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Table 3.1: Volatile Organic Compounds, Analytical Results, Vapor Extraction Wells and Upper Aquifer Wells <br /> Second Quarter 2006 Site Status Report <br /> Former Nestle USA, Inc. Facility, Ripon, CA <br /> Average PDB Sample cis-1,2- trans-1,2- <br /> Samplel_acation Sample Method Sampling Frequency Trichloroethene Vinyl Chloride Chloroform Comments/Others <br /> Depth (ft, bgs) Date Dichloroethene Dichloroethene <br /> USEPA Method 8021 and 524, micrograms per liter(ppb) <br /> M-15B NS - B - - - - Sampled in odd-numbered <br /> _ years <br /> M-16BPDB _ 37 A 4125106 <0.5 <0.5 <0.5 <0.5 <1 W <br /> M-17A _ PDB 93.5 A B - 4/19/06 1.9 <0.5 <0.5 <0.5 <1 <br /> M-176 PDB 37.5 B 4125106 <0,5 <0.5 <0.5 <0.5 <1 _ Sampled more frequently <br /> than required. <br /> M-18A PDB 93.5 A 513/06 16 <0.5 13 <0.5 <1 __- <br /> M-18B PDB 37.5 B 4/25106 <0.5 <0.5 <0.5 <0.5 <1 Sampled more frequently <br /> than required. <br /> M-22A PDB 103.1 A 513106 15 <br /> <0.5 60 <0.5 <1 <br /> M-22B PDB 3.5 B 4125106 <0.5 <0.5 <0.5 <.0.5 <1 Sampled more frequently <br /> than required. <br /> M-23A PDB 87.3 A 4119106 24 <0.5 4.7 3.4 24 <br /> <1 <br /> M-27A PDB <0.5 <0.5 <0.5 97.5 Q (SA) 513106 <fl.5 _ _ <br /> M-28BIA A Purge - Q SA 4117106 <0.5 <0.5 <0.5 <0.5 <1 <br /> M-32A PDB 74.5 NR (Q (f)) 4118106 18 <0.5 4.2 9 <1 <br /> M-34A PDB 81.5 NR <0.5 <0.5 <0.5 <1 Q f ) 4118106 <0.5 _ <br /> M-35A PDB 117.5 NR Q f 4118/06 <0.5 <0.5 <0.5 <0.5 <1 <br /> M-356 PDB 62.5 NR Q 4118106 <0.5 <br /> <0.5 <0.5 <0.5 <1 <br /> Notes: <br /> ppb = parts per billion <br /> msl:Above mean sea level <br /> bgs: below ground surface <br /> B: Biennial sampling (odd-numbered years) <br /> A: Annual sampling <br /> SA: Semi-annual sampling <br /> M: Monthly sampling <br /> Q: Quarterly sampling <br /> - : Data Not available or Unknown. <br /> (a)Groundwater elevation and depth to groundwater from surface will be measured at each monitoring well and accessible supply well in this table on a quarterly basis. <br /> (b) Nestle can sample more frequently than required. However, results from additional samples must be provided to the CVRWQCB for review. <br /> (c)Sampling is not required. Measurement of quarterly groundwater elevations are required. <br /> (d)Sample if it becomes operational <br /> (e) Sampling frequency required for private supply wells that have wellhead treatment units installed by Nestle. <br /> (f) New wells installed in 2005 proposed for monitoring quarterly in 2006. In 2007, monitoring frequency proposed to be reevaluated (Environmental Cost Management, Inc., Draft Well Installation Report For Plume Delineation South of the Stanislaus River, <br /> Former Nestle USA, Inc. Facility, Ripon, California, December 16, 2005). Quarterly sampling proposed in the 2005 Annual Report that is awaiting RWQCB.approval. <br /> (g)The 2005 Annual Report requests removal from monitoring program, for example, the well is abandonedldetroyed or monitoring is not possible. <br /> Inf/Eff: Influent and Effluent sampling (occurs monthly for operating extraction wells) <br /> NR: Not Required. <br /> Sampling frequency schedule agreement established between Nestle and RWQCB on 7121/05. <br /> (SAMPLING FREQUENCY) = Bold Sampling Frequency in Parentheses shows change proposed in the 2005 Annual Report that is awaiting RWQCB approval. <br /> NS: Not Sampled <br /> Page 2 of 2 <br />