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Brusca Project No. 137-002 <br /> <br />Page 2 <br />July 17, 2017 <br />Murphy Parkway Property Sampling Results <br /> <br />DRILLING AND SAMPLING ACTIVITIES <br /> <br />As required, a drilling permit for the exploratory borings was obtained from the San Joaquin <br />County Environmental Health Department (SJCEHD). A copy of the approved permit is <br />attached. Prior to the drilling and sampling at the site, we marked the locations of planned <br />borings and we contacted Underground Service Alert to clear the borings of underground <br />utilities. <br /> <br />Exploratory drilling and sampling were performed at the site on April 26, 2017. Five direct push <br />borings (identified as B1 through B5) were performed by a C57-licensed drilling contractor at <br />spatially-distributed locations on the property. Surface soil sampling was performed at four <br />additional locations on the property (identified as S1 through S4). The drilling and soil sampling <br />locations are shown on Plate 2. All field exploration and sampling was performed in accord with <br />standard environmental protocol and was directly overseen by a Professional Geologist from our <br />office. <br /> <br />Representative soil samples were collected from the surface at each boring, from various depths <br />within the borings, and from the surface soil sampling locations S1 through S4. Surface soil <br />samples were collected within laboratory-provided glass jars, and the deeper samples from the <br />borings were retrieved in plastic sleeves and sealed with Teflon tape and plastic end caps. <br /> <br />Each of the exploratory borings engaged groundwater; stabilized groundwater depths within the <br />boreholes ranged from about nine to 13 feet. Following drilling, a ¾-inch PVC temporary well <br />was installed in each borehole. Groundwater samples were obtained from each temporary well <br />via peristaltic pump and transferred to laboratory-provided containers appropriate for the planned <br />analyses. <br /> <br />All soil and groundwater samples were assigned unique identification numbers, labeled, <br />immediately placed on ice, and transported under chain-of-custody documentation to State- <br />certified laboratory for analysis. <br /> <br />Following the drilling and sampling activities, the temporary PVC wells were removed from the <br />boreholes and direct push borings were backfilled with neat cement grout in accord with SJCEHD <br />requirements. <br /> <br /> <br />LABORATORY TESTING <br /> <br />Soil samples collected from the site were submitted to a State-certified laboratory (Sunstar <br />Laboratories, Inc.; ELAP No. 2250) for analysis. The soil samples were analyzed for one or <br />more of the following: gasoline-, diesel-, and motor oil-range petroleum hydrocarbons by EPA <br />Method 8015C; volatile organic compounds (VOCs) by EPA Method 8260B; polychlorinated <br />biphenyls (PCBs) by EPA Method 8082; organochlorine pesticides by EPA Method 8081A; and <br />CAM17 metals by EPA 6010B. Groundwater samples submitted to Sunstar Laboratories were <br />analyzed for petroleum hydrocarbons, VOCs, organochlorine pesticides, and CAM 17 metals by <br />the EPA methods cited above; these samples also were analyzed for nitrates (as NO3) by EPA <br />Method 300.0 and total dissolved solids (TDS). Additionally, the groundwater samples collected