Soil investigation in the Riverpark subdivision took place over several phases. This feature class contains final grade samples taken in Phases III and IV. Resource Concepts, Inc. conducted the soil sampling on behalf of the developer Lennar Homes. All final reports were transmitted to NDEP. Each lot was sampled at two locations: one in the front yard and one in the back yard. One of the samples represented soils from 0 -1 foot below grade (fbg), and the other represented soils from 1- 2 fbg. Samples for each unit were taken over a span of several days. Sample date provided in the attribute table lists the final date of sampling. Sample date ranges for each unit are listed below: Phase III Unit 8: Samples were collected on December 28, 2004. Unit 11: Samples were collected between March 1 and March 6, 2006. Unit 12: Samples were collected between March 7 and March 9, 2006. Unit 13: Samples were collected between March 6 and March 15, 2006. Unit 14: Samples were collected on March 20, March 23, and March 24, 2006. Unit 15: Samples were collected between August 22 and August 28, 2006. Phase IV Unit 1: Samples were collected on October 10 and October 11, 2006. Unit 2: Samples were collected on October 25 and October 26, 2006. Unit 3: Samples were collected on April 3 and April 5, 2007. Unit 4: Samples were collected on November 28 and November 29, 2006. All samples were surveyed in the field using a Trimble 5800 survey-grade GPS receiver tied into centerline monuments. All sample results below the 0.05 mg/kg detection limit are recorded as ND (Non-Detectable). Sample locations were mapped by digitizing the original hardcopy of the following report figures: Figure 1-A, Official Plat of Riverpark Phase 4 Unit 1(Summit Engineering Corp., modified October 9, 2006), Figure 2-A Official Plat of Riverpark Phase 4 Unit 2(Summit Engineering Corp., modified October 9, 2006),Figure 3-A Official Plat of Riverpark Phase 4 Unit 3(Summit Engineering Corp., modified May 22, 2007), Figure 4- A, Official Plat of Riverpark Phase 4 Unit 4 (Summit Engineering Corp., modified November 27, 2006). Figure 8A, Final Subdivision for Riverpark Unit 8 (TEC Civil Engineering Consultants, modified April 21, 2006); Figure 8B Final Subdivision for Riverpark Unit 8 (TEC Civil Engineering Consultants, modified April 21, 2006); Final Subdivision for Riverpark Phase 3 Unit 13 (Harlan King and Assocs., modified March 7, 2006) and Final Subdivision for Riverpark Phase 3 Unit 14 (Harlan King and Assocs., modified March 9, 2006). Figure 11-A Revised, Final Subdivision Plat for Riverpark Unit 11 ( TEC Civil Engineering Consultants., modified March 29, 2006); Figure 12-A Revised, Final Subdivision Plat for Riverpark Unit 12 (TEC Civil Engineering Consultants., modified March 29, 2006). Figure 13-A, Final Map of Riverpark Phase 3 Unit 13 for Riverpark Properties, LLC (Harlan King and Assocs., modified March 29, 2006), Figure 15-A, Final Map of Riverpark Phase 3 Unit 15 for Riverpark Properties, LLC (Harlan King and Assocs., modified March 8, 2006). These figures include the note "Sample site locations are approximate relative to lot lines in this figure." Georeferencing of the sample locations included matching significant landmarks identified on the figures contained in the report to the CRMS geodatabase base map and current Lyon County Assessorâ??s parcel map. Report figures and more information on field sampling procedures can be found in the following source documents: Resource Concepts, Inc., Robin A. Eppard, C.E.M., January 28, 2005, Pre-Grade Sample Data, Surface Samples, Phase I Environmental Site Assessment, Report for Reynen and Bardis Communities, Unpublished. Resource Concepts, Inc., Robin A. Eppard, C.E.M., December 2004, UNIT 8 Sampling and Analysis Plan, Mercury in Soils at Final Grade, Prepared for Reynen and Bardis, Unpublished. Resource Concepts, Inc., Robin A. Eppard, C.E.M., Carson River Mercury Site Reference Document, Riverpark Subdivision, Units 8,

