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ANVAPS Working to Restore Nature 1710 Main Street F E B 1 9 1992 Escalon, CA 95320 Phone (209) 838-3507 ENVIRONMENTAL HEALTH FAX (209)838-3509 PERMIT/SERVICES January 17, 1992 Ms Mary Meays San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, CA 95201 RE Marital Deduction Trust 601 South Ventura, Stockton, California PHS/EHD Site Code 1275 40 Dear Ms Meays This letter report details Fourth Quarter 1991 activities performed at the above referenced site (Figure 1) This work is requested by the San Joaquin County Public Health Services Environmental Health Division On November 7, 1991, RESNA Industries personnel monitored groundwater depths and collected groundwater samples from each monitoring well, MW1, MW2, and MW3 (Attachment 1) Water level measurements were collected from each monitoring well using a Solinst Water Level Meter (Model 101) Water levels have decreased from 127 to 1 02 feet since last quarter monitoring in August 1991 (Table 1) A groundwater gradient map was created using data from November 7, 1991 (Figure 2) The gradient is approximately 0 032 feet/feet or 170 feet/mile in a east-southeast direction Prior to sampling, 3 to 5 well volumes of water were purged from each well The samples were collected using a dedicated, disposable Teflon bailer The samples were submitted to state- certified Applied Analytical Environmental Laboratories in Fremont, California All samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX) using EPA Method 8020/602, and for total petroleum hydrocarbons as gasoline (TPHG) using modified EPA Method 8015 Monitoring well MW I was inadvertently analyzed for BTEX and TPHG only All purged water was containerized in DOT approved drums and left on site pending laboratory analyses • LR010792 MD