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Santa Maria Ranch Subdivision, Phase II, Dayton, Nevada, letter to Dale Denio, Dayton Land Developers, L.L.C., Unpublished.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P.E., C.E.M., June 30, 2009, Santa Maria Ranch Subdivision, Phase II, Dayton, Nevada, letter to David Friedman, NDEP, Unpublished.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Santa Maria Ranch Subdivision, Phase II, Dayton, Nevada, letter to Dale Denio, Dayton Land Developers, L.L.C., Unpublished.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.

This feature class depicts the locations and analytical data for confirmation samples collected by Converse Consultants in 2006 within the top 2 feet of soil at finish grade in the Santa Maria Ranch Phase III Subdivision. These samples were intended to represent the potential exposure of residents after home construction and the sampling program and design was performed in accordance with guidelines of the draft Long-Term Sampling and Response Plan (LTSRP) in effect at that time. The following resource was used in compiling the dataset: Converse Consultants, Kathi Brandmueller, P.E., C.E.M., February 28, 2006, Percolation and Soil Testing, Santa Maria Ranch Phase III , Dayton, Nevada, letter to Dale Denio, Dayton Land Developers, L.L.C., Unpublished. Letter report describes the investigation and characterization sampling conducted within approximately 149 acres on the south side of the Carson River planned for 29 residential parcels. NDEP determined that 11 proposed parcel locations were within the FEMA 100-year flood plain of the Carson River and required collection of near surface samples within the top 2 feet and analysis for total mercury. Dayton Land Developers performed sampling at 4 locations selected on parcel boundaries between 8 of the contiguous parcels that extend into the floodplain. Report provides summary of analytical results and GPS coordinates of the 4 sample locations.

This feature class depicts the locations and analytical data for confirmation samples collected by Converse Consultants in 2006 within the top 2 feet of soil at finish grade in the Santa Maria Ranch Phase III Subdivision. These samples were intended to represent the potential exposure of residents after home construction and the sampling program and design was performed in accordance with guidelines of the draft Long-Term Sampling and Response Plan (LTSRP) in effect at that time. The following resource was used in compiling the dataset: Converse Consultants, Kathi Brandmueller, P.E., C.E.M., February 28, 2006, Percolation and Soil Testing, Santa Maria Ranch Phase III , Dayton, Nevada, letter to Dale Denio, Dayton Land Developers, L.L.C., Unpublished. Letter report describes the investigation and characterization sampling conducted within approximately 149 acres on the south side of the Carson River planned for 29 residential parcels. NDEP determined that 11 proposed parcel locations were within the FEMA 100-year flood plain of the Carson River and required collection of near surface samples within the top 2 feet and analysis for total mercury. Dayton Land Developers performed sampling at 4 locations selected on parcel boundaries between 8 of the contiguous parcels that extend into the floodplain. Report provides summary of analytical results and GPS coordinates of the 4 sample locations.

This feature class depicts the approximate locations and analytical data for initial samples taken by Pezonella Associates in 2003 as part of a Phase II Environmental Site Assessment study of the Santa Maria Ranch Phase I subdivision under the LTSRP. The following resources were used in compiling this dataset: Pezonella Associates, Inc., John H. Johnson, P.E., C.E.M., March 28, 2003, Soil Sampling, Santa Maria Ranch near Dayton, Lyon County, Nevada, letter report to North Tahoe Investments summarizing 40 shallow soil samples prior to construction, Unpublished. See reference below for the SMR Phase I tentative map defining how NDEP located the 40 soil sample locations collected in this study. Western Engineering & Surveying Services, Drawn by NGL and WTG, Checked by DW, December 2002, Tentative Map for Santa Maria Ranch (a Planned Unit Subdivision), Unpublished. Tentative map of planned subdivision residential parcel and planned infrastructure lay-out, Pezonella Associates March 28, 2003 letter report identifies the sample locations of the preliminary investigation by lot numbers identified on this tentative map. This tentative map was georeferenced and samples were located by arbitrarily placing the sample point at the centroid of lot sampled. Three control points were used in georeferencing with a first order polynomial transformation. For quality control, proposed lot boundaries on the tentative map were compared to existing parcel boundaries from the Lyon County Assessor’s office. The lot numbers associated with each sample point correspond to the original lot numbers as identified in the "Tentative Map for Santa Maria Ranch", produced by Western Engineering and Surveying Services in 2003. Lot numbers have since changed. The current lot numbers are indicated in the Santa Maria Ranch Phase I Parcels feature class.