Soil investigation in the Riverpark subdivision took place over several phases. This feature class contains final grade samples taken in Phases III and IV. Resource Concepts, Inc. conducted the soil sampling on behalf of the developer Lennar Homes. All final reports were transmitted to NDEP. Each lot was sampled at two locations: one in the front yard and one in the back yard. One of the samples represented soils from 0 -1 foot below grade (fbg), and the other represented soils from 1- 2 fbg. Samples for each unit were taken over a span of several days. Sample date provided in the attribute table lists the final date of sampling. Sample date ranges for each unit are listed below: Phase III Unit 8: Samples were collected on December 28, 2004. Unit 11: Samples were collected between March 1 and March 6, 2006. Unit 12: Samples were collected between March 7 and March 9, 2006. Unit 13: Samples were collected between March 6 and March 15, 2006. Unit 14: Samples were collected on March 20, March 23, and March 24, 2006. Unit 15: Samples were collected between August 22 and August 28, 2006. Phase IV Unit 1: Samples were collected on October 10 and October 11, 2006. Unit 2: Samples were collected on October 25 and October 26, 2006. Unit 3: Samples were collected on April 3 and April 5, 2007. Unit 4: Samples were collected on November 28 and November 29, 2006. All samples were surveyed in the field using a Trimble 5800 survey-grade GPS receiver tied into centerline monuments. All sample results below the 0.05 mg/kg detection limit are recorded as ND (Non-Detectable). Sample locations were mapped by digitizing the original hardcopy of the following report figures: Figure 1-A, Official Plat of Riverpark Phase 4 Unit 1(Summit Engineering Corp., modified October 9, 2006), Figure 2-A Official Plat of Riverpark Phase 4 Unit 2(Summit Engineering Corp., modified October 9, 2006),Figure 3-A Official Plat of Riverpark Phase 4 Unit 3(Summit Engineering Corp., modified May 22, 2007), Figure 4- A, Official Plat of Riverpark Phase 4 Unit 4 (Summit Engineering Corp., modified November 27, 2006). Figure 8A, Final Subdivision for Riverpark Unit 8 (TEC Civil Engineering Consultants, modified April 21, 2006); Figure 8B Final Subdivision for Riverpark Unit 8 (TEC Civil Engineering Consultants, modified April 21, 2006); Final Subdivision for Riverpark Phase 3 Unit 13 (Harlan King and Assocs., modified March 7, 2006) and Final Subdivision for Riverpark Phase 3 Unit 14 (Harlan King and Assocs., modified March 9, 2006). Figure 11-A Revised, Final Subdivision Plat for Riverpark Unit 11 ( TEC Civil Engineering Consultants., modified March 29, 2006); Figure 12-A Revised, Final Subdivision Plat for Riverpark Unit 12 (TEC Civil Engineering Consultants., modified March 29, 2006). Figure 13-A, Final Map of Riverpark Phase 3 Unit 13 for Riverpark Properties, LLC (Harlan King and Assocs., modified March 29, 2006), Figure 15-A, Final Map of Riverpark Phase 3 Unit 15 for Riverpark Properties, LLC (Harlan King and Assocs., modified March 8, 2006). These figures include the note "Sample site locations are approximate relative to lot lines in this figure." Georeferencing of the sample locations included matching significant landmarks identified on the figures contained in the report to the CRMS geodatabase base map and current Lyon County Assessorâ??s parcel map. Report figures and more information on field sampling procedures can be found in the following source documents: Resource Concepts, Inc., Robin A. Eppard, C.E.M., January 28, 2005, Pre-Grade Sample Data, Surface Samples, Phase I Environmental Site Assessment, Report for Reynen and Bardis Communities, Unpublished. Resource Concepts, Inc., Robin A. Eppard, C.E.M., December 2004, UNIT 8 Sampling and Analysis Plan, Mercury in Soils at Final Grade, Prepared for Reynen and Bardis, Unpublished. Resource Concepts, Inc., Robin A. Eppard, C.E.M., Carson River Mercury Site Reference Document, Riverpark Subdivision, Units 8,

