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In March 1.985 Renown Enterprises commenced residential <br /> development on the property with structure removal and grading <br /> activities. During this site preparation work Renown Enterprises <br /> uncovered hundreds of feet of pipe, containing/spilling liquid <br /> crude oil , and discovered significant quantities of crude oil <br /> contaminated soil . it was at this time that the building <br /> inspector from the City of Tracy required Renown Enterprises to <br /> cease any further development activity on the property and filed <br /> a complaint with the San Joaquin County, Department of <br /> Environmental Health. By letter dated April 18, 198-1), San Joaquin <br /> County referred the matter to Your Offices- <br /> Renown Enterprises retained AEMC to characterize and manage the <br /> contamination existing on the property in accordance with the <br /> requirements of the appropriate regulatory agencies. <br /> Approx,imately 4 acres in the ea5t/SOUtheast portions of the <br /> parcel have been graded level and are apparently free from any <br /> Surface Or Subsurface soil contamination. With few e�,,ceptions all <br /> Structures associated with the oil pumping station have been <br /> demolished and removed. Presently existing on the property are <br /> about 500C) linear feet Of crude oil contaminated piping , <br /> stockpiles of soil (contaminated end clean) and concrete debris, <br /> ( 2 feet of liquid) , a 10-foot square <br /> an 8 +oot-square wooden sump . � <br /> -z feet of mud) , and a -.6-inch <br /> concrete-sided sump (-1 __Plugged <br /> d et�er _�jelk,, A soil investigation was conducted by Terrasearch <br /> 19B5 <br /> Inc. in May 1981 and reported to Renown Enterprises in March <br /> (Attachment No. 2) . <br /> All evidence to date suggests that the contamination existing <br /> onsite is from pumping station activities and is only crude oil . <br /> On April 17, 1985, AEMC collected a heavily contaminated soil <br /> sample to determine if the contamination is from crude oil . AEMC <br /> delivered the sample to Eurek-a-L-L.aboratories, Sacramento, for a. <br /> semi-volatile organic analysis (Method SW 82.70) . Laboratory <br /> I Eureka <br /> results (Attaqbmg�nt__Na_ .:.4 were reviewed by AEMC, <br /> and t.he State Toxic SLkbst.anceE Con-trol Division. it <br /> was concluded that the soil contamination exhibits the <br /> characteristics of crude oil . <br /> Groundwater information for the City of Tracy is provided in <br /> Attachments No. 4 , 5, and 6. A City of Tracy municipal drinking <br /> Water well is located northeast 0+ the property, immediately <br /> across Tracy Blvd. The highest perforation level in the Tidewater <br /> Well is 230 feet within the Tulare Formation. AEMC estimated the <br /> water table to be 8 to 15 feet below ground surface. Attachment <br /> No. 4 indicates the upper aquifer is separated from the Tulare <br /> Formation aquifer by 10 to 160 feet of Corcoran Clay. <br /> On May 22, 1985, AEMC Supervised the drilling and installation of <br /> (2 inch I . D. ) on the property by <br /> groundwater monitoring wells <br /> All Terrain Exploration Drilling and Berlogar Geotechnical <br /> Consultants. AEMC obtained a permit to construct an�J install the <br /> 7. monitoring well-- +rofrj the Sari Joaquin County Local Health <br />