SITE INFORMATION AND CORRESPONDENCE

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MEMORANDUM , CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD - CENTRAL VALLEY REGION 3443 Routier Road, Suite A Phone: (916) 361-5600 Sacramento, CA 95827-3098 ATSS Phone: 8-495-5600 TO: Antonia Vorster FROM: Michael Higgins Senior Engineer Associate Engineer DATE: 1 October 1991 SIGNATURE: SUBJECT: (MOUND WATER MONITORING WELL ABANDONMENT, BROOKSIDE DEVELOPMENT SITE, STOCKTON, SAN JOAQUIN COUNTY In a 23 July 1991 letter, Kevin Huber of Grupe Development Company requested Board approval to abandon sever al ground water monitoring wells (MWs) at the [Brookside Development Property in Stockton. The request was based on the lack of ground water pollution detected by MW sampling and analysis for total petroleum hydrocarbons and benzene-toluene-xylene-ethylbenzene. I have reviewed the following documents: • Grupe's 6 March 1991 letter and Levine-Fricke's 13 December 1990 letter; • The 12 December 1990 Report of Further Soil and Ground-Water Investigations Conducted During August and November 1990; Area 1 of the Brookside Development; • The 24 July 1991 Quarterly Ground-Water Monitoring Report for the Period February through April 1990 in Area 1 and the Ripkin Property; • The 30 May 1990 Quarterly Ground-Water Monitoring Report for the Period February 1990 through April 1990 in Area 3; • The 27 September 1989 Excavation of Diesel-Affected Soils, Brookside Property, Area 3; • The 23 March 1989 Environmental Site Assessment Report, Ripkin Development Site. The site investigation report and ground water monitoring reports reveal the following: 1. The latest of two samplings of four ground water monitoring wells in proximity to the two former underground tank sites (Area 1) detected no fuel components. The polluted soil was excavated from the tank sites and removed for treatment and disposal . Since the wells are either downgradient or very near the former sites, the analytical results indicate that the tank sites no longer threaten to degrade ground water quality. 2. Two samplings of the MW installed within 15 feet of the reported former location of an underground gasoline storage tank detected no gasoline components (Ripkin property) . The monitoring results indicate that the former tank site is not polluting the underlying ground water. 3. Sampling and analysis of the MW near the former milk barn location and former barrel storage area detected no fuel components.