URS Corporation (URS) developed a Sampling and Analysis Plan in September 2011 that was consistent with the CRMS draft Long Term Sampling and Response Plan. URS submitted a draft SAP to NDEP for review and incorporated NDEP’s comments in the Final SAP. In October and November 2011, URS performed a Phase II ESA on the Site. The purpose of the investigation was to evaluate if impacts related to the CRMS are present on the 138 undeveloped residential lots and one partially developed lot. The lots subject to the Phase II ESA were owned by two separate entities and the Phase II ESA was divided accordingly. Section I: URS sampled lots 2 - 160, located in the westernmost section of the subdivision. Samples took place between 10/24/2011 and 11/2/2011. The sample date in the attribute table indicates the last date in the sampling period for this segment. Section 2: URS Corporation sampled lots M41 - M86, located in the easternmost section of the subdivision. Samples took place between 10/26/2011 and 11/1/2011. The sample date in the attribute table indicates the last date in the sampling period for this segment. Sample locations were collected using a Trimble GeoXT GPS unit. Analytical data for each sample point is contained with the related table, OndaVerde_SampleResults. Parameters sampled include mercury, arsenic, and lead. Detailed information on the sampling procedure and laboratory analysis can be found in the following documents: URS Corporation, Earl James Leaver, P.E., C.E.M., January 11, 2012, Phase II Environmental Site Investigation, ESA103278 Onda Verde L.L.C., North Side of Coleman Road and East of Highway 50, Fallon, NV 89510, letter report to Jack Yates, NDEP, Unpublished URS Corporation, Earl James Leaver, P.E., C.E.M., January 11, 2012, Phase II Environmental Site Investigation, ESA102893 Michael Munoz, 2160 Verona Drive, Fallon, NV 89510, letter report to Jack Yates, NDEP, Unpublished.

URS Corporation (URS) developed a Sampling and Analysis Plan in September 2011 that was consistent with the CRMS draft Long Term Sampling and Response Plan. URS submitted a draft SAP to NDEP for review and incorporated NDEP’s comments in the Final SAP. In October and November 2011, URS performed a Phase II ESA on the Site. The purpose of the investigation was to evaluate if impacts related to the CRMS are present on the 138 undeveloped residential lots and one partially developed lot. The lots subject to the Phase II ESA were owned by two separate entities and the Phase II ESA was divided accordingly. Section I: URS sampled lots 2 - 160, located in the westernmost section of the subdivision. Samples took place between 10/24/2011 and 11/2/2011. The sample date in the attribute table indicates the last date in the sampling period for this segment. Section 2: URS Corporation sampled lots M41 - M86, located in the easternmost section of the subdivision. Samples took place between 10/26/2011 and 11/1/2011. The sample date in the attribute table indicates the last date in the sampling period for this segment. Sample locations were collected using a Trimble GeoXT GPS unit. Analytical data for each sample point is contained with the related table, OndaVerde_SampleResults. Parameters sampled include mercury, arsenic, and lead. Detailed information on the sampling procedure and laboratory analysis can be found in the following documents: URS Corporation, Earl James Leaver, P.E., C.E.M., January 11, 2012, Phase II Environmental Site Investigation, ESA103278 Onda Verde L.L.C., North Side of Coleman Road and East of Highway 50, Fallon, NV 89510, letter report to Jack Yates, NDEP, Unpublished URS Corporation, Earl James Leaver, P.E., C.E.M., January 11, 2012, Phase II Environmental Site Investigation, ESA102893 Michael Munoz, 2160 Verona Drive, Fallon, NV 89510, letter report to Jack Yates, NDEP, Unpublished.

