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C A M B R I A <br /> will be collected from boring SB-19 at depths of approximately 40, 50, 60, and 70 fbg for lead <br /> analyses. Soil samples will also be collected from boring SB-20 at the same depths and will <br /> serve as background lead data for comparison to the SB-19 lead results. <br /> Borings SB-20 through SB-28 will be drilled with CPT equipment to a depth of 150 fbg or until <br /> the CPT drilling equipment can advance no further, whichever comes first. The borings will be <br /> logged using the CPT electronic logging technique. The logs will be used to determine, in the <br /> field, the location of coarse-grained zones, which will be targeted for groundwater sample <br /> collection using CPT groundwater sampling equipment. Groundwater samples will be collected <br /> © from all of the CPT boring,except CPT-19. — ;$ 7 <br /> Soil samples will be collected from borings SB-26, SB-27, and SB-28 to evaluate shallow (10 <br /> and 20 fbg) soil conditions beneath the property to the north of the subject site. We do not plan <br /> to collect soil samples from the CPT borings, other than those described above. Lead scavenger <br /> have not been detected in soil samples collected from soil borings previously drilled at the <br /> subject site. Therefore, it is unnecessary to analyze offsite soil samples for lead scavengers. <br /> A Cambria geologist will supervise the drilling activities. The scope of work described in this <br /> work plan will be performed under the supervision of a registered geologist. Soil samples <br /> designated for chemical analyses will be retained in stainless steel or brass sample tubes. The <br /> tubes will be covered on both ends with Teflon sheets and plastic end caps. Soil samples will be <br /> labeled, entered onto a chain-of-custody record, and placed into a cooler with ice for transport to <br /> a State of California certified laboratory for analyses. <br /> Shallow Well Installation: Wells S-5 and S-6 will be drilled with hollow-stem auger drilling <br /> equipment at the locations shown on Figure 2. The well borings will be drilled to approximately <br /> 65 fbg. The wells will be constructed using four-inch diameter Schedule 40 PVC casing. The <br /> wells will be screened from approximately 50 to 65 fbg. The sandpack will be placed from the <br /> bottom of the well screen up to two feet above the top of the well screen, followed by a two-foot <br /> thick bentonite seal, and cement grout to grade. Actual well construction details will be based on <br /> field conditions during drilling. Each well will be secured with a locking cap under a traffic- <br /> rated well box. <br /> Deep Well Installation: Well S-2-85 will be drilled with hollow-stem auger drilling equipment <br /> at the location shown on Figure 2. This well will be installed to monitor groundwater in the deep <br /> zone in the southeastern comer of the site. It is intended to serve as a sentry well between the <br /> source area and the mobile home park well. The well boring will be drilled to approximately 85 <br /> 0797 5 <br />