Location Map is included as Plate 1, and Typical Kieinfelder Field Protocols in Appendix A. BACKGROUND The former Suprema Specialties West, Inc. cheese processing wastewater Pond No. 7 was utilized for the discharge of non-hazardous wastewater generated for the processing of cheese products. The facility was regulated by the Regional Water Quality Control Board (RWQCB) in accordance with Waste Discharge Requirements (WDR), which included groundwater monitoring around the pond. The facility went out of business in 2001, and the WDR was rescinded by the RWQCB. No further groundwater monitoring was conducted and the facility operations were unregulated since that tirne. The former wastewater pond is an unlined above ground pond with bermed side-walls. The bottom of the pond is estimated to be approximately 10-feet below the final grade of the site. The area around the former pond has been typically agricultural and ranching. Dairy facilities were also common in the area. The facility was regulated by the RWQCB in accordance with Waste Discharge Requirements (WDR), which included groundwater monitoring around the pond. The discharge quality was characterized as having TDS concentrations of 2,234 mg/L and EC concentrations of 3,810 umhos/cm. At the time the facility went out of business the effluent concentrations of TDS, EC, and nitrate reportedly could not be reduced to acceptable levels, even though treatment plant upgrades had been implemented. According to the information gathered from the RWQCB during a file review; the former wastewater pond system was utilized by Suprema Specialties West, Inc. for the discharge of' non-hazardous wastewater generated for the processing of cheese products. Wastewater flows averaged 350,000 gallons per day. Wastewater was processed through up to six unlined wastewater ponds (Ponds 1-6) at the facility(on the west side of Airport Road) prior to being pumped over to the final pond (Pond 7) located on the east side of Airport Road. The wastewater was treated in Ponds 1-6 by neutralizing the pH, concentration equalization in an equalization pond, and biological treatment in two high rate trickling filters (bio-towers) with a re-circulation basin prior to discharge to Pond No. 7. After reaching Pond 7 the treated wastewater was mixed with fresh water and used to irrigate the crops south of the pond. Pond 7 had an aerator 59830.H02/STO6R1055/JDZ:Iv Page 1 of 5 ©2006 Kleinfelder, Inc. October 16,2006