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Lh! `s' ; ! iE; ,'TQL HEALTH Apache T `cf VICE APACHE PLASTICS, L. P. � "14 uu 2050 E . Fremont St. • P .O . Box 5127 • o�k��,�AP952�5.y401cc 27 • 2091466-4356 • 8001527-2243 • FAX 2091466-1730 June 14, 1993 Mrs. Diane Hinson Public Health Services 1601 East Hazelton Avenue Stockton, CA 95201 Subject : Quarterly Monitoring Report Dear Mrs. Hinson: I would like to recount a brief history of our underground storage tank problem and then address what I believe to be a reason able approach to remediation. As you may recall, Western Geologic Resources of San Francisco conducted a subsurface investigation in May and June of 1990 at our manufacturing facility in Stockton. The subsurface investigation was accomplished via seven monitoring wells (of which one was paved over during the Fremont Street widening) . In October of 1991 , Remediation Services of Pleasanton California installed a vapor extraction well and manometer points near the location where the underground gasoline storage tank had been removed. The vapor extraction well was operated until four 220 pound carbon beds were saturated. The four carbon beds became saturated very quickly and it became clear to me that the use of carbon beds was going to be much too expensive as a vapor remediation technique. We then terminated the carbon bed remediation and began a search for a more economical approach. On June 3 , 1993, we had our existing monitoring wells sounded by Don Light of Del Tech Services of Oakdale, California. Our deepest well had a tiny amount of water, and all others were still dry (they were first determined to be dry in June of 1991). Information from the well sounding is shown below: MW Number Well Diameter Well Depth Depth to Water OVM Reading I 2 4" 67.07 No Water 19 PPM 3 2" 64.96 No Water 2 PPM 4 2" 67.60 No Water 3 PPM 5 2" 69. 50 No Water 74 PPM 6 2" 70.05 69.93 3 PPM 7 2" 69.01 No Water 3 PPM k'