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Property and Equipment | 3 Months Ended
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Mar. 31, 2022
Property, Plant and Equipment [Abstract] |
Property and Equipment |
7. | PROPERTY AND EQUIPMENT
Property and equipment are summarized as follows:
|  | March 31, 2022 |  | December 31, 2021
Construction and transportation equipment |  | $ | 332,289 |  |  | $ | 316,381 |
Buildings and improvements |  | 24,298 |  |  | 24,042 |
Land |  | 3,891 |  |  | 3,891 |
Office equipment |  | 3,314 |  |  | 3,270 |
Total property and equipment |  | 363,792 |  |  | 347,584 |
Less accumulated depreciation |  | (151,189) |  |  | (143,268) |
Total property and equipment, net |  | $ | 212,603 |  |  | $ | 204,316 |
Depreciation Expense—Depreciation expense is primarily included within cost of revenues and was $8,199 and $5,439 for the three months ended March 31, 2022 and 2021, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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