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6 0 <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY r` <br /> ENVIRONMENTAL HEALTH DIVISION " ' ` <br /> Karen Furst, M.D., M.P.H., Health Officer E L E COPY <br /> ..�, P.. <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 9520 <br /> 209/468-3420 <br /> RAYMOND GREER <br /> RAYMOND GREER CONSTRUCTION 0 E C 2 f 1908 <br /> 1111 1ST ST <br /> ESCALON CA 95320 <br /> Re: RAYMOND GREER CONSTRUCTION Site Code: 2021 <br /> 15634 STEINEGUL RD <br /> ESCALON CA 95320 <br /> This letter is to document adjustments to the work plan dated July 23, 1997 prepared <br /> by WHF, Inc. that were made at the recommendation of San Joaquin County Public <br /> Health Services, Environmental Health Division (PHS/EHD) staff at the above <br /> referenced site on August 8, 1998. The soil had petroleum odor and Photo-ionization <br /> detector (PID) indicated the presence of hydrocarbon contamination in the soil as deep <br /> as 90 feet below surface grade (bsg) during the installation of monitoring well (MW) #2. <br /> After discussion with the geologist from BSK & Associates, the following adjustments <br /> to the work plan were made in order to maximize the effectiveness of the investigative <br /> work: <br /> 1) The screen length of each well was increased to 20 feet and the screen was set at 70 <br /> to 90 feet bsg. Groundwater was first encountered at about 82 to 85 feet bsg during <br /> well construction, but static water is at approximately 73 feet bsg. <br /> 2) Boring#2 (B-2) was advanced to 100 feet bsg in order to define the vertical extent of <br /> the contamination. Soil samples were collected from the vadose zone, the capillary <br /> fringe, and the water bearing zone. <br /> 3) A water sample from the domestic well was collected for laboratory analyses due to <br /> its close proximity to the contamination source and the strong odor noted in MW- <br /> 1. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Jeffrey Wong , REHS Margara Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: CRWQCB, Central Valley Region -Mark List <br /> c: BSK & Associates -John C. Pfeiffer <br /> A Division of San Joaquin Counry Heakh Care Services <br />