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Working To Restore Nature 42501 Albrae Street Fremont, CA 94538 Phone: (510) 440-3300 FAX: (510) 651-2233 November 20, 1992 Project No. F7132.32 ! r Sto Quik Markets,Inc. 4567 Enterprise Street Fremont, CA 94538 Attention: Mr.Jack Griffith Subject: September 1992 Quarterly Groundwater Sampling and Analysis Quik Stop Market No. 132, 3555 West Hammer Lane, Stockton, California Dear W.Griffith: RESNA Industries Inc., is pleased to present this report of the results of the September 1992 quarterly groundwater sampling and analyses conducted at the subject site in Stockton, San Joaquin County, California (Plate 1). The site plan (Plate 2) shows the current location of the station building, adjacent streets, monitoring wells, and other-site-specific features. Background information on the site is included in Appendix A. The monitoring wells are sampled quarterly to monitor the shallow groundwater underlying the site. The program objectives are listed below: • Measure depth of groundwater • Plot groundwater contour surface within the site boundaries • Sample and analyze groundwater samples • Compare current and past data The existence and degree of petroleum hydrocarbons in the groundwater underlying the site is determined by (1) the presence of free-floating product, and (2) laboratory analyses of groundwater samples to determine concentrations of total petroleum hydrocarbons as gasoline (TPHG), as well as benzene,toluene, ethylbenzene,and total xylenes (BTEX). Groundwater Sampling Groundwater samples were collected from the five monitoring wells on site in accordance with RESNA's groundwater sampling protocol (Appendix B). Groundwater purged from the wells and equipment decontamination water was placed in drums approved by the Department of j Transportation for this purpose and left on-site pending removal by a licensed hauler. The volume of groundwater removed from each well is noted on the groundwater sampling field log included in Appendix C.