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Project 113-26, Work Plan Page 2 • 4 drill 5 bonngs to oundwater, collect one soil and one water sample per boring RL41� 5 analyze samples for total petroleum hydrocarbons (TPH) as gasoline, and benzene toluene, ethylbenzene and xylenes (BTEX) 6 prepare Quarterly Petroleum Release Reports The work for each sampling event of the quarterly groundwater monitoring will consist of the following tasks 1. measure depth to groundwater -- E�? �j � � •oi•1 2. purge wells and collect 4 groundwater samples 3. analyze samples for Total Petroleum Hydrocarbons (TPH) as gasoline, and Benzene Toluene, Ethylbenzene and Xylenes (BTEX) 4. prepare a written report SITE DESCRIPTION The pro)ect site is located on the northeast corner of the intersection of East Grant Line Road and Holly Street in Tracy, California The site is currently used as a • convenience store facility and retails gasoline under the name Cheaper! #37 SITE BACKGROUND Two gasoline tanks were removed from the property on March 3, 1988 Groundwater was 7 feet below grade surface (BGS) The tank excavation was emptied and water was sampled prior to the new tank installation Three groundwater monitonng wells were installed in April, 1988, and a fourth well in May, 1988 Water sample analysis in May, 1988, showed TPH-g at 140 Rg/L and benzene at 2 7 µg/L Monitoring well sampling was done in September, 1992 Free product (approximately one inch) was found in MW-4, which is by the tanks near the store front MW-2 had a soil blockage at six feet BGS Tph-g was present in MW-1 (220 µg/L), benzene in MW-1 (21 µg/L) and MW-3 (0 7 µg/L), toluene and xylenes in both, and ethylbenzene in MW-1 only Even with the product in MW-4 the groundwater gradient may be to the north at this site Parker Environmental Services, 4185 Rialto Court, Pittsburg, CA 94565-6116 Phone (510) 439-1024 Fax (510) 439-2566