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195 EAST MORGAN STREET • PERRIS, CALIFORNIA 92370 (714) 943-4014 9 FAX (714) 924-2961 Manufacturers of OSA Relocatable Classrooms Inc. SANiT RY E`iGMEERNG April 3, 1990 4P�: l�,-i9,90 Department of Health Services 714/744 "P" Street Sacramento, CA 95814 - - - - Dear Sirs: Modtech, Inc. has obtained site approval from the city of Lathrop, San Joaquin County and the Lathrop County Water District, to construct a relocatable classroom manufacturing plant on Harlan Road between Roth and Lathrop roads in Lathrop. (Assessors' Parcel No. 195-030-30, Site Approval No. 89-45) Even though we are outside the present boundaries of the Water District, they have approved our site "in principle". However, because the site can not be served by the District, we must request that we be allowed to use the existing well (No. AG 12) for the required fire fighting supply until the public water supply is available. In order to allay any fear that this use might increase the difficulty of the Sharpe ground water clean-up, Modtech will abandon (under permit/inspection) all of the remaining agricultural wells on the property (NOTE: not just the site but the entire property) . This will lead to a major reduction in ground water extraction on this property. The 2,500 GPM pump test required by the fire department is very minor when compared to the irrigation needs of 75 acres of field crops. Further, all of the water discharged will be concentrated at the north east corner of the site (in the flood control basin) so the only real loss to the ground water will be from evaporation. All water for domestic use, including plumbing fixture supply, will be trucked to the plant by a licensed water hauler. The domestic water supply will utilize a 2,000 gallon pressurized tank to insure the required minimum water pressure at all plumbing fixtures (15 PSI per the California Amended Plumbing Code) . Although this is a temporary solution, it will allow Modtech to begin construction, and reduce ground water demands near the Sharpe plume. Although we claim no expertise in the requirements of your agency, we know of no codes or ordinances that preclude this course of action.