Fort Walton Beach Ordinance — 1467--Sale of Excess Real Property--S&P Mgt — reading text

that appears to be the result of digging out the two former test bum pits. A 180-foot long by 95-foot wide borrow pit is located immediately northwest of this area. Seven monitoring wells or piezometers were observed in this general area. Discussions with the City of Fort Walton Beach indicate these wells were installed to assess a release of diesel fuel from the fire training area; however, there was no documentation available regarding the well construction details, such as screen intervals, or analytical data. The wells appear to have been installed before 1991 as indicated by their inclusion on a site map drawn by Environmental Protection System and revised on August 6, 1991, to include this data. A former rifle and pistol firing range is located on the west portion of the property. The range was used by the Fort Walton Beach Police Department and was also open to public use, The range is currently inactive. The overall dimensions of the firing range are approximately 330 feet by 300 feet and are encompassed by a sand berm with the exception of the entrance to the southeast. The firing range is subdivided into two firing areas. The southern firing area (South Range) is approximately 160 feet long (east to west) by 110 feet wide (north to south) within the berm walls ranging from 8 to 11 feet in height framing it to the north, south, and west. The east end of this area is open. The primary line of fire within this area appeared to be toward the west berm wall. A monitoring well was observed in the west-central portion of this area. The northern firing area (North Range) is approximately 150 feet long (east to west) by 110 feet wide (north to south) within berm walls approximately 17 feet tall to the east, north, and west. The primary line of fire within this area appeared to be toward the north berm wall with minor fire toward the west wall. Two monitoring wells were observed in the north-central portion of this area. The purpose of these wells was not known to the City of Fort Walton Beach. Based on a land survey conducted at the site at the same time as this investigation the western half of the shooting area will not be within the area to be purchased by S&P Management of Florida, LLC. 2,0 SCOPE OF WORK The executed scope of work consisted of the following: 24 Phase Il ESA (Impact Verification) e Exploration and delineation of potential soil and groundwater impact from petroleum hydrocarbons in the vicinity of the fire test site using push-tool technology (Geoprobe™). Soil samples in this area were collected at 4-foot intervals to the depth of groundwater. Soil samples from each interval were field screened using a photoionization detector (PID). 10/17/01, Phase I and Phase 111, Fort Walton Beach Pistol Range, Project No. 231201-ESAL Mr, Pat James October 17, 2001 Page 3 ° Soil samples from each boring exhibiting the highest PID reading were submitted for laboratory analysis. e Soil borings with soil samples that exhibit elevated PID readings at the watertable were converted to temporary monitoring wells, if not in close proximity to nearby existing monitoring wells, to accommodate groundwater sample collection. © Soil and groundwater samples collected to assess the fire test site were analyzed for the Florida Kerosene Group. e Existing monitoring wells in this study area were inspected for serviceability. Serviceable wells were purged of a minimum of 5 well volumes and sampled after purging. All seven wells in this area (MW-1 through MW-S, and P-4 and P-5) were found to be serviceable. « Purge water from the monitoring wells is temporarily being stored on site in 55-gallon drums. Disposal of purge water will depend on laboratory results of the purged wells and will constitute a change in scope once determined. 22 Phase Ill Investigation (Impact Quantification for Remediation) e Demarcation of the firing range area into cells. © Collection of soil samples at 2-foot intervals to the depth of groundwater within each cell along the base of the down-range berm walls using push-tool technology (Geoprobe™). e Collection of soil samples at 1-foot intervals to the maximum depth of 4 feet (perpendicular to berm face) within each cell on the down-range berm walls using hand augers. e Collection of soil samples by the same methods but at reduced frequency as needed with distance removed from the down-range berm walls. e On-site sieve analysis of selected soil samples to enable an estimated total mass of bullet fragments greater than sand size. e Analysis of an estimated 60 soil samples for total Lead per Environmental Protection Agency (EPA) Method 239.2. Background samples were also collected for lead analysis from remote locations on the property. © Installation of eight, 1-inch diameter, PVC monitoring wells in the firing range area using Geoprobe™, One well was installed immediately exterior to the north, east, south, and west of the berms, Two wells were installed within the North Range area, one well was installed in the South Range area, and one well was installed 10/17/01, Phase Il and Phase III, Fort Walton Beach Pistol Range, Project No. 231201-ESAII Mr. Pat James October 17, 2001 Page 4 approximately 200 feet south, or upgradient of the range to serve as a background sampling location. The wells were installed so that at least 3 feet of screen was below the watertable interface. e Existing monitoring wells in this ‘study area were inspected for serviceability. Serviceable wells were purged of a minimum of five well volumes and sampled after purging. The two wells located within the North Range were found to have been filled with bentonite and were no longer usable. The one well located within the South Range was found to be serviceable and was assigned the identification number of MW- 6. e Following installation the new monitoring wells were developed until they were noticeably clear of fines. The wells were then allowed to stabilize for a period of two days prior to sampling. Sampling was performed using low-flow sampling techniques (.