SITE INFORMATION AND CORRESPONDENCE

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W PUBLIC AEALTH SERA ICES SAN JOAQUIN COUNTY ? ENVIRONMENTAL HEALTH DIVISION Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer ; 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 oq<; FORa`" 209/468-3420 C0 rr STEVE JERKINS MAILED MAR 2 7199E SUPERINTENDENT OF ENGINEERING CRYSTAL CREAMERY AND BUTTER COMPANY PO BOX 1313 SACRAMENTO CA 95086 RE: Crystal Creamery and Butter Company SITE CODE: 2098 404 West Fremont Street Stockton, CA San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) has reviewed the February 2, 1996 Quarterly Status Report submitted by Wallace Kuhl and Associates, Inc. (WKA) for the above referenced site. The report contains results of laboratory analyses which were performed on samples obtained January 2, 1996 from six on site monitoring wells and one off site monitoring well. The report draws no conclusions and makes no recommendations from data obtained to date. The groundwater investigation phase of the Van Buren Street Chase Chevrolet site and the Crystal Creamery site is complete. There is no indication that the Crystal plume and the Chase plume are comingling. Monitoring wells installed for the Chase investigation which are closest to the Crystal site show non detectable concentrations of petroleum hydrocarbons. Chase MW-16 is located southeast of Crystal MW-2 and Chase MW-14 is located at the northeast corner of the intersection of Fremont and Van Buren streets. Chase MW-14 is approximately 80 feet northeast of the Crystal site and 160 feet northeast of Crystal MW4. Chase well MWA4 is located downgradient of the Crystal site and is free of contamination. A well at the southwest corner of the same intersection would be a more appropriate location for determining the downgradient extent of the Crystal plume, however this location is unsuitable due to the presence of underground utilities. The Crystal plume is migrating off site in the direction of MW-3 which is located in Van Buren Street. An increase in contamination in MW-5 indicates that the plume may be migrating off site to the north. MW-1 , closest to the original tank location, which historically has had sheen or free product, shows decreasing concentrations. MW-4 centrally located on the site, north of the original tank excavation, shows increasing concentrations. In letters dated November 9, 1994 and February 3, 1995, PHS/EHD requested a workplan for interim remediation or investigation of soil contamination surrounding the former tank excavation. This residual soil contamination was documented during the January 14, 1987 overexcavation of the former UST location to a depth of 18 feet. The WKA report dated September 2, 1994 states that the excavation was reportedly deepened to a depth of 22 feet. There is no record of this additional overexcavation. The conclusion in the September 2, 1994 WKA report is "gasoline contaminated soils have been detected at a depth of 18 feet beneath the UST and likely extends to groundwater based on floating hydrocarbons observed in MW-1 . " At this time there is no workplan to investigate or remediate this secondary source. A Division of San Joaquin County Health Care Sere ices