This feature class depicts the approximate locations and analytical data for initial samples taken by Pezonella Associates in 2003 as part of a Phase II Environmental Site Assessment study of the Santa Maria Ranch Phase I subdivision under the LTSRP. The following resources were used in compiling this dataset: Pezonella Associates, Inc., John H. Johnson, P.E., C.E.M., March 28, 2003, Soil Sampling, Santa Maria Ranch near Dayton, Lyon County, Nevada, letter report to North Tahoe Investments summarizing 40 shallow soil samples prior to construction, Unpublished. See reference below for the SMR Phase I tentative map defining how NDEP located the 40 soil sample locations collected in this study. Western Engineering & Surveying Services, Drawn by NGL and WTG, Checked by DW, December 2002, Tentative Map for Santa Maria Ranch (a Planned Unit Subdivision), Unpublished. Tentative map of planned subdivision residential parcel and planned infrastructure lay-out, Pezonella Associates March 28, 2003 letter report identifies the sample locations of the preliminary investigation by lot numbers identified on this tentative map. This tentative map was georeferenced and samples were located by arbitrarily placing the sample point at the centroid of lot sampled. Three control points were used in georeferencing with a first order polynomial transformation. For quality control, proposed lot boundaries on the tentative map were compared to existing parcel boundaries from the Lyon County Assessor’s office. The lot numbers associated with each sample point correspond to the original lot numbers as identified in the "Tentative Map for Santa Maria Ranch", produced by Western Engineering and Surveying Services in 2003. Lot numbers have since changed. The current lot numbers are indicated in the Santa Maria Ranch Phase I Parcels feature class.

This feature class depicts the locations and analytical data for confirmation samples collected by Converse Consultants in 2006 within on the top 2 feet of soil at finish grade. These samples were intended to represent the potential exposure of residents after home construction and the sampling program and design was performed in accordance with guidelines of the draft LTSRP in effect at that time. The following resources were used in compiling this dataset: Converse Consultants, Kathi Brandmueller, P.E., C.E.M., January 5, 2006, Santa Maria Ranch Phase 1, Final Sampling Results, Dayton, Nevada, letter to Dale Denio, Dayton Land Developers, L.L.C. Report describes the collection of 445 samples collected after completion of finish grade on the Santa Maria Ranch Phase 1 residential properties. The report states an additional 28 samples were collected and analyzed in this effort for quality assurance/quality control purposes. This report also briefly summarizes work performed in the 35 acre “Old Pond” area. The report includes a summary table of analytical results titled “Santa (sic) Maria Ranch-Phase I Sampling at Final Lot Grade”. Analytical results from this summary table were associated with the corresponding sample ID to the respective map location. Converse Consultants, drafted by KIB, December 23, 2005, Final Sample Locations, Figure No. 1, sample location plan accompanying January 5, 2006 report referenced above. Figure 1 shows proposed Santa Maria Ranch Phase 1 parcel boundaries, streets and open space. It also includes roughly 35 acres of contiguous land east of the residential development proposed to remain as open space. Figure 1 maps the locations of 445 sample locations described in the Final Sampling Results report. Sample locations were mapped by digitizing the original hardcopy Figure 1 and matching to significant landmarks in the CRMS geodatabase base map and current Lyon County Assessor’s parcel map. Final samples were collected between March 2 and 15, 2005. The sample date in the attribute table refers to the final date of the sampling period. After final sampling completed, 10 additional lots were identified that required additional fill. Samples were collected in these lots on November 28 and 30, 2005.

