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i <br /> approval to perform the source test was given verbally as long as <br /> a written notice of the start up and procedures was submitted to <br /> SJC;-AQB, which it was, see Appendix E. <br /> W Gasoline range hydrocarbons were known to exist beneath the pump Y <br /> island dispensers and undergound storage tank areas. The tank <br /> excavation and product dispenser areas were overexcavated and the <br /> majority of contaminated soil was removed, aerated, and then used <br /> as compacted engineered fill for the excavations. Pea gravel was <br /> first used to back fill the excavations to the 12 foot depth <br /> followed by the compacted native soil to the surface. On October <br /> 8 and 9, 1990 three vapor extraction wells were install-A into <br /> these excavated areas to the 40 foot depth using 2 inch BCH 40 PVC <br /> with 0.02 inch slot casing for the wells. <br /> +85 1lon. t�, <br /> ^�,so'}"r�7""w <br /> the <br /> �}i'c <br /> se <br /> �� 4upb�r�1G, �99d�tand �at�erst0began <br /> A4 IF A <br /> ash xariNly <br /> s .rs�ir i �snc restarted On <br /> hen <br /> dal e stofihe-4 85 <br /> bal <br /> r <br /> TEST PROCEDURES <br /> The test was to proceed for a duration of one month or until bleak <br /> throu h, which ever occurred first. VW •P3° <br /> !� <br /> < oal tum scrubs, <br /> "ports <br /> ". ,�• rabx. k,r - rSarapwere instal e� at�each weld to a�i�n� sa'�mples, and <br /> vacuum readings, at the influent of the blower for samples and <br /> vacuum monitoring, and at the exhaust of the blower for pressure <br /> and sample monitoring. A sample port was also located on the <br /> exhaust of the charcoal tub scrubs for samples and pressure <br /> monitoring. The exhausts of the tub scrubs were checked on <br /> alternate days for breakthrough using a hand held photoionizing <br /> detector (PID) that had been calibrated with isobutylene as 54 ppm <br /> benzene in air. Once breakthrough occurred as shown by the PID, a <br /> bag sample (tedlar bag) of the charcos.l exhaust was obtained and <br /> the pilot test was terminated. At the start up of the test, <br /> influent samples were obtained from monitor wells P1, P3 and EX <br /> and an effluent sample was obtained from the exhaust of the blower <br /> and analyzed for total Petroleum Hydrocarbons (TPH) as gasoline <br /> and diesel along with Benzene, Toluene, Ethylbenzene and Xylenes <br /> (STEX) using DHS headspace method with FID chromatograph Western <br /> Geo-Engineers (WEGE) . A leak developed in the blower on December <br /> page 8 <br />