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I Iq 'y June 15, 1993 l:faf:i' S ''`'l-- tEAC01 C, w J1:�i PM 42�' Sciences L7agiracering Analysis Corporation Ms. Mary Meays San Joaquin County Public Health Services Environmental Health Division 445 North San Joaquin Street Stockton, California 95201 STATUS REPORT FOR 429 WEST LOCKEFORD STREET, LODI, CALIFORNIA, SITE # 1354 Dear Ms. Meays: On behalf of Mr. Mardee Kidd, Science & Engineering Analysis Corporation (SEACOR) is pleased to submit this status report summarizing activities recently conducted at the above-referenced site and activities anticipated to occur during the next quarter. As recommended in our February 22, 1993 report, SEACOR sounded the three existing groundwater monitoring wells in March and June 1993 and collected groundwater samples for chemical analysis in June 1993. The details and findings of these activities is provided below. GROUNDWATER MONITORING On March 3 and June 3, 1993, SEACOR measured the depth to groundwater in the three existing groundwater monitoring wells (MW-IA, MW-2, and MW-3) using an electronic water level indicator. § Depth to groundwater in March 1993 ranged from 43.50 feet to 44.40 feet below ground surface (bgs) and in June 1993 from 41.87 feet to 42.75 feet bgs. Depth to water and corresponding groundwater n elevations recorded in March and June 1993, as well as historical groundwater elevation data are shown i in the attached Table 1. Groundwater elevations measured in March and June 1993 were used to construct the groundwater elevation contour maps included as attached Figures 1 and 2, respectively. Interpretation and comparison of the contour maps indicate that groundwater flow is towards the southeast under a hydraulic gradient of approximately 0.008 feet per foot (ft/ft) in both March and June 1993. The groundwater flow direction and gradient measured in March and June 1993 is also consistent with data collected in January 1993. On the basis of water level data collected in January, March and June 1993, the direction and gradient of groundwater flow does not appear to vary significantly in response to seasonal changes in recharge and discharge. GROUNDWATER SAMPLING AND ANALYSIS Groundwater samples were collected from the three monitoring wells on June 3, 1993. Groundwater sampling was conducted in accordance with the procedures described in SEACOR's technical report dated February 22, 1993. A copy of the Water Sample Field Data Sheets are attached. Groundwater samples were submitted to Superior Precision Analytical Inc. (Superior)of Martinez, California and analyzed for total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, ethylbenzene, and xylenes (BTEX) in accordance with EPA method 8015, modified and 8020, respectively. The results of the current sampling event as well as historical groundwater quality data are presented in the attached Table 50014-OOI-05 MK01 90NewMontgomery Street,Suite 620, San Francisco, CA 94105-45Q3 (415)882-1548Ph (415)882-4406 Pax