SITE INFORMATION AND CORRESPONDENCE_1988-1991

Home Browse Search

i STATE OF CAUR_TWLA GEORGE DEUKMEJIAN.Governor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— CENTRAL VALLEY REGION 3443 ROUTIER ROAD _ SACRAMENTO,CA 95827-3098 13 December 1989 ' c. .. ° CC + DEC 1 8 1989 ENVIRONMENTAL HEALTH Ms. Wylla Satterness PERMIT/SE VICES San Joaquin County Planning Department 1810 East Hazelton Stockton, CA 95205 COUNTRY SQUIRE ENVIRONMENTAL IMPACT REPORT, LATHROP-SHARPE ARMY DEPOT, SAN JOAQUIN COUNTY This letter conveys our comments regarding a proposed General Plan change as described in the "Environmental Impact Report, Verner-Lathrop Area, General Plan Amendment, Country Squire" , dated July 1989. Sharpe Army Depot, which is contiguous to the eastern boundary of the Country Squire project, has also submitted comments via a letter dated 21 November 1989. We discussed these comments with the County, the State Department of Health Services (DHS) , Sharpe, and the developer, John Verner, at a meeting held on 30 November at your offices. As discussed at the meeting, Sharpe Army Depot has been conducting a remedial investigation to define the extent of groundwater contamination due to volatile organics both on and off their site. This investigation is still ongoing, although it is nearing completion. To date, a number of contamination plumes have been identified which extend off the Depot to the northwest. Contamination levels are such that it is expected that remediation will be required, most probably consisting of groundwater extraction and treatment. Two of these plumes extend beneath the proposed Country Squire development. The plumes were generally delineated, based on existing monitoring well data, in Sharpe's 21 November letter. The exact plume extent, however, is still not known and will require additional monitoring wells. Thus, Sharpe must continue to have access to these two off-site areas to sample existing monitoring wells, install additional monitoring wells, and potentially install and operate future extraction and/or injection wells. Unfortunately, since the investigation is not complete and remedial actions cannot yet be designed, the definite locations of these wells cannot be determined at this time. Based on the above, the Regional Board objects to any changes in the use of the subject property in the two general plume areas (shown on Sharpe's 21 November letter) that may restrict access and prevent delineation and cleanup of the contaminated groundwater. Access includes the ability to locate wells where needed; room for drilling (two to three large, dual-axle trucks and equipment) ; long-term sampling (one pickup size truck) and maintenance (medium sized flat- bed type truck) of wells; and long-term right-of-ways for installation and maintenance of water and electrical lines.