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• Operating Procedures that governed the monitor and remediation well installation activities —Soil ' Borehole Drilling, Well Installation, Soil Sampling, and Field Soil Vapor Monitoring 51 Groundwater Monitor Well installation ATC supervised the drilling and installation of five groundwater momtor wells MW -13 through MW -17 Figure 4, Site Plan with Geologic Cross -Section Lines illustrates the locations of each groundwater monitor well Following completion of well borings MW -13 through MW -17, the borings were completed as groundwater monitor wells The construction of MW -13 through MW -17 consisted of 40 feet (surface to 40 feet bgs) of blank 2 -inch diameter, Schedule 40 Polyvinyl Chloride (PVC) casing, and 25 feet of slotted (0 020 -inch slots) 2 -inch diameter Schedule 40 PVC well screen All well casing and screen was delivered to the site in factory - sealed containers Monitor well construction details are summarized in Table 2 5.2 Dual Completion Vapor Extraction/Air Sparge Well Installation Remediation wells were strategically located in areas of known TPHg impacted -soil and groundwater, and ' geometrically fundamental locations for the purpose of conducting vapor extraction, and air sparge feasibility studies The location of each remediation well is illustrated on Figure 4 Well construction IL 4r,. illustrated on Figure 5, Remeai,. wq- W(-1 and_VEAS-3) { onsf lic is Di -t-1 and Figure 6, Remediation Well (VEAS-2) Construction Detail, and summarized in Table 2 Following completion of borings VEAS-1, VEAS-2, and VEAS-3 the borings were completed as dual completion vapor extraction/air sparge wells The VEAS-1 through VEAS-3 well borings were drilled to approximately 65 feet bgs The vapor extraction portion of the wells were constructed of a 4 -inch ' diameter schedule 40 PVC casing The vapor extraction portion of VEAS-1 and VEAS-3 were screened from 15 to 50 feet bgs, and the vapor extraction portion of VEAS-2 was screened from 10 to 50 feet bgs, ' all with 0 020 -inch factory slots The air sparge portion of the wells were constructed of 63 feet of 1-1nch Schedule 80 PVC with stainless steel air sparge points, screened with 0 020 -inch factory slots from 63 to 65 feet bgs All well casing and screen were delivered to the site in new, factory -sealed packaging 5 3 Groundwater Extraction Well Installation Following completion of well boring EX -1, the boring was completed as groundwater extraction well The construction of EX -1 consists of 40 feet (surface to 40 feet bgs) of blank 6 -inch diameter, stainless steel casing, and 30 feet of slotted (0 010 -inch slots) 6 -inch diameter Schedule 40 PVC well screen All well casing and screen was delivered to the site new, in factory -sealed containers The location of EX -1 is illustrated on Figure 4 Well construction details are illustrated on Figure 7, Groundwater Extraction Well (EX -1) Construction Detail, and summarized in Table 2 S 100966 CAP S 1EZ 5eryervelEZ 1009661Reports1140966CAP 6 ATC Associates Inc ATC Project No 43 25827 0026