This feature class depicts the locations and analytical data for confirmation samples collected by Converse Consultants in 2006 within on the top 2 feet of soil at finish grade. These samples were intended to represent the potential exposure of residents after home construction and the sampling program and design was performed in accordance with guidelines of the draft LTSRP in effect at that time. The following resources were used in compiling this dataset: Converse Consultants, Kathi Brandmueller, P.E., C.E.M., January 5, 2006, Santa Maria Ranch Phase 1, Final Sampling Results, Dayton, Nevada, letter to Dale Denio, Dayton Land Developers, L.L.C. Report describes the collection of 445 samples collected after completion of finish grade on the Santa Maria Ranch Phase 1 residential properties. The report states an additional 28 samples were collected and analyzed in this effort for quality assurance/quality control purposes. This report also briefly summarizes work performed in the 35 acre “Old Pond” area. The report includes a summary table of analytical results titled “Santa (sic) Maria Ranch-Phase I Sampling at Final Lot Grade”. Analytical results from this summary table were associated with the corresponding sample ID to the respective map location. Converse Consultants, drafted by KIB, December 23, 2005, Final Sample Locations, Figure No. 1, sample location plan accompanying January 5, 2006 report referenced above. Figure 1 shows proposed Santa Maria Ranch Phase 1 parcel boundaries, streets and open space. It also includes roughly 35 acres of contiguous land east of the residential development proposed to remain as open space. Figure 1 maps the locations of 445 sample locations described in the Final Sampling Results report. Sample locations were mapped by digitizing the original hardcopy Figure 1 and matching to significant landmarks in the CRMS geodatabase base map and current Lyon County Assessor’s parcel map. Final samples were collected between March 2 and 15, 2005. The sample date in the attribute table refers to the final date of the sampling period. After final sampling completed, 10 additional lots were identified that required additional fill. Samples were collected in these lots on November 28 and 30, 2005.

This feature class depicts the locations and analytical data for the initial borrow samples taken by Converse Consultants in 2004 during construction of Santa Maria Ranch Phase I. The following resources were used in compiling this dataset: Converse Consultants, Kathi Brandmueller, P.E., C.E.M., February 29, 2004, Borrow Area Testing, Santa Maria Ranch, U-Save Cleaners(sic), Dayton, Nevada, Unpublished. Letter report to Dale Denio, North Tahoe Investment Group, L.L.C. summarizing 12 soil samples collected from test pits in vicinity of a historic pond called the "Old Pond” located on site. Converse Consultants, Kathi Brandmueller, P.E., C.E.M., July 27, 2004, Santa Maria Ranch, Dayton, Nevada, letter to Dale Denio, Dayton Land Developers, L.L.C., Unpublished. Letter report summarizing sampling and removal activities conducted February 19, 2004 through June 14, 2004 during site preparation and grubbing (mass grading) activities. Report describes 9 test pits excavated and sampled in areas of proposed borrow for backfill during construction, 12 soil samples from the historic pond area (Old Pond) reported in the February 29, 2004 report referenced above and 70 soil samples collected from across the site to assess and monitor areas of disturbed soil. The report’s analytical summary tables are categorized as Borrow Area Test Pits, Old Pond Area, and Mass Grading. Converse Consultants, drafted by KJB and checked by KIB, July 27, 2004, Test Pit Location Diagram, Figure No. 1, Unpublished. Sample location plan accompanying July 27, 2004 report referenced above. Figure 1 shows proposed Santa Maria Ranch Phase 1 parcel boundaries, streets and open space. It also includes roughly 35 acres of the eastern section of the property proposed to remain as open space. Figure 1 maps the locations of 128 sample locations, 64 locations labeled as "Sample Location Borrow” and 64 locations labeled as "Sample Location Fill". Those locations identified as "Sample Location Fill” indicate the analytical result of the mercury concentration reported in mg/kg at the associated sample depth. The "Sample Location Fill” locations have no sample ID associated with them. The "Sample Location Borrow” locations have only a sample ID number associated with them. Sample concentrations have been associated with mapped locations using the report’s summary tables. No geographic coordinates were provide by Converse Consultants in the narrative report or on the accompanying figure. Sample locations were mapped by digitizing the original hardcopy Figure 1 and matching to significant landmarks in the CRMS geodatabase base map and current Lyon County Assessor’s parcel map. Additional Notes: Records with null values for mercury_results represent ND (non-detection). The test pit location diagram (Figure 1) contains fewer sample locations than indicated in the results table (65 on the map, vs. 68 in the results table). No results values were provided for fill samples, so those features are ommitted from this feature class. The test pit location diagram contains duplicate sample IDs; some of these sample IDs do not match those in the table. The best efforts were made to match up the sample locations on the map with the correct results.

