ARCHIVED REPORTS_XR0008778 - Laserfiche WebLink

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A �� • Working To Restore Nature 1710 Main Street '- ! ' Escalon, CA 95320 > Phone (209) 838-3507 FAX (209) 838-3509 ��FAtL T1A 14�'.;�il,i �1 r_,," i�',i� January 14, 1993 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 Dear Ms Meays • This letter report details Fourth Quarter 1992 groundwater monitoring and sampling activities performed at the above referenced site (Figure 1) On December 8, 1992, RESNA Industries personnel monitored groundwater levels from wells MW I, MW2, MW3, and MW4 Water level measurements (Table 1) were collected from each monitoring well using a Solinst Water Level Meter (Model 101) Water levels have decreased an average of 0 37 feet since September 1992 A groundwater gradient map was prepared using data from the December 8, 1992 monitoring event (Figure 2) Groundwater beneath the site flows toward the east The gradient vanes from approximately 0 004 to 0 039 (21 ft/mile to 206 ft/mile, respectively) Groundwater samples were collected from wells MW1 and MW4 Prior to sampling, a minimum of 29 gallons of water (minimum 5 casing volumes) was purged from each well Conductivity, pH, and temperature were monitored during purging and allowed to stabilize before sampling Field purge logs are included in Attachment 1 Groundwater samples were collected using dedicated, disposable bailers The samples were placed on ice and transported under chain-of-custody to state-certified RESNA Environmental Laboratories in Fremont, California All samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX), total petroleum hydrocarbons as gasoline (TPHG), and total petroleum hydrocarbons as diesel (TPHD) using appropriate EPA methodologies All purged water was contained in labeled DOT approved drums and left on site pending laboratory analyses QMR 0193 FNL