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I 10 INTRODUCTION On behalf of the San Joaquin Catholic Cemetery, Ramage Environmental has prepared this Work Plan for regulatory review and approval The proposed scope of work includes the installation of two groundwater monitoring wells and quarterly groundwater monitoring and sampling at the site The work scope has been approved by the San Joaquin County Public Health Services Environmental Health Division (PHSIEHD) and the Underground Storage Tank Cleanup Fund (USTCF) 1 1 Site and Subsurface Description The subject property is an operating cemetery located on the northeast corner of Harding Way and Cemetery Lane in the city of Stockton (San Joaquin County), California (Figure 1) The project site is located on the east-side of the mausoleum building (Figure 2) The site is flat and at an elevation of approximately 16 feet above mean sea level Based on previous drilling at the site, the subsurface soil consists of interbedded clay, silt and sand mixtures to a depth of at least 80 feet bgs Sand intervals encountered during sampling were less than 5 feet thick, laterally discontinuous and consisted primarily of poorly-graded fine-to medium-grained sand Groundwater was last monitored in February 1998 at a depth of approximately 45 feet below ground surface (bgs) Since 1992, groundwater levels have risen approximately 22 feet In general, groundwater flows north-northeast at a gradient of approximately 0 002 foot/foot 12 Previous Work On November 17, 1989, one 500-gallon gasoline UST and one 1,000-gallon gasoline UST were removed from the site in response to a failed tank tightness test A hole approximately 5-inches in diameter and numerous pin-sized holes were observed in the tank bottom Soil directly beneath the removed tanks was saturated with gasoline hydrocarbons On January 30, 1991, WaterWork Corp published Problem Assessment Report for Investigation of Petroleum Hydrocarbon Contamination Their scope of work incl lded the drilling of five soil borings and the installation of one groundwater monitoring well (MW\;)in the center of the former UST excavation Results of the soil and groundwater sampling indicated that groundwater had been impacted by gasoline hydrocarbons but that the majority of the • hydrocarbon mass was concentrated in soil between 10 and 20 feet bgs 2