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t3ARTI"ItLY MONrrf)RING I0'.1-01t"I'"Il1R1) 11ARTER OF 1991 ']'racy 13nulevaa.d Shell 3725 Tracy lluulcvard,Tray,('Ialiroratia Shcll WIC No.204.78844M1 I)clta Project No.40-89-012 i'agc 2 o Proposed mark Plat for Prerank Closure Site Assessrreni9Della,June 19, 1999- • Pretank Closure Site Assessment,Delta,November 22, 89. • Preliminary Report Re ort and Tank Closure Report,Delta,November 28, 1990, • Quarterly Monitoring Report, Faurtlt Quarter c r 1990,Delta,February 7,1991- • Quarterly Monitoring Report, first Quarter of 1991, Delta,April 17, 1991. • Quarterly Monitoring Reporr,Secomi Quarter of 1991, Delta,July 25, 1991- 2.2 Mollilorin_l,1'Weils ter of the e 10 Monitoring wells MW-1,IvIVI'2,and MW 3 were drilled laced with mo itoing ells MWc1A,MW ZAl and a depth of 22 feet. These wells were abandon:d p MW-3A on August 16, 1'390. The new wells w were installed adjacent to the abandoned well locations (Figure 2). 3.ti RCSIII:TS OF 1NVIs.S7'1CAT1O1�1 ACTIVITIES 3.1 Crnund Water Flevution 31atalMW-IA, MW-2A, and MW 3A an Depths to ground water were measured at monitoring wels elevation data August 20,1991. Ground water elevations are summarised in Table meter co ng g map w round c�epared and is collected during the August 20, 1991,sampling event, a ground presented in Figure 3. The ;*round water flow direction was toward the north-northeast at a hydraulic gradient of approximately 0.002. 3.Z 3round Antes rct'I Results Ground water samples were collected on August 20, 1991,from monitoring wells lytlxJ-lA, MW-2A.and for analysis of benzene, MW-3A and were submitted to a Cslifopetrocrtm hydrocarbons w (TPH)as gasoline- CChemiCaltonalysis ethylbenzene,tend xylenes(BTEX),and total petroleum results were all below laboratory method detection limits for BTEX and TPH a gasoline. Ground water analytical results for samples collected through August 20,199t,are summarized in"Table 2. Certified laboratory reports are presented in Appendix A. Qrylljo Ml.lr)M