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CLEAR A ER G R O U P I_ N C. 2.O FIELD ACTIVI E5 All work was. performed according to . Clearwater's • Well Installation and Groundwater Sampling Protocols and under .the, directives and guidelines established by the PHS/EHD and the Regional Water .Quality Control Board. : . Clearwater Protocols are attached as Appendix A. 2.1. Soil Borehole Drilling and Soil Sampling . Clearwate"s .workplan was approved and permits' ;were obtained from the- PHS/EHD. A safety briefing was conductedwith 'Mitchell Drilling of Rancho Cordova,,California prior to drilling on'Februar� 23, .1995 All personnel reviewed and signed the..Health and Safety Plan at the end,of the briefing .(Appendix B). i Copies of,all permits are attached in Appendix C. Mitchell Drilling used .a CME 75 drill• rig"to-drill three, eight-inch diameter- soil- borings, designated MW=1, MW-2°`and MW-3, to total depths of 30 feet below grade. Groundwater was initially measured during.drilling at .22 to 23 feet.below grade. A two-inch inside diameter continuous core sampler was, used to collect soil samples . from MW-3: Discreet 187. samples were collect d every five feet from soil borings , i 'MW=1 and MW-2 using a California-modified split-spoon,sampler lined with three M two-inch„diameter brass :tubes. Two soil samples from each boring were selected fora laboratory analysis, labeled; documented ona chain-of-custody Jorm, and placed in a cooler for transport to Cirrus-Environmental, Inc., a state-certified laboratory located in Santa-Maria, California. . The soil samples wee analyzed for TPHg and TPHd by EPA.Me'thod 8015 (modified), and BTEX by EPA Method.8020 (modified). Each ;continuous core•sample was retained `fo visual lithologic description by a Clearwater geologist using the Unified. Soil-'Classification`System, 'and for volatile , organic headspace analysis using_a Mini RAE pl�hoto-ionization detector (PID): PID readings are presented on the Soil Boring Log and Well Construction Diagrams in -Appendix C. Soil cuttings generated from drilling were wrapped in plastic and stored on-site, pending future removal.' 2:2 Monitoring Well Installation; Developmen r.and Survey On-February 23, 1995, soil borings, MW-1, MW-2 and MW-3 were converted into two=inch•diameter•monitoring wells.with the same designations: Well locations are shown on Figure 2. The new monitoring wells were developed by a combination,of surging and bailing on February 28,.1995. . The elevations of the,top-of-casing of all, "t vin wells were then surveyed relative t© a tern -ovary Benchmark. monitoring g Y p D-104 SWI' , 2 May 1, 1995'