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Report of Secondary Investigation 4 Prepared for Barbara Drake,26485 Thornton Rd ,Thornton,CA May 4,1995 Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910 120) The document was reviewed and signed by all Groundwater Technology personnel and subcontractors prior to commencement of work at the site 36 Access Agreements/Permitting Access agreements were procured from the current site owner to allow unlimited access to the property for environmental investigation purposes A dnlling/monitoring well installation permit was obtained from the SJCPHS-EHD In addition, an encroachment permit was obtained from the San Joaquin County Department of Public Works for drilling to the County right-of-way Copies of permits are included in Appendix B 4.0 FIELD ACTIVITIES Field activities were conducted at the site on February 16 and 17, 1995 Field activities consisted of soil coring and sampling, installation of temporary wells to the bonngs,groundwater sampling, and borehole backfilling 41 Soil and Groundwater Sampling Soil and groundwater were sampled at ten bonngs (131 through B10) Ten 2 5-inch diameter bonngs were cored to 15-16 feet below ground surface (BGS) using a hydraulically driven STRATAPROBE direct penetration sampling ng Boring B2 was hand augered due to the presence of overhead lines Soil samples were collected from each boring at 5-foot intervals during drilling, beginning at approximately 5 feet BGS Samples were collected using a 2 5-inch O D split-spoon sampler, lined with three 2-inch-diameter by 6-inch-long brass sample tubes The sampler was driven 18 inches ahead of the augers at each sample point Samples in B2 were collected using a slide hammer sampler with extensions and a 2-inch-diameter by 6-inch-long sampling tip Drilling equipment was steam cleaned between each boring,and sampling equipment was washed between each sampling interval Soil samples were field screened for hydrocarbon vapors using a photo-jonization detector (PID) Soil was logged using the Unified Soil Classification System by a Groundwater Technology field geologist working under the supervision of a California registered geologist (Appendix C) One sample tube from each 5-foot interval was sealed, labeled and placed on ice in an insulated container Groundwater samples were collected from temporary wells installed in the bonngs The temporary wells were constructed of 15 feet of 1 5-inch diameter PVC casing and slotted PVC well screen Samples were collected by lowering a small diameter stainless steel bailer into the casing The bailer was decontaminated between each borehole using a detergent(alconox)/water solution and distilled-water-tnple-nnse process All groundwater samples were submitted for laboratory analysis • 0053EAR RPT ❑C1� GROUNDWATER ❑❑❑ TECHNOLOCY a