SITE INFORMATION AND CORRESPONDENCE

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Mr. Brian Grattidge 0 - 2 - -4 17 May 2001 • Section 3.4.2 describes the intention to land apply treated wastewater to 1,022 acres or more, "if available." If the land is not available, and an NPDES permit is not approved,then the City of Lathrop will not be able to proceed with all the proposed housing. • Table 3-6 provides estimated effluent limits based on the Mountain House WDRs. Effluent limits are based on site specific conditions, and the erlluent limits applied to Mountain House may not be applicable to the City of Lathrop. • Section 4.2.1 describes Waste Discharge Requirements and describes monitoring that would be required. In addition to the items listed, groundwater monitoring will be required at all storage or land application areas. Depending on the Standard Industrial Classification (SIC) code of the final project, compliance with the National Pollutant Discharge Elimination System (NPDES) General Permit No. CAS000001 for Discharges of Storm Water Associated With Industrial Activities may be required. The SIC codes of activities requiring coverage are listed in the General Permit. In order to obtain coverage by the General Permit,the proponent must submit a Notice of Intent to comply with the permit(NOI) to the State Water Resources Control Board and a Storm Water Pollution Prevention Plan (SWPPP) must be prepared. If construction associated with the project will disturb more than five acres or is part of a larger common plan of development that encompasses five or more acres, the property owner needs to obtain permit coverage under the National Pollutant Discharge Elimination System(NPDES) General Permit No. CAS000002 for Discharges of Storn-i Water Associated With Construction Activity. Before construction begins, the proponent must submit an NOI to comply with the permit to the State Water Resources Control Board and a SWPPP must be prepared. If there are any questions about this process or the storm water program, you may call Dani Berchtold at (916) 255-3383 or Leo Sarmiento at (916) 255-3049. Additional information can be found at the Storm Water website - http://Www.swrcb.ca-govlstormwtrlindex.html. If the project will involve the discharge of dredged or fill material into navigable waters or wetlands, a permit pursuant to Section 404 of the Clean Water Act may be needed from the US Army Corps of Engineers. If a Section 404 permit is required by the Corps,the Board will review the permit application to ensure that discharge will not violate water quality standards. For more information, contact the Sacramento District of the Corps of Engineers at (916) 557-5250 or.Matthew Reischman with the Regional Board at(916) 255-3120. If you have any questions on this information,please telephone me at (916) 255-3116. TIMOTH R. O'BRIEN Waste Discharge to Land Unit Lower Sacramento River Watershed cc: Mike Huggins, San Joaquin County Environmental Health Department, Stockton Ramon Batista, City of Lathrop C.Troi aFi1e6\Sit%\M3x.Corr\Sute CleuingMux\GuttidgO5]Wl.doe