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• f M E MORANDUMa CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD - CENTRAL VALLEY REGION 3443 Routier Road, Suite A , -Rhone:(916) 361-5600 Sacramento, CA 95827-3098 ATSS Phone: 8-495-5604 SEP 0 4 TO: ANTONIA K.J. VORSTER FROM: ROBERT EVANS Senior Engineer Area EngineWVi; ,00NM�-iNJAL HEALTH DATE: 30 August 1990 SIGNATURE: SUBJECT: REVIEW OF THE SLUDGE MANAGEMENT (JULY 1990) CITY OF TRACY, SAN JOAQUIN COUNTY (CASE# 0090) On 20 July 1990, we received the City of Tracy (the City) Sludge Management Plan prepared by CH2M-Hill . This Plan presents information to support an application for land treatment of municipal sludge from the City of Tracy Wastewater Treatment Plant (WWTP) . After evaluating other disposal options, the City has decided to reuse the sludge as an soil amendment on City-owned land around New Jerusalem Airport (11 miles southeast of Tracy) . The objectives for the City's Report are 1) to develop and permit a 300 acre site near Tracy, CA for an one-time sludge application, 2) to demonstrate the utility of sludge application to local farmers, and 3) to develop the 300 acre site plus the surrounding 1700 acres (owned by K & L Farms) into a long-term sludge disposal site. maintain this site even after other application site are identified and permitted. The 300 acres of cropland at the New Jerusalem Airport is owned by the City of Tracy and is leased to K & L Farms of Tracy. K & L Farms owns the surrounding 1700 acres such that all 2000 acres are contiguous and managed by a single farming enterprise (see Attachment 1). This land has been evaluated for land treatment of the municipal sludge. The soils, ground water, and farm management program at the site have been described as well as a monitoring program. The sludge in the drying beds and digesters has also been characterized. The results of these investigations and the discussion of the impacts to water quality are presented in the Plan. SOIL CHARACTERISTICS The Report states that an on-site soils investigation for the entire 2000-acre farm was conducted during February 1990 to define the soil conditions at the site and to determine overall site suitability for long-term land application of sludge. Representative soil samples, from the proposed 300-acre sludge application site only, were collected from selected soil profiles for chemical and physical analyses. Results from the soils analyses are shown in Table 2 - Soil Analyses for New Jerusalem Airport of the Report. The Report provided the following observations regarding the laboratory analyses: 1. The soil pH and electrical conductivity (EC) values are typical of soils in the area with the surface soil pH values ranging from 6.5 to 7.2. This show no need for liming the sludge in order to stabilize surface soils at or above pH of 6.5. The EC values, showing accumulation of salts in the lower soil