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MaNAGFPS flERS LON$r1A\'[5 slope Excavation without shoring will allow for expanding the size of the excavation and also I permits the inspection and sampling of sfdewalls The sloped sidewall method is recommended for this site to complete the soil removal because it will allow for expansion of the excavation, if necessary, allow for sidewall sampling, and is a less costly method Depending on site conditions it may be necessary to utilize a limited Iamount of shonng in the excavation to protect the integrity of the nearby building and UST 7.2 PREVIOUS EXCAVATION In 1986, petroleum impacted soil was excavated from the beneath the former UST's. The excavation was completed to a maximum depth of 31 ft bgs in the immediate area of the former unleaded gasoline UST. The former excavation was backfilled with clean fill material. This fill will be stockpiled for backfilling the proposed excavation. 7.3 PROPOSED EXCAVATION Prior to beginning soil excavation at the site any required permits, including but not limited to grading permits, will be obtained. All utilities identified in the area will be clearly marked. Any utilities that may be within the excavation will be temporary disconnected Safety is a primary concern during construction activities The edges of the excavation must be properly barricaded or fenced to minimize the potential for accidents It is important that the appropriate sized construction equipment be utilized to ensure safe operations The estimated horizontal extent of petroleum impacted soil is shown in Figure 3 This estimate is based on available analytical results from previous work completed at the site The estimated extent of petroleum impacted soil will be identified on the ground surface prior to excavating This will aid in planning the approach for impacted soil removal. Based on a review of analytical results from soil borings completed at the site, it is estimated that soil beginning at a depth of 31 ft, and continuing to approximately 40 ft bgs will require removal Figure 4 shows a cross section at the former UST area and indicates the estimated extent of impacted soil to be excavated For the purposes of this plan, the extent of impacted soil identified requiring excavation is estimated. The actual extent of soil requiring excavation will be based on FID readings and visual observations LSPROJECPSVS"JOQXLODS ACP 14 15 May 19"