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        xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9
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  <!-- Homepage & Core Civil Gravel Calculator -->
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    <loc>https://gravelcalculatorpro.com/</loc>
    <lastmod>2026-09-19</lastmod>
    <changefreq>weekly</changefreq>
    <priority>1.0</priority>
  </url>

  <!-- About Us: Engineering Standards & ASTM Benchmarks -->
  <url>
    <loc>https://gravelcalculatorpro.com/about-us.html</loc>
    <lastmod>2026-09-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>

  <!-- Contact Us: Support Desk & Quarry Density Inquiries -->
  <url>
    <loc>https://gravelcalculatorpro.com/contact-us.html</loc>
    <lastmod>2026-09-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>

  <!-- Privacy Policy: Google AdSense, GDPR & CCPA Compliance -->
  <url>
    <loc>https://gravelcalculatorpro.com/privacy-policy.html</loc>
    <lastmod>2026-09-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.5</priority>
  </url>

  <!-- Terms of Service & Aggregate Estimation Disclaimer -->
  <url>
    <loc>https://gravelcalculatorpro.com/terms-of-service.html</loc>
    <lastmod>2026-09-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.5</priority>
  </url>
</urlset>
