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CLEAKWkT--ER G R 0 1, P • Envirnnmentaf Services Certification This report was prepared under the supervision of a professional Registered Geologist in the state of California All statements, conclusions and recommendations are based solely upon published results from previous consultants, field observations by Clearwater Group and laboratory analysis performed by a California DHS-certified laboratory related to the work performed by Clearwater Group Information and interpretation presented herein are for the sole use of the client and regulating agency The information and interpretation contained in this document should not be relied upon by a third party The service performed by Clearwater Group, Inc has been conducted in a manner consistent with the level of care and skill ordinarily exercised by members of our profession currently practicing under similar conditions in the area of the site No other warranty, expressed or implied, is made Sincerely, Clearwater Group ��© 10�®� 5 `4 L � +�ja 4/3a1U3 'lJ Brian Gwumn, R G ' .;: Chief Geologist Attachments Site Location Map (Figure 1) Site Plan (Figure 2) Groundwater Elevation Map -4/2/01 (Figure 3) Residual Dissolved-Phase Contamination Map - 4/2/01 (Figure 4) MW-1 TPHg, Benzene, and MTBE vs Time (Since Remediation Initiated) (Figure 5a) MW-2 TPHg, Benzene, and MTBE vs Time (Since Remediation Initiated) (Figure 5b) Well Constructions Specifications (Table 1) Groundwater Elevations and Water Sample Analytical Data (Table 2) Clearwater's Field Protocols Clearwater Well Gauging Data/Purge Calculations and Well Purging Data Laboratory Reports and Chain-of-Custody Forms cc Stella Ruiz, Ruiz Grocery, 4491 West Durham Ferry Rd, Tracy, CA 95376 Marty Hartzell, CVRWQCB, 3443 Routier Rd , Ste A, Sacramento, CA 95827 ZB107C GWMR 2Q01 6 April 9, 2UD1