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Quarterly Report - 152 East 11th Street, Tracy Page 2 • INTRODUCTION This report contains the results of groundwater sampling performed at 152 East Eleventh Street, Tracy, California on January 20th 1992 A summary of the current status of investigations into the extent to which the site has been affected by loss of hydrocarbons into the subsurface is also included SITE LOCATION The subject property is situated at No 152 East 11th Street, Tracy. California This location is shown on Figure 1 GROUNDWATER MONITORING Monitoring Wells In March 1988, Four groundwater monitoring well were installed on the subject property by WaterWork of Sacramento, California The locations of these wells are shown on Figure 2 where they are identified as NAV 1 through NAV 4 The Figure also shows the locations of other wells that have been installed to investigate groundwater conditions at 153 East Eleventh Street The latter site is located directly to the north and across the street from the subject property and is occupied by a Beacon filling station owned by Ultramar Inc of Hanford, California Groundwater Sampling and Analysis "On January 20th 1993 the depth to groundwater was measured in each of the four groundwater monitoring wells on the site From these data, groundwater elevations were computed relative to an arbitrary datum of 50 00 ft that was established by WaterWork on the wellhead of Ultramar's Monrtonng Well No 7 which is located in the sidewalk of North F Street on the east side of the Ultramar property at 153 East 11th Street (See Figure 2) The groundwater elevation data is shown in Table 1 and groundwater elevation contours interpreted therefrom are shown on Figure 3 The groundwater gradient beneath / the 152 East 11th Street property is computed to be approximately 0 005 fl/fl to the north- ✓ northeast Also on January 20th 1993, each of the four monitoring wells on the subject property was purged and sampled Prior to sampling, each of the wells was equipped with a dedicated banter The purge water was decanted into a 50 gallon drum The closed drum has been stored on-site in a secured location The samples recovered from the wells were decanted into clean glassware, labeled and entered into chain-of-custody control prior to transport within three hours of recovery to Chromalab Inc 's laboratory in San Ramon, California