SITE INFORMATION AND CORRESPONDENCE_FILE 2

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Mr. Russell Chapin 27 April 2009 Chapin Brothers Page 2 of 3 1766 Monte Diablo Avenue, Stockton,CA TPHg and Benzene in MW-1 Chapin Bros. 