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i <br /> KLFINFELDER <br /> measure total ionizable compounds in parts per million by voiume pin v) relative to a <br /> calibration standard. - <br /> Each sample was screened in the field,and the OVA readings were recorded on the boring <br /> log. OVA readings ranged from 0 to greater than 1000 ppmv. 11ie highest readings were <br /> encountered in boring B-10/MW-1 near the ground water surface. A summary of the OVA <br /> readings, soil LithoIogy, and depth in <br /> readings is presented in Table 1. Based on the OVA <br /> the oor-hole, soil samples 67511 and 67521, collected at 31 feet from B-10 and B-11, <br /> antitative analysis <br /> respectively, were selected for quof purgeable TPH and BTEX. <br /> Additionally, three.sail samples 67510,67519, and 67535 were submitted for pertneabili��r <br /> Youn ahl and Associates,in El Dorado Hills,California. <br /> analysis,.ts bY F <br /> Y <br /> For she prctaction of the field crew,the OVA was also rased to measure the total ionizable <br /> ^.cnce.ntration in the breathing zone prior to and during the drilling of the borings. No <br /> consistent readings were noted in the breathing zone while dsi„'ng borings B-i0 through <br /> g_12, Nigh OVA. readings were measured directly over the boring; however, windy <br /> conditions quiclay dissiy�ated the volatile organics aw,y from the breathing zone. <br /> -. 3.3 MONITORING WELL INSTALLATION <br /> E , Upon ccrnpletion of the drilling, soil borings B-10 through B-12 were converted into i <br /> Monitoring wells MW-1 through MW-3, respectively(Plates 2 and 3). Table 2 summarizes j <br /> t!,e monitoring well construction details for the three monitoring wells which are also <br /> illustrated in :he boring logs (App <br /> endix A). installation and construction details, and F <br /> 'decortarnination procAures are presented in Kleinfelde.r's field procedures(Appendix B). <br /> 3.4 MONITORING WELL DEVELOPMENT AND SAMPLING <br /> wH <br /> monitoring wells MW-., MW-2, and MW-3) were <br /> 'On February 21, 1991, the three <br /> deveh�ped to remove sediment.laden water from the well,set the filter Lack, and increase <br /> the effective hydraulic radius of the well. The well development and sampelogprocedures <br /> ment Pure <br /> are explained in Appendix B, Kleinfelder Field Procedures. The well development 8 <br /> Characterization Logs are contained in Appendix D. <br /> `- After the monitoring,wells were developed, they were allowed to equilibriate for <br /> . >`J approximately 48 hours. On February 21, 1991, monitoring wells MW-1,MW-2,and MW-3 <br /> F18.91-62 5 <br /> copyright 1991 y1einfelder, Inc, <br />