¢., peristaltic pump). The groundwater samples were analyzed for total Lead. * The scope of work was subject to change based on conditions encountered in the field. No change in scope was initiated without prior approval from Mr. Pat James, One scope change approved by Mr. James was the analysis of selected soil samples for Lead per the Toxicity Characteristic Leaching Procedure (TCLP). 3.0 FINDINGS 3.1 Former Fire Training Area A total of eight soil borings (PB-9 through PB-16) were conducted in the former Fire Training Area. These borings were placed around the periphery of the former burn pit and the AST. All benzene, toluene, ethylbenzene, and total xylenes (BTEX) and polynuclear aromatic hydrocarbon (PAH) parameters were reported to be below detection limits (BDL). Total Recoverable Petroleum Hydrocarbon (TRPH) concentrations ranged from 2.42 to 15.1 parts per million (ppm). The most stringent Florida Soil Target Cleanup Level (SCTL) for TRPH in soil is 340 ppm. In the absence of any obvious soil impact in the field, groundwater samples were only. collected from the existing monitoring wells in this study area. The majority of these wells are in close proximity to the expected source areas. With the exception of toluene (0.097 ppm) at MW-1 and TRPH (0.608 ppm) at MW-4, there were no parameters reported above detection limits. The most stringent Florida Groundwater Target Cleanup Levels (GCTL) for toluene and TRPH in groundwater are 70 and 5,000 ppm, respectively. A summary of the soil and groundwater analytical results from the former fire training area assessment are presented in Tables A-1 and A-2, respectively, in Attachment A. The soil and groundwater sampling location are shown in draft Figure 3, located in Attachment B. 10/17/01, Phase If and Phase III, Fort Walton Beach Pistol Range, Project No. 231201-ESAU Mr, Pat James October 17, 2001 Page 5 3.2 Shooting Range The west berm wall of the South Range provided an exposed face of approximately 20 feet high and 110 feet wide to shooters. This berm wall was demarcated into approximately 10 feet by 10 feet cells with 11 vertical columns (A through K) from south to north and two rows (1 and 2) with Row 1 at the top. In general, the majority of the spent bullets were observed in Row 2 (i.e. the bottom 10 feet of the wall). Sieve analysis revealed solid lead greater than sand size (i.e. > No. 10 Sieve size) to range from 1.0 to 5.0 percent by weight in Row 1 and from 7.3 to 86.0 percent by weight in Row 2. The six surficial soil samples with the highest lead by weight results (all in Row 2)-were selected for total lead analysis. This analysis was performed on the portion of the sample that passed through the No. 10 sieve. An additional sample was also collected for analysis from a depth of 2.0 feet below each surficial sample. Total lead concentrations in the surficial soil samples ranged from 56 to 7,674 ppm. Four of these samples were above the clean-up level of 400 ppm for total lead specified by the Florida Department of Environmental Protection (FDEP). TCLP analysis was performed on two of these samples. The resulting TCLP concentrations were 28.5 ppm and 49.9 ppm, which are both above the hazardous waste threshold of 5.0 ppm. Total lead concentrations on the soil samples collected at 2.0 feet below grade ranged from 1.09 to 21.2 ppm. Since the berms of the North Range were larger and more irregular in profile, cells along the west and north berm walls of the North Range were 20 feet wide and varied in height. The west berm ascended steeply from ground level (approximately 14 exposed feet to shooters making up Row 3), was essentially flat in the middle (approximately 10 feet wide with minimal exposure to shooters making up Row 2), and steeply ascended steeply again to the top of the berm (approximately 12 exposed feet making up Row 1). In general, the amount of observable spent bullets on the west berm, were low compared to the north wall with the majority observed in Row 3. The west wall is represented by columns L through P. Sieve analysis revealed solid lead greater than sand size to range from 0.0 to 9.1 percent by weight in Row 1, 0.0 to 9.3 percent in Row 2, and 0.0 to 7.0 percent in Row 3, The highest lead by weight results were all reported in Column P (near juncture with north wall). The north berm generally consisted of a low-rising slope at the bottom (averaging 22 feet making up Row 3), a narrow embankment near eye level (approximately 11 feet making up Row 2), and a uniform slope to the top (averaging 21 feet making up Row 1). Although most appeared to be present in Row 2, spent bullets were observed at relatively high concentrations from place to place within all three rows of the north berm. The spent bullets in Rows 1 and 2 appear to be surficial. Soils within Row 3 appeared to be a product of slumping from above, thus spent bullets may be at depths up to 4 feet below grade within this row. The north wall is represented by columns Q through Z. Sieve analysis revealed solid lead greater than sand size to range from 0.8 to 41 percent by weight. 10/17/01, Phase and Phase Il, Fort Walton Beach Pistol Range, Project No. 231201-ESAI ‘Mr, Pat James October 17, 2001 Page 6 Soil samples were selected for total lead analysis from all three rows of the four columns with the highest lead by weight results (including Column P). Total lead concentrations in the surficial soil samples ranged from 38 to 7,136 ppm. Eight of the 12 samples were above the clean-up level of 400 ppm total lead. TCLP analysis was performed on four surficial samples with the highest total lead results. The resulting TCLP concentrations were 52.0 ppm, 60.1 ppm, 48.0 ppm, and 0.022 ppm. Total lead concentrations on the soil samples collected at 2.0 feet below grade of the same cells ranged from 4,22 to 26,230 ppm. The TCLP concentrations on four samples