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440109kil 7-9dutics I= Page 2 <br /> Revised Site Conceptual Model Report <br /> Project No.507.2 <br /> April 3,2008 <br /> Prior to the early 1970's Crandle operated a John Deere facility on this property. In the early <br /> 1970's Quimby purchased the property from Crandle and operated J.M. Equipment which is <br /> an equipment sales and service business. In 1991 the property was transferred from Quimby <br /> to Geo Corp. Apparently the tanks were installed during the time Quimby operated a John <br /> Deer facility and J.M. Equipment continued to operate them until they were removed in the <br /> early 1980s. <br /> ` The work performed to date is summarized below*: <br /> • Early 1980's—Two (500— 1000 gallon) USTs removed. <br /> +•- • July 1995—Monitoring wells MW-1, MW-2 and MW-3 installed at the adjacent 1145 <br /> W. Charter Way parcel. <br /> • July 1996 — Monitoring well MW-8 installed at the adjacent 1145 W. Charter Way <br /> parcel. <br /> • September 1996 — Monitoring well MW-9 installed on subject site for the adjacent <br /> 1145 W. Charter Way parcel. <br /> • April 1999 — Three groundwater monitoring wells installed (MW-4 through MW-6), <br /> two 15' hand borings advanced (SB-1, SB-5), three 31' borings drilled (SB-2, SB-3, <br /> SB-4), one 70' boring advanced (SB-109) at subject site; five monitoring wells at <br /> 1145 W. Charter Way transferred to subject site (the above noted MW-1, MW-2, <br /> MW-3,MW-8 and MW-9). <br /> • September 2000—receptor well survey completed. <br /> • May 2001 — A 25' soil boring installed (SB-6), two shallow 30' monitoring wells <br /> installed (MW-7, MW-10), one deep 80' monitoring well installed(MW-109). <br /> �,., • February 2004- three shallow 30' GeoProbe wells installed(GP-1, GP-2, GP-3). <br /> • March-July 2004—In-situ chemical oxidation pilot test performed at the site. <br /> • June 2006—Three 36' soil borings advanced(SB-7, SB-8, SB-9). <br /> • 1999 to present — quarterly groundwater sounding & sampling of sites monitoring <br /> wells. <br /> • February 2008—Two shallow 30' GeoProbe wells installed (GP-4, and GP-5). <br /> +-- <br /> *Pre 1999 data from Wm.J.Hunter&Associates documentation. <br /> The data compiled during the course of this investigation indicate that the soil and <br /> groundwater were impacted with gasoline range petroleum hydrocarbons. <br /> +� 2.4 ASSESSMENT OF BIPACT <br /> 2.1 Release Documentation <br /> The former USTs were allegedly removed in the early 1980's prior to implementation of the <br /> existing UST regulations. The San Joaquin County Public Health Department/Environmental <br /> Health Division (SJC PHS/EHD) staff completed a "Hazardous Waste Discharge <br /> Notification" form with an issue date of October 21, 1996. They also completed an <br /> �► "Underground Storage Tank Unauthorized Release (Leak)/Contamination Site Report" form <br /> V <br />