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QUARTERLY REPORT April 1996 Lockeford Beacon 13975 East Highway 88 Lockeford, California 1.0. 1[14TROIDUC ION In accordance with a request from Mr Robert Phillips of Lockeford Beacon, Advanced GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report summarizing field activities performed during the second quarter of 1996 at 13975 East Highway 88, Lockeford, California The site location is illustrated on Figure 1 -Location Map A plan of the site is illustrated on Figure 2 - Site Plan Quarterly ground water monitoring was performed on 04 April 1996 in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) and San Joaquin County Public Health Services -Environmental Health Division (PHS-EHD)guidelines for the investigation of underground storage tank (UST) sites 2.0. BACKGROUND 21 SITE DESCRIPTION The site is located in Lockeford, California, a small rural community in northern San Joaquin County at the west corner of the intersection of State Highway 88 and Cherry Street (Figure 1) The site is currently operated as Lockeford Beacon, a gasoline station The property is occupied by a single building and two filling islands Four USTs are presently located on the northern portion of the property (Figure 2) According to an assessment report by Applied GeoSystems (AGS) of Sacramento, two dry wells (French drains)were formerly located on the property These wells provided drainage for run-off and wash-down from the product dispenser area It was reported by AGS that the dry wells were destroyed in July 1987 22 SOIL BORING AND MONITORING WELL INSTALLATION Four ground water monitoring wells (MW-I through MW-4) were installed by AGS in June of 1987 to investigate soil and ground water integrity Total volatile hydrocarbons (TVH) were detected in soil samples from MW-2 at concentrations as high as 50 51 parts per million Less than 1 ppm TVH were detected in soil samples from MW-I and MW-3