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To: Bahadori,Taj< > Cc:Spencer Supinger<Spencer.Supiner@qkinc.com> Subject: Harney Lane Migrant Center Wastewater Improvements Project To: Mr.Taj Bahadori, Senior Engineer, San Joaquin County Public Works Solid Waste Division From: Douglas Parson and Spencer Supinger with QK Inc., Engineers for the Harney Lane Migrant Project. As we have discussed,the Housing Authority of the County of San Joaquin and Villa Real Inc have advertised for bids for a project to make improvements to their onsite wastewater system.At the pre-bid meeting, questions were raised about two possible areas of cooperation with the County Solid Waste Division that would be very helpful to the project. Please see attachment 1, Site Sketch A.The project includes replacing the two pumps for the wastewater lift station, a mag flowmeter, an emergency generator, replacing the three aerators, miscellaneous electrical work, earthwork fill to raise the levees around Lagoon#3 (which is currently 3 feet lower than Lagoons 1 and 4), removing sludge from the bottoms of Lagoons 1,3, and 4 and disposing offsite, and placing rock rip-rap slope protection on the banks of Lagoons 1 and 4.These improvements do not change the way the plant operates or the permitted capacity, but consists mainly of maintenance upgrades.The proposed contract duration is one year since the work on the 3 wastewater lagoons will have to be done one-at-a-time while the other two lagoons are still in service. On behalf of the Housing Authority, and in accordance with your request for a written inquiry,we respectfully request the following two areas of coordination with our project: 1. Project Access: During certain periods of the project, like when some of the wastewater will be trucked offsite or when fill dirt will be imported to raise the levees of lagoon#3,we request to have the trucks utilize the access road on the landfill side of the fence as has been done in the past.The access road and exist truck access gate between Lagoons 1 and 2 are shown on the attached sketch. From a standpoint of safety for the migrant residents and their children during the project, it would be very helpful not to have construction equipment and trucks traversing through the onsite streets and parking areas.There was a similar project in 1999 where the Housing Authority brought in fill to raise the levees on Lagoon 4 and placed rock rip-rap on Lagoon 3.At that time, and on other occasions,the Solid Waste Division has allowed the Housing Authority or their contractors to utilize the access road. 2. Storm Water: Due to limited room onsite to create a temporary sludge drying area,we would like to request to divert the storm water from the site to the drainage ditch east of the access road and temporarily dry up the storm basin to be used as a drying bed during our project.The attached Site Sketch A indicates the storm pump force main pipe and the normal point of discharge into Storm Lagoon 2 at the northwest corner of the Lagoon 2. The sketch also indicates a temporary pipe (dashed line)that would allow the storm water to bypass Lagoon 2 (without coming into contact with any wastewater or sludge).Since the project duration will span over both the wet time of year and dry,the request would be for this bypass to be in place for the duration of the project since the Lagoons 1, 3 and 4 cannot all be worked on at the same time, but sequentially. However, please note that most the of the storm water bypassing will occur during January thru March and then will diminish to very little from April through October.The Housing Authority records indicate that this arrangement was allowed for the above referenced project that took place in 1999 from approximately January through August. In regard to the project Plans and Specifications,they can be viewed or printed from the owner's website at the following link http:/Lvillarealinc.org/procurement.htmi. In regard to correspondence/approvals with the San Joaquin Department of Environmental Health and the Central Valley Regional Water Quality Control Board, most of this was handled by my associate, Spencer Supinger. See attachment 2 which includes 3 pages: a brief summary from Spencer regarding the review process he went through with Rodney Estrada (SJ County Environmental Health) and Dina Calanchini (Central Valley Regional Water Quality Control Board) and copies of two emails from Dina Calanchini. It is our understanding that the Housing Authority and the Solid Waste Division have enjoyed a good working relationship over many years.We are hopeful that this type of cooperation could continue for our current project.We 2