This feature class is converted from GPS coordinates obtained using a GPSmap 60CSx unit from Garmin in the field by AEI Consultants. The attribute information is filled with contaminant (Arsenic, Lead, Mercury) concentrations of soils derived from the Shallow Subsurface Investigation provided by AEI Consultants dated on January 11, 2013. For more information on soil sampling field procedures, refer to the following source documents: AEI Consultants, Peter J. McIntyre, C.E.M., October 16, 2012, Draft Phase II Subsurface Investigation Work Plan Carson River Estates, Dayton, Nevada, report to Jack Yates, NDEP, Unpublished, AEI Consultants, Bryan Campbell, Program Manager, October 31, 2012, Identification of Revisions to the Draft Phase II Subsurface Investigation Work Plan Carson River Estates, Dayton, Nevada date October 16, 2012, Electronic mail correspondence to Jeff Collins, NDEP, Unpublished, AEI Consultants, Peter J. McIntyre, C.E.M., January 11, 2013, Shallow Subsurface Investigation, Property Identification: Carson River Estates, Dayton, Nevada, report to Chris Carlson, Sr. Vice-President, City National Bank, Unpublished. Note: Generally, five composite sample points are respectively collected at the front and backyard in one parcel. However errors occurred in two parcels: APN=2952402 and APN=2952202. In the parcel 2952402, there are nine sample points. The other sample point (Sample ID=524-02-05) is found at the parcel 2952202 and overlied with one sample points (Sample ID=522-02-04) of the parcel 2952202. According to checking the Shallow Subsurface Investigation provided by AEI Consultants dated on January 11, 2013, the originial GPS coordinates of both sample points (Sample ID=524-02-05 and Sample ID=522-02-04) are the same.

This feature class is converted from GPS coordinates obtained using a GPSmap 60CSx unit from Garmin in the field by AEI Consultants. The attribute information is filled with contaminant (Arsenic, Lead, Mercury) concentrations of soils derived from the Shallow Subsurface Investigation provided by AEI Consultants dated on January 11, 2013. For more information on soil sampling field procedures, refer to the following source documents: AEI Consultants, Peter J. McIntyre, C.E.M., October 16, 2012, Draft Phase II Subsurface Investigation Work Plan Carson River Estates, Dayton, Nevada, report to Jack Yates, NDEP, Unpublished, AEI Consultants, Bryan Campbell, Program Manager, October 31, 2012, Identification of Revisions to the Draft Phase II Subsurface Investigation Work Plan Carson River Estates, Dayton, Nevada date October 16, 2012, Electronic mail correspondence to Jeff Collins, NDEP, Unpublished, AEI Consultants, Peter J. McIntyre, C.E.M., January 11, 2013, Shallow Subsurface Investigation, Property Identification: Carson River Estates, Dayton, Nevada, report to Chris Carlson, Sr. Vice-President, City National Bank, Unpublished. Note: Generally, five composite sample points are respectively collected at the front and backyard in one parcel. However errors occurred in two parcels: APN=2952402 and APN=2952202. In the parcel 2952402, there are nine sample points. The other sample point (Sample ID=524-02-05) is found at the parcel 2952202 and overlied with one sample points (Sample ID=522-02-04) of the parcel 2952202. According to checking the Shallow Subsurface Investigation provided by AEI Consultants dated on January 11, 2013, the originial GPS coordinates of both sample points (Sample ID=524-02-05 and Sample ID=522-02-04) are the same.

