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'1 lephone -173-7357 <br />CITY of ORONO <br />}lost Office H(jx 669Crystal Hay, Minnesota 553230Municipal Offices <br />On the North Shure of Lake Minnetonka <br />December 29, 1983 <br />Mr. Dale Zoerb <br />A-1 Quality Construction Company <br />2202 Rockstone Lane <br />Minneapolis, Minnesota 55112 <br />Re: Robert Provo Septic System Repair Proposal <br />Dear Mr. Zoerb: <br />Thank you for submitting the Robert Provo septic system site <br />evaluation and design. The proposal appears to meet Orono code <br />requirements in most respects; the following items should be noted: <br />1) New mound is to be placed over old drainfield. All existing <br />trench drainfield, which extends outside the perimeter of the <br />mound, must be removed or turned over and mixed to eliminate <br />the possibility of seepage from mound area into trenches acting <br />as a conduit to the surface. <br />l) Size of pump chamber must allow 150/gal.BR reserve capacity, not <br />75 gal./BR as designed (Orono code requirement). Based on 5 BR's <br />as proposal indicates, reserve capacity of 750 gallons is required. <br />This normally requires use of a 1000 gallon pump tank. <br />3) The existing tanks are presumably 1000 and 600 gallons respectively, <br />based on information supplied by Widmer Bros., Inc. dated December <br />13, 1969. These tanks will be suitable foi continued use only <br />if they have solid concrete bottoms and are reasonably free from <br />groundwater infiltration. It is impossible for me to make a <br />final determination whether the existing tanks need to be replaced <br />until they are opened up. I suggest that you have the system bid <br />both with and without replacement precast tanks. Note, that <br />minimum tank sizes required are 1000 and 750 gallons respectively <br />(see attached Mound System Construction` flyer). <br />