As a subcontractor to S&B Christ Consulting, LLC, Cerrudo Services managed and performed the construction of drainage and erosion controls for Yuma Proving Grounds, Yuma AZ. At the Laguna Army Airfield (LAAF) Sewer Ponds we constructed a retention basin protected with rip rap on the north side, where the heavy rains will drain into the basin. A drainage system was provided for the residential neighborhood consisting of manholes, a drop inlet, reinforced concrete pipe (RCP) and a retention basin located at the back and to the side of the medical clinic at the Howard Cantonment Lower Housing.
A 1-2 foot berm was provided, protected with rip rap around the east and south sides of the sewer lagoon at the HCA Sewer Ponds. A V-ditch was constructed in front of the berm for heavy rain to drain to the south west end into a culvert.
At the Walker Cantonment (WCA) Buildings 2468 and 2466 portion of the work, surveying and potholing was provided for utilities before beginning work on a v-ditch with side slopes as well as a 5-foot trapezoidal ditch around the northwest and south sides of two buildings to create a drainage system during heavy rains. A retention basin with rip-rap protected berm was constructed in the south lot adjacent to Building 2468.
Cerrudo Services designed and constructed of a portion of the Hamilton Wetlands Restoration Project, responsible for design of a 9 foot high, 6,600 LF Wildlife Corridor Berm with a 16 foot wide aggregate crown road, a Panne Berm, five Intertidal Berms and a Settling Basin.
Construction activities required relocation and grading of approximately 76,000 CY of contaminated soil, prior to construction of the Wildlife Corridor Berm. The berm construction utilized fill material from on site borrow areas that was excavated and transported for placement. Total compacted clay fill exceeded 111,000 cubic yards in the berm structure.
Cerrudo demolished four runway concrete revetments and over one thousand LF feet of taxiway. Challenges included conducting construction activities during what turned out to be the wettest December in Marin County in the last 50 years.
The Coastal Salt Marsh at the former Hamilton Army Airfield required remediation to address elevated levels of contaminants by removing contaminated soil from the marsh. Soil was excavated in the outboard marsh from several specific sites ranging in size from a few hundred square feet to several acres and as much as three hundred feet outboard of the bay front levee. Cerrudo Services excavated, stockpiled and disposed 33,208 cubic yards of contaminated soil from a total of 10 separate sites located within the coastal salt marsh tidal zone.
Minimization measures were implemented to protect the salt marsh harvest mouse, the California clapper rail and other fauna and flora from the effects of remedial actions.
Bay water tidal influences into the excavation areas were a major concern. Control measures such as sediment traps and a barrier placed at the downstream end of the drainage ditch were devised to eliminate migration of contaminants into the bay by receding tide water.