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1 2 4 Sensitive Receptor Survey and Domestic Water Well Sampling <br /> ' To further identify domestic water wells in the site vicinity, and to determine if any domestic wells <br /> had been impacted by gasoline hydrocarbons, Ramage Environmental completed an expanded <br /> water well survey and collected water samples from 12 domestic water supply wells <br /> On November 9 and 10, 2000, Ramage Environmental conducted a door-to-door water well <br /> 1 survey Along Raylow Avenue and Mylnar Avenue, information was obtained directly from the <br /> residents Ramage Environmental also conducted a walking tour of the entire site vicinity to <br /> ' search for additional water wells A one-page written notice was delivered to each property within <br /> 1,500 feet of the site, asking for any information on water wells that may be located at these <br /> parcels Approximately 300 notices were delivered <br /> By interviewing residents, Ramage Environmental identified a total of 56 domestic water wells <br /> ' along Raylow Avenue and Mylnar Avenue, between East Yosemite Avenue to the south and North <br /> Street to the north A water well exists on every parcel within this area, except for the residence at <br /> 150 Mylnar Avenue Of the 56 parcels with water wells, only 12 are also connected to city service <br /> ! Of the 56 domestic water wells 12 are located within <br /> 500 feet of the site Between September 12, <br /> and November 11, 2000, a water sample was collected from each of these 12 wells From the on- <br /> site domestic well, a groundwater sample was collected using a small diameter bailer All of the <br /> other residential domestic water well samples were collected from hose bibs after allowing the <br /> ' water to run for at least 15 minutes Concentrations of gasoline compounds were not detected in <br /> any of the domestic wells sampled <br /> ' 1 2 5 Monitoring Well Installations and Cone Penetration Testing <br /> To evaluate the horizontal and vertical extent of impacted soil and groundwater, and to establish a <br /> groundwater table monitoring capability at the site, cone penetration testing (CPT) and discrete <br /> ' soil and groundwater sampling were conducted at four on-site locations, and four on-site <br /> groundwater table monitoring wells were installed (Figure 2) <br /> Soils encountered during drilling consisted of discontinuous sand and silty sand intervals <br /> interbedded with finer-grained soils to a depth of approximately 65 feet Between 65 and 90 feet, <br /> more massive sand and gravel intervals were observed across the site Permeable groundwater- <br /> bearing intervals beneath the groundwater table were identified and sampled at approximately 58 <br /> feet, 66 feet, and 78 feet <br />