This feature class is converted from GPS coordinates obtained using a GPSmap 60CSx unit from Garmin in the field by AEI Consultants. The attribute information is filled with contaminant (Arsenic, Lead, Mercury) concentrations of soils derived from the Shallow Subsurface Investigation provided by AEI Consultants dated on January 11, 2013. For more information on soil sampling field procedures, refer to the following source documents: AEI Consultants, Peter J. McIntyre, C.E.M., October 16, 2012, Draft Phase II Subsurface Investigation Work Plan Carson River Estates, Dayton, Nevada, report to Jack Yates, NDEP, Unpublished, AEI Consultants, Bryan Campbell, Program Manager, October 31, 2012, Identification of Revisions to the Draft Phase II Subsurface Investigation Work Plan Carson River Estates, Dayton, Nevada date October 16, 2012, Electronic mail correspondence to Jeff Collins, NDEP, Unpublished, AEI Consultants, Peter J. McIntyre, C.E.M., January 11, 2013, Shallow Subsurface Investigation, Property Identification: Carson River Estates, Dayton, Nevada, report to Chris Carlson, Sr. Vice-President, City National Bank, Unpublished. Note: Generally, five composite sample points are respectively collected at the front and backyard in one parcel. However errors occurred in two parcels: APN=2952402 and APN=2952202. In the parcel 2952402, there are nine sample points. The other sample point (Sample ID=524-02-05) is found at the parcel 2952202 and overlied with one sample points (Sample ID=522-02-04) of the parcel 2952202. According to checking the Shallow Subsurface Investigation provided by AEI Consultants dated on January 11, 2013, the originial GPS coordinates of both sample points (Sample ID=524-02-05 and Sample ID=522-02-04) are the same.

This feature class depicts the locations and analytical data for the soil samples taken by Converse Consultants in 2009. These samples represent a preliminary site characterization and the sample design was biased to the Town Ditch where it ran through the proposed development. Converse Consultants believed this diversion ditch represented a "most likely" source of contamination within the proposed development as it diverted water and sediment from the Carson River in vicinity of Winter Ranch. NDEP provided comment to the proposed sample design and additional sample locations were added. The following resources were used in compiling this dataset: Converse Consultants, Kathi Brandmueller, P.E., C.E.M., January 19, 2009, Soil Sampling, Santa Maria Ranch Subdivision, Phase II, Dayton, Nevada, letter to Dale Denio, Dayton Land Developers, L.L.C., Unpublished. Preliminary soil sampling conducted prior to development. Sampling in this investigation restricted to 9 locations located within the former Town Ditch. Two soil samples analyzed from each location representing 0 to 1ft below ground surface and 1 to 2 ft below ground surface. Converse Consultants, Kathi Brandmueller, P.E., C.E.M., June 30, 2009, Santa Maria Ranch Subdivision, Phase II, Dayton, Nevada, letter to David Friedman, NDEP, Unpublished. This letter transmits the GPS coordinates of the 9 locations of the soil samples collected from the Town Ditch and provides explanation of the sample design rationale as requested by NDEP. Converse Consultants, Kathi Brandmueller, P.E., C.E.M., December 10, 2009, Soil Sampling, Santa Maria Ranch Subdivision, Phase II, Dayton, Nevada, letter to Dale Denio, Dayton Land Developers, L.L.C., Unpublished. Preliminary soil sampling conducted prior to development. This report of a supplemental investigation to the work reported in the January 19, 2009 document. The supplemental study was conducted at the request of NDEP after reviewing the January 19, 2009 findings report and sample design rationale described by Converse Consultants in the June 30, 2009 letter. NDEP requested additional samples be collected from three other areas with potential contamination within the proposed SMR Phase II study area. These areas of suspected contamination include Daney Canyon drainage, the Carson River 100-year floodplain and the historic Ophir Mill site. Near surface soil samples collected near the Ophir Mill site with high levels of mercury detected were reported in the CRMS OU1 RI. Five additional locations were sampled in this supplemental study. Two soil samples analyzed from each location representing 0 to 1ft below ground surface and 1 to 2 ft below ground surface. GPS coordinates for the 5 additional locations were provided in this report.

