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ERM-West, Inc 1777 Botelho Drive , 29 December 1993 l`f'1' 1; ; 1 i C kv�260 ��_+�, „ 144 t Creek, CA 94596 (510)946-0455 9 C,F'o 3 1 P,71 2: 519 946-9968(Fax) Mr Terry Schull San Joaquin Valley Unified Air Pollution Control District 4230 Kiernan Avenue, #130 Modesto, CA 95356 Subject Soil Aeration Project at 1325 & 1515 ERM W Weber Avenue, Stockton, California Dear Mr Schull On behalf of Catellus Development Corporation, ERM West Inc (ERM) is writing this letter to convey the information on daily aeration log and sampling results, per your permit requirement, for the petroleum hydrocarbon impacted soil at the subject facility The soil excavation and onsite stockpiling was completed on 25 October 1993, the soil aeration began on the same day The aeration pile was covered with 6 mil polyethylene sheeting at all times, except when adding or removing soil The aeration pile was secured with a padlocked fence when the site was unattended The soil excavated from 1515 W Weber Avenue (referred to as Site 1) was an estimated volume of 444 cubic yards and the soil excavated from 1325 W Weber Avenue (referred to as Site 2) was an estimated volume of 1467 cubic yards The approximate dimensions of the soil aeration pile are shown in Figure 1 A John Deere 75HP tractor with disc-tilling attachment was used to aerate the soil for a total of 16 days The rate of soil tilling for Site 1 and Site 2 was, 60 cubic yards per day and 600 cubic yards per day, respectively Table-1 below shows the specific dates on which soil aeration by tilling was undertaken at the site The soil aeration task was shared by ERM and by Sunriver Engineering of Brentwood, California from 25 October 1993 to 15 November 1993 A Member of the Environmental Resources Management Group