OBS Engineering, Inc.

New Single-Family Housing Construction (except For-Sale Builders) ; Residential Remodelers; Water and Sewer Line and Related Structures Construction ; Land Subdivision ; Highway, Street, and Bridge Construction ; Other Heavy and Civil Engineering Construction; Poured Concrete Foundation and Structure Contractors ; Welding, on-site, contractors ; Site Preparation Contractors ; All Other Specialty Trade Contractors

NAICS 237310: Highway, Street, and Bridge Construction; CA WCC C1200: CONSTRUCTION AREA SIGNS; CA WCC C1201: TRAFFIC CONTROL SYSTEM; CA WCC C1211: TRAFFIC FLAGGER; CA WCC C1212: PILOT CAR SERVICES; CA WCC C1522: RESET, ADJUST ROADWAY ITEMS; CA WCC C1531: PLANE ASPHALT CONCRETE; CA WCC C1532: Remove Concrete; CA WCC C1575: REMOVE BRIDGE ITEM; CA WCC C1580: MODIFY BRIDGE ITEM; CA WCC C1601: CLEARING & GRUBBING; CA WCC C1901: ROADWAY EXCAVATION; CA WCC C1910: GRADING; CA WCC C1920: STRUCTURE EXCAVATION; CA WCC C1925: SHAPED BEDDING; CA WCC C1930: STRUCTURE BACKFILL; CA WCC C1940: DITCHES EXCAVATION; CA WCC C1970: EMBANKMENT CONSTRUCTION; CA WCC C1980: IMPORTED BORROW; CA WCC C2201: FINISHING ROADWAY; CA WCC C2501: AGGREGATE SUBBASE (AS); CA WCC C2602: AGGREGATE BASE (AB); CA WCC C3600: PENETRATION TREATMENT & PRIME COAT; CA WCC C3701: SEAL COAT; CA WCC C3901: ASPHALT CONCRETE; CA WCC C3930: PAVEMENT REINFORCING FABRIC; CA WCC C3940: PLACE ASPHALT CONCRETE DIKE & MISC; CA WCC C3990: RECYCLE, RECLAIM ASPHALT CONCRETE PAVEMENT; CA WCC C4906: CAST-IN-DRILLED-HOLE CONCRETE PILING; CA WCC C5100: CONCRETE STRUCTURE; CA WCC C5105: MINOR CONCRETE STRUCTURE; CA WCC C5110: CONCRETE SURFACE FINISH; CA WCC C5111: CONCRETE OVERLAY – DRILL & BOND; CA WCC C5620: ROADSIDE SIGN; CA WCC C6200: ALTERNATIVE PIPE CULVERT; CA WCC C6500: REINFORCED CONCRETE PIPE; CA WCC C6591: NON-REINFORCED CONCRETE PIPE; CA WCC C6650: CORRUGATED METAL PIPE (CSP); CA WCC C6800: SUBSURFACE DRAIN; CA WCC C6815: HORIZONTAL DRAIN; CA WCC C6819: FILTER FABRIC; CA WCC C6820: PERMEABLE MATERIAL; CA WCC C6900: DOWNDRAIN; CA WCC C7000: PLASTIC PIPE; CA WCC C7006: CORRUGATED STEEL PIPE INLET & RISER; CA WCC C7026: CORRUGATED STEEL PIPE ENGERY DISSIPATOR; CA WCC C7140: CLAY SEWER PIPE; CA WCC C7191: SEWER MANHOLE; CA WCC C7200: ROCK SLOPE PROTECTION; CA WCC C7301: CONCRETE CURB & SIDEWALK- MISC; CA WCC C7500: MISC IRON & STEEL FRAME, COVER & GRATE; CA WCC C8406: PAINTED TRAFFIC STRIPING & MARKING; CA WCC C9907: CONSTRUCTION EQUIPMENTAL RENTAL; CA WCC C9908: HEAVY EQUIPMENT RENTAL; CA WCC C9980: DEMOLITION; NAICS 237110: Water and Sewer Line and Related Structures Construction; NAICS 237990: Other Heavy and Civil Engineering Construction; NAICS 238110: Poured Concrete Foundation and Structure Contractors; NAICS 238120: Structural Steel and Precast Concrete Contractors; NAICS 238910: Site Preparation Contractors; NAICS 238990: All Other Specialty Trade Contractors; NAICS 488490: Other Support Activities for Road Transportation; NAICS 561990: All Other Support Services

CA WCC C1601: CLEARING & GRUBBING; CA WCC C1901: ROADWAY EXCAVATION; CA WCC C1910: GRADING; CA WCC C1970: EMBANKMENT CONSTRUCTION; CA WCC C2021: HYDROSEEDING; CA WCC C2030: EROSION CONTROL; CA WCC C2201: FINISHING ROADWAY; CA WCC C8773: CONSTRUCTION MANAGEMENT – HIGHWAY, STREET, AND BRIDGE CONSTRUCTION; NAICS 237110: Water and Sewer Line and Related Structures Construction; NAICS 237310: Highway, Street, and Bridge Construction; NAICS 237990: Other Heavy and Civil Engineering Construction; NAICS 238910: Site Preparation Contractors; NAICS 238990: All Other Specialty Trade Contractors; NAICS 561730: Landscaping Services

NAICS 237990: Other Heavy and Civil Engineering Construction; CA WCC C1522: RESET, ADJUST ROADWAY ITEMS; CA WCC C1531: PLANE ASPHALT CONCRETE; CA WCC C1601: CLEARING & GRUBBING; CA WCC C1901: ROADWAY EXCAVATION; CA WCC C1910: GRADING; CA WCC C1970: EMBANKMENT CONSTRUCTION; CA WCC C8774: CONSTRUCTION MANAGEMENT – LAND SUBDIVISION; CA WCC C9606: WATER TRUCK; NAICS 237210: Land Subdivision; NAICS 237310: Highway, Street, and Bridge Construction; NAICS 238910: Excavating, earthmoving or land clearing, mining (except overburden removal at open pit mine sites or quarries); NAICS 238910: Grading construction sites; NAICS 238910: Site Preparation Contractors; NAICS 484220: Dump trucking (e.g., gravel, sand, top-soil)