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r <br /> • Mr Ron Rowe <br /> February 9,2000 <br /> • <br /> Drilling Method MW-4A and MW-4B were each installed with an 11-inch hollow stem <br /> auger,MW-5A&B and MW-6A&B were both installed as nested wells <br /> within one 12-inch hollow stern auger The first 5 feet of each of the <br /> borings were hand-augured <br /> Sort Sampling- The soil samples collected were collected using an 18-inch modified <br /> California split spoon sample <br /> Number of Wells Six Well MW-4A,MW-4B,MW-5A, MW-5B, and MW-6A,MW-6B <br /> (Figure 1) <br /> Boring Depth Well MW-4B 50 5 fbg,MW-6A,MW-6B 75 fbg, and MW-4A,MW-5A, <br /> MW-5B 76 fbg(Attachment B) <br /> Well Elevation Survey The top of casing elevations were surveyed to mean sea level on <br /> January 8, 2000 by Virgil Chavez Land Surveying of Vallejo, California <br /> (Attachment E) <br /> Groundwater Depth: Groundwater was initially encountered at 35 0 fbg in wells MW-4A <br /> MW-4B, MW-5A,and MW-5B Groundwater was initially encountered <br /> at 30 0 fbg in MW-6A and MW-6B (Attachment B) <br /> Sediment Lithology Primarily alternating silt,silty sands, and sand to the total depth explored <br /> of 76 fbg(Attachment B) <br /> Well Materials MW-4A and MW-4B were constructed using four-inch diameter,schedule <br /> 40 PVC well casing and 0 010-inch slotted well screen MW-5A,MW-5 <br /> B and MW-6A, MW-6B were all constructed using two two-tach <br /> diameter, schedule 40 PVC well casings and 0 010-tach slotted well <br /> screen(Attachment B) <br /> Screened Interval- Well MW-4A was screened from 70 0 to 75 0 fbg, and MW4B was <br /> screened from 44 0 to 49 0 fbg MW-5A was screened from 70 0 to 75 0 <br /> fbg, and MW-5B was screened from 44 0 to 49 0 fbg MW-6A was <br /> screened from 68 0 to 73 0 fbg, and MW-6B was screened from 49 0 to <br /> 54 0 fbg(Attachment B) <br /> Well Development The monitoring wells were developed on December 29, 1999 All the wells <br /> will be purged,and sampled by Blaine Tech Services,Inc (Blaine)of San <br /> Jose, California during the first quarter of 2000 The SJCPHS will be <br /> given 48-hour notice before the well is sampled <br /> Groundwater Sampling- Blaine is schedule to collected a groundwater samples during January of <br /> 2000 Cambria will send the results as soon as they are available <br /> Soil Chemical Analyses- Based on Cambna's work plan and field observations, soil samples from <br /> rive toot intervals were selected for chemical analysis The sod samples <br /> were analyzed for <br /> 4 <br />