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Final Remediation Plan Page 3 Ranch Market 23564 South Santa Fe Road Riverbank CA February 28 2001 . to the Pantoja Property Due to presence of nitrates in the water sample collected from DW-1, the water line running from DW-1 to the Pantoja Property was disconnected and replaced with a water supply tank in November 16, 2000 The water tank supplied the Pantoja Property with water from November 16, 2000 until the replacement domestic well, DW-2R, was installed and brought into service on January 18, 2001 The existing domestic water well, DW-2, was destroyed by removing the upper five feet of casing, ripping the steel casing from the bottom of the well to five feet below grade surface, and pressure grouting the well with neat cement 2.4.2 Domestic Well Replacement From December 20th to the 28th, 2000, Bradley Drilling installed the replacement well DW- 2R on the Pantoja Property The well was completed with 6 518 inch internal diameter steel well casing from ground surface to 208 feet bgs and forty feet of 0 060-inch slot screen was set from 208 to and 248 feet bgs On January 18, 2001, with approval from SJCEHD, SECOR connected well DW-2R to the Pantoja Property home and disconnected the water supply tank 2.4.3 Domestic Well Nitrate Sample Collection and Results At the request of the SJCEHD, a technician from Far West Labs collected one water sample from domestic well DW-1 on August 11, 2000 The sample was analyzed for the Community Water Well Analytical Suite and found to exceed the drinking water standard for nitrate as (NO3) and nitrate plus nitrite as nitrogen (N) On September 21, 2000 SECOR's field geologist used a disposable bailer to collect a grab water sample from the domestic well DW-2, located on the Pantoja Property Far West Labs in Riverbank, Califomia analyzed the sample for the presence of nitrate as (NO3) and nitrate as nitrogen (N) and found the water exceeded the drinking water standard for both constituents On January 8, 2001, SECOR's field geologist collected a grab water sample from the pressure tank valve on domestic well DW-2R, located on the Pantoja Property California Laboratory Services in Rancho Cordova, California analyzed the sample for the presence of nitrate as (NO3) and nitrate as nitrogen (N) The water collected from well DW-2R that is screened from 208 to 248 feet bgs does not contain concentrations of Nitrate as NO3 or Nitrite as N above the regulatory Maximum Contaminant Levels The concentration of nitrate as NO3 and nitrate plus nitrite as nitrogen (N) found in the three water samples are shown below Well# Date Nitrate as NO3 Nitrite as N DW-1 8111100 78 8 mg1L <400 ug/L DW-2 9121100 60 2 mg1L 13,600 ug/L DW-2R 01/08/01 10 mg/L <400 ug/L MCL 45 0 mg1L 10,000 uglL File FRP-report doc SEC-OR International Incorporated