This feature class depicts the locations and analytical data for the soil samples taken by Converse Consultants in 2009. These samples represent a preliminary site characterization and the sample design was biased to the Town Ditch where it ran through the proposed development. Converse Consultants believed this diversion ditch represented a "most likely" source of contamination within the proposed development as it diverted water and sediment from the Carson River in vicinity of Winter Ranch. NDEP provided comment to the proposed sample design and additional sample locations were added. The following resources were used in compiling this dataset: Converse Consultants, Kathi Brandmueller, P.E., C.E.M., January 19, 2009, Soil Sampling, Santa Maria Ranch Subdivision, Phase II, Dayton, Nevada, letter to Dale Denio, Dayton Land Developers, L.L.C., Unpublished. Preliminary soil sampling conducted prior to development. Sampling in this investigation restricted to 9 locations located within the former Town Ditch. Two soil samples analyzed from each location representing 0 to 1ft below ground surface and 1 to 2 ft below ground surface. Converse Consultants, Kathi Brandmueller, P.E., C.E.M., June 30, 2009, Santa Maria Ranch Subdivision, Phase II, Dayton, Nevada, letter to David Friedman, NDEP, Unpublished. This letter transmits the GPS coordinates of the 9 locations of the soil samples collected from the Town Ditch and provides explanation of the sample design rationale as requested by NDEP. Converse Consultants, Kathi Brandmueller, P.E., C.E.M., December 10, 2009, Soil Sampling, Santa Maria Ranch Subdivision, Phase II, Dayton, Nevada, letter to Dale Denio, Dayton Land Developers, L.L.C., Unpublished. Preliminary soil sampling conducted prior to development. This report of a supplemental investigation to the work reported in the January 19, 2009 document. The supplemental study was conducted at the request of NDEP after reviewing the January 19, 2009 findings report and sample design rationale described by Converse Consultants in the June 30, 2009 letter. NDEP requested additional samples be collected from three other areas with potential contamination within the proposed SMR Phase II study area. These areas of suspected contamination include Daney Canyon drainage, the Carson River 100-year floodplain and the historic Ophir Mill site. Near surface soil samples collected near the Ophir Mill site with high levels of mercury detected were reported in the CRMS OU1 RI. Five additional locations were sampled in this supplemental study. Two soil samples analyzed from each location representing 0 to 1ft below ground surface and 1 to 2 ft below ground surface. GPS coordinates for the 5 additional locations were provided in this report.

URS Corporation (URS) developed a Sampling and Analysis Plan in September 2011 that was consistent with the CRMS draft Long Term Sampling and Response Plan. URS submitted a draft SAP to NDEP for review and incorporated NDEP’s comments in the Final SAP. In October and November 2011, URS performed a Phase II ESA on the Site. The purpose of the investigation was to evaluate if impacts related to the CRMS are present on the 138 undeveloped residential lots and one partially developed lot. The lots subject to the Phase II ESA were owned by two separate entities and the Phase II ESA was divided accordingly. Section I: URS sampled lots 2 - 160, located in the westernmost section of the subdivision. Samples took place between 10/24/2011 and 11/2/2011. The sample date in the attribute table indicates the last date in the sampling period for this segment. Section 2: URS Corporation sampled lots M41 - M86, located in the easternmost section of the subdivision. Samples took place between 10/26/2011 and 11/1/2011. The sample date in the attribute table indicates the last date in the sampling period for this segment. Sample locations were collected using a Trimble GeoXT GPS unit. Analytical data for each sample point is contained with the related table, OndaVerde_SampleResults. Parameters sampled include mercury, arsenic, and lead. Detailed information on the sampling procedure and laboratory analysis can be found in the following documents: URS Corporation, Earl James Leaver, P.E., C.E.M., January 11, 2012, Phase II Environmental Site Investigation, ESA103278 Onda Verde L.L.C., North Side of Coleman Road and East of Highway 50, Fallon, NV 89510, letter report to Jack Yates, NDEP, Unpublished URS Corporation, Earl James Leaver, P.E., C.E.M., January 11, 2012, Phase II Environmental Site Investigation, ESA102893 Michael Munoz, 2160 Verona Drive, Fallon, NV 89510, letter report to Jack Yates, NDEP, Unpublished.