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the land will be used for car storage. Engineers for ADT have calculated that the facility would .:._. generate approximately 49,776 gallons of water per day. The conceptual wastewater delivery system,originally outlined in the Special Purpose Plan,would be modified to reflect the site plan for the ADT Auto Auction. The auto auction will use private sanitary sewer lines to serve the entire 204-acre site. Thus, the revised conceptual water system design would be revised so that the public sewer lines end at:the entrance.to the ADT parcel. The - - original alignments of the public loop road and public sanitary sewer lines to serve individual industrial lots would be deleted (Figure 10). Storm Drainage The 1994 Special Purpose Plan contains a conceptual storm drainage collection system which sizes the storm pipes along the loop road in sizes varying from 18 to 48 inches. A temporary detention basin was originally planned for construction during Phase II of the Plan development, when the service commercial uses and light industrial activities are completed adj acent to the Mountain House Parkway/Schulte Road intersection(Figure 11).This temporary detention basin was constructed but has since been abandoned. A larger detention basin was originally planned for constniction in the northern portion of the Tri- State/Cheng parcel near the Patterson Run,to serve later, Phase III development of the site. This larger detention basin has already been constructed by the business park developer and is functioning as of 1999. The two detention basins were originally proposed to be linked with an earthen ditch running parallel to the Delta Mendota Canal. However, an underground permanent storm pipeline has already been constructed in place of the earthen ditch to drain the developed area around the United Facilities building to the permanent Phase III detention basin. The ADT Auto Auction site plan proposes to construct a series of ten-foot vegetative swales that would drain the project parking areas into the detention basin. The natural swale of Patterson Run- and Drainage "A"would drain into Area"C,"a wetlands(Figure 11). A third natural drainage in the northern part of the site(Drainage`V)wouldnotbe modified and would not accommodate any storm waters from the developed project. . mpleted by Kier & Wright in May, 2000. In order to An updated storm drainage study was co maintain the existing peak flows in the drainage swale after the ADT auto auction project has been commends that the size of the existing detention basin be increased from 20 completed, the study re acre-feet(AF)to 54 AF. The most recent study found that only a small portion ofthe auto auction project drains directly into Patterson Run. The project plans show only minor,modifications.to Patterson Run,including construction oftwoboxculverttypebridges. The studystates that the installation ofthebozculveit -- bridges would have only minimal effect on storm flows through Patterson Run, because they`are :.. : =- .designed to not impede fhe 100-year flow. t _ v 93231-BoAppOompil-080