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Addendum to the Well Installation and <br /> Hydraulic Testing Report and Additional <br /> ARCADIS Well Installation Work Plan <br /> Former Occidental Chemical Corporation <br /> Lathrop, California <br /> the Simplot PSW; however, 140 micrograms per liter(Ng/L)sulfolane was detected in the Simplot BSW <br /> after approximately 15 minutes of purging. Due to the January sulfolane detections in the Simplot BSW, <br /> during June 2012,ARCADIS conducted a pumping test at the Simplot BSW to measure sulfolane <br /> concentrations while the well was purging at 200 gpm. Sulfolane was detected at concentrations up to <br /> 570 pg/L during the test. <br /> In addition, during March and July 2012, Simplot analyzed samples from their monitoring wells for <br /> sulfolane, DBCP and EDB. Simplot also provided GSH with a summary of sulfolane results from their <br /> monitoring wells in 2005. Results are summarized in Table 2. <br /> Table 2.Results of Groundwater Samples collected Near INJ-12 <br /> Location Zone Date Sampled Sulfolane(pg/L) DBCP(pg/L) EDB(N /L <br /> BSW Deep 3/6/2006 ND <20 --1/19/2012 150 -- -- <br /> 1/25/2012 140 0.023 ND <0.01 <br /> 6/19/2012 ND <20 to 570 ND <O.01 ND <0.01 <br /> PSW Deep 3/6/2006 ND <20 -- -- <br /> 1/19/2012 ND <20 -- -- <br /> 1/25/2012 ND <20 ND <O.01 ND <0.01 <br /> LP001 Water table 9/09/2005 290 -- -- <br /> 1/19/2012 -- ND <0.01 ND <0.02 <br /> 7/19/2012 200 -- -- <br /> LP002 Shallow 9/09/2005 1500 -- -- <br /> 1/19/2012 570 ND <0.01 ND <0.02 <br /> 7/19/2012 540 -- -- <br /> LP003 Water table 9/09/2005 ND <20 -- -- <br /> 1/19/2012 ND <20 ND(<0.01)— ND <0.02 <br /> 7/19/2012 ND <20 -- -- <br /> LP004 Water table 9/08/2005 ND <20 -- -- <br /> 1/19/2012 ND <20 ND <0.01 ND <0.02 <br /> 7/19/2012 ND <20 -- -- <br /> LP005 Water table 9/08/2005 ND <20 -- -- <br /> LP005B Water table 1/19/2012 ND <20 ND <0.01 ND <0.02 <br /> 7/19/2012 ND <20 -- -- <br /> LP006 Water table 9/08/2005 ND <20 -- -- <br /> 1/19/2012 ND <20 ND <0.01 ND <0.02 <br /> 7/19/2012 ND <20 -- -- <br /> LP007 Water table 9/08/2005 ND <20 -- -- <br /> 1/19/2012 ND <20 ND <0.01 ND <0.02 <br /> 7/19/2012 ND <20 -- -- <br /> LP008 Water table 1/19/2012 ND <20 ND <0.01 ND <0.02 <br /> 7/19/2012 ND <20 -- -- <br /> LP009 Water table 7/19/2012 ND <20 -- -- <br /> 2012-09-13 addendum well install work plan—hy test rpt.doc: 8 <br />