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REMEDIAL FIELD REPORT -16 AREG MAJOR MART ■ SOIL REMEDIAL PROGRAM ' On Monday, March 8, 1993, the TreaTek-CRA Company (TreaTek) mobilized the crew and equipment necessary to complete the site soil remedial activities as outlined in Sections 3 2 3 and 3 2 4 of the November 13, 1992 "Quarterly Monitoring Report, Third Quarter 1992" The remedial activities conducted at this time consisted of the excavation and disposal of all soils ' containing residual concentrations of Total Petroleum Hydrocarbons as Gasoline (TPH-G) and Benzene, Toluene, Xylene and Ethylbenzene (BTX&E) from the former underground storage ' tank (UST) locations Initial site activities included a site safety meeting and preliminary site preparations The original site preparation plan specified ramping and staging of the area to allow for excavation ' to 40 feet beneath the ground surface (bgs) depth However, the excavation plan was modified by using an oversized excavator, subsequently eliminating the need for ramping and staging During the site preparation activities of March 8, 1993, a small (approximately 150 gallon) UST was encountered in the location shown on Figure C-1. Upon inspection it was discovered that the tank contained a significant quantity of unknown fluid Expedited tank and content removal ' procedures were initiated The tank contents, believed to be cleaning solvents, were removed and transported with the aide of the Jim Thorpe Oil Company for recycling Two soil samples, UT- l E and UTA W were collected from beneath the location of the tank The soil beneath the tank was then removed and stockpiled onsite These samples were analyzed for TPH-G, TPH-D (diesel), BTX&E and Halogenated Volatile Organics via EPA Method 8010 The tank removal and excavation activities were overseen by personnel from the San Joaquin Local Environmental Health Department (EHD) On March 9, 1993, remedial excavation activities commenced using a on-site mobile laboratory ' for sample analysis. Since the tank discovered on March 8, 1993 had not yet been removed, excavation of the remedial area was conducted around the tank Prior to excavating, the on-site stockpiled soils which were sampled in November 1992, were segregated such that only the area ' which had previously exhibited detectable TPH-G concentrations remained in place. The rest of the stockpile was relocated to the northeast corner of the facility The section of the stockpile which previously exhibited detectable TPH-G concentrations was then divided horizontally in ' half and two soil samples (SS -1 and SS -2) were collected from the stockpile (Figure C-1) The tank area excavation began with the removal of the overburden which had been placed in ' the former tank area during the tank removal program This overburden was placed in a stockpile and soil samples SS -3 and SS -4 were collected from this pile ' With the suspected clean overburden removed, the native soil excavation began Soil was removed from the southwest corner of the former tank location in 5 foot depth lifts The first lift was removed with the excavated soil being stockpiled into pile S-2 as shown on Figure C-2 Soil samples SS -5 and SS -6 were collected from this pile and were analyzed by the on-site laboratory Since strong petroleum hydrocarbon odors were present during the removal of the first lift, a second 5 foot lift was removed, lowering the depth of the excavation to 25 feet in the area shown on Figure C-2 with the excavated soil being stockpiled into piles S-3 and S-4 ' S[h\RPT5IAR£GIQTR WP C - 1 05117193