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0 L KENNETH D. SCHMIDT AND ASSOCIATES GROUNDWATER QUALITY CONSULTANTS 11 11 FULTON MALL. SUITE 306 FRESNO. CALIFORNIA 93721 TELEPHONE (209) 2684741 April 10, 1986 Mr. Harold F. Grinde Director of Energy and Environmental Affairs Holly Sugar Corporation P. 0. Box 1052 Colorado Springs, Colorado 80901 Re: Tracy Factory Dear Harold: I have reviewed the information on the two gasoline tanks at the Tracy Factory. As you are aware, we previously performed a preliminary groundwater investigation in the vicinity, including a well inventory within one-half mile of the factory. This was done to collect background information necessary for proposing a groundwater monitoring program relative to the wastewater ponds at the factory. In addition, I have reviewed the geologic logs for 22 soils borings at the facility, most of which were done in 1966. Thirteen of these borings were at least about 100 feet deep. The uppermost deposits at the factory are normally fine- grained, with abundant clay, and of low permeability. The shallowest permeable deposits are normally penetrated at a depth of from 15 to 30 feet below the ground surface. Highly permeable, fine to medium sand is usually present below these depths. In October 1966, water levels in the soils borings normally ranged from 6 to 10 feet beneath the factory, and the direction of groundwater flow was apparently to the south, away from the Old River and the Sugar Cut Slough. The direction of groundwater flow in the shallowest permeable strata is probably highly related to the level of surface water in the Old River and the Sugar Cut Slough. There are three supply wells at the factory, and all have surface seals of 60 feet or greater in length. Drillers logs are available for all of these wells. The South Well is located about 600 feet northeast of the unleaded tank site, and 400 feet southwest of the leaded tank site. This well is perforated from 60 to 348 feet in depth. The West Well is about 800 feet north of the unleaded tank site and 550 feet west of the leaded tank site. This well is perforated from 80 to 220 feet in depth. The North Well is located about 800 feet north of the leaded tank site, and is perforated from 107 to 410 feet in depth.