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N ., II II .'1 E ' beneath a shop building on the property. It had been reported as being 1 ,000 gallon in capacity. When the site was uncovered on June 13, 1989, it was determined that the tank size was 504 gallons instead of 1 ,000. The original plan to close in place was not implemented since the contractor, JTO, was able to remove the tank intact. A soil sample was taken from beneath the center of the removed tank site bylCanonie, (now Weston, ) environmental laboratory personel , with instructions to test for BTEX, TEPH, chloronated f hydrocarbons; PCB, and ICP-metals. The excavation was filled 4 with pea gravel , covered with concrete, and restored to its ' original condition. The results o f the laboratory analyzes, (included in Exhibit C, ) E revealed that BTEX, TEPH, Cl HC, and PCB 's were all 'below detection limits. However , concentrations of some of the metals exceeded EHDilallowable levels, and additional work was requested; refer to Exhibit 8 for a copy of that letter. The ICAP "short list" - EPA Method 6010 TTLC; (Cadmium`, Chromium, Lead, Nickel „ and Zinc, ) was requested by Mr. Michael Collins of the EHD staff to verify that levels were low enough to allow site closure. As a result of that correspondence, WJH prepared a workplan for ' taking another soil sample from beneath the site of the removed tank utilizing an auger rig with slant-drilling capabilities. A copy of that workplan is attached as Exhibit A. 1 DETAILS OF LATEST INVESTIGATIVE WORK: E ii After approval of the warkplan by the County, and waiting for rig Ei availability, work began on October '?3, using Spectrum Exploration Co. equipment - Van Leonard, driller under the direction of Wm. Hunter , RG. A location had been selected as shown on Figure 1 of the workplan; and because of the thickness of the concrete in the driveway, it'lwas necessary to use an air-powered jack hammer to make a, hole for the drill b i t and anger flights. After preparing the location; the rig set up with the mast at a 45-degree angle as programme6. Drilling commenced at 11:00AM under the supervision 64- Mr. Hunter and Michael ;Collins of the EHD. The E augering assembly consisted of 5 ' lengths of clean, ;. 7 1/4" OD E{ flights. The first 6" to one foot of 'sail was a black, slightly sticky loam;�� from there to bottom sediments consisted of brown to I buff-colored. plastic clay, slightly damp, with a few grains of fine-to medium sand, and occassional small inclusions of E carbonaceous'lplant material . There were no odors or evidence of it staining or contamination. After reaching a drilled depth of 20 feet, an 18" California Modified split-spoon sampler was prepared, which contained 3-6"X2`" clean brass tubes That 2