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I , <br /> =C ti y <br /> 1 <br /> Shiningtree <br /> ENVIRONMENTAL SERVICES <br /> P.O. BOX 1875 - MURPHYS, CA 95247-1875 (2Q9) 72$2529 <br /> 4/15/88 <br /> Mr . Tim Smith RG <br /> TKS Consulting <br /> Box 842 <br /> Pine Grove , Ca . 95665 <br /> ~RE: Rocsan Sand & Gravel -Noise .. , <br /> I <br /> bear Tim: <br /> At your request we have prepared estimates of noise1-impacts <br /> associated with the proposed new ROCSAN sand & gravel operation <br /> in San Joaquin County . The proposed operation , located in a <br /> sparsely populated agricultural area , is designed to process 4500 <br /> tons per day of aggregate . The major sources of noise will be <br /> from mobile sources associated with haulage and from the <br /> stationary equipment at the plant site . I� <br /> i <br /> The :,estimated project related noise contours are shown in 3 <br /> exhibits. One showing daytime 55 & 60 dBa LEQ, the second!i1showing <br /> night 55 & 60 dBa LEQ, and the third showing the 65 dBa Ldn <br /> contour . ' <br /> Plant Noise <br /> The plant as proposed will process run of pit sand and <br /> gravel at a rate of 4500 tons per day 24 hours per day . The plant <br /> expects to handle pit -run sand and gravel , 100% of which.11! passes <br /> through a 4" screen . I have inspected the quarry site and have <br /> noted the apparent lack of large cobbles , but for "modeling <br /> purposes we used 90% passing 6" which increases the anticipated <br /> level of processing noise. <br /> S <br /> The site is characterized as a "soft site" , i.e .:, grass <br /> covered fields as opposed to rocky or paved surfaces . We searched <br /> our rock plant in-house database and found 2 similar operations <br /> in this region processing the same approximate tonnages a;nd same <br /> product sizes . The site having the highest noise level was used <br /> in this model . We did not allow for any shielding due to ,barriers <br /> ' or stockpiles which could reduce noise levels below thosel�sshown. <br /> II <br /> i <br /> i <br /> � I <br /> I <br />