This feature class depicts the locations and analytical data for the initial borrow samples taken by Converse Consultants in 2004 during construction of Santa Maria Ranch Phase I. The following resources were used in compiling this dataset: Converse Consultants, Kathi Brandmueller, P.E., C.E.M., February 29, 2004, Borrow Area Testing, Santa Maria Ranch, U-Save Cleaners(sic), Dayton, Nevada, Unpublished. Letter report to Dale Denio, North Tahoe Investment Group, L.L.C. summarizing 12 soil samples collected from test pits in vicinity of a historic pond called the "Old Pond” located on site. Converse Consultants, Kathi Brandmueller, P.E., C.E.M., July 27, 2004, Santa Maria Ranch, Dayton, Nevada, letter to Dale Denio, Dayton Land Developers, L.L.C., Unpublished. Letter report summarizing sampling and removal activities conducted February 19, 2004 through June 14, 2004 during site preparation and grubbing (mass grading) activities. Report describes 9 test pits excavated and sampled in areas of proposed borrow for backfill during construction, 12 soil samples from the historic pond area (Old Pond) reported in the February 29, 2004 report referenced above and 70 soil samples collected from across the site to assess and monitor areas of disturbed soil. The report’s analytical summary tables are categorized as Borrow Area Test Pits, Old Pond Area, and Mass Grading. Converse Consultants, drafted by KJB and checked by KIB, July 27, 2004, Test Pit Location Diagram, Figure No. 1, Unpublished. Sample location plan accompanying July 27, 2004 report referenced above. Figure 1 shows proposed Santa Maria Ranch Phase 1 parcel boundaries, streets and open space. It also includes roughly 35 acres of the eastern section of the property proposed to remain as open space. Figure 1 maps the locations of 128 sample locations, 64 locations labeled as "Sample Location Borrow” and 64 locations labeled as "Sample Location Fill". Those locations identified as "Sample Location Fill” indicate the analytical result of the mercury concentration reported in mg/kg at the associated sample depth. The "Sample Location Fill” locations have no sample ID associated with them. The "Sample Location Borrow” locations have only a sample ID number associated with them. Sample concentrations have been associated with mapped locations using the report’s summary tables. No geographic coordinates were provide by Converse Consultants in the narrative report or on the accompanying figure. Sample locations were mapped by digitizing the original hardcopy Figure 1 and matching to significant landmarks in the CRMS geodatabase base map and current Lyon County Assessor’s parcel map. Additional Notes: Records with null values for mercury_results represent ND (non-detection). The test pit location diagram (Figure 1) contains fewer sample locations than indicated in the results table (65 on the map, vs. 68 in the results table). No results values were provided for fill samples, so those features are ommitted from this feature class. The test pit location diagram contains duplicate sample IDs; some of these sample IDs do not match those in the table. The best efforts were made to match up the sample locations on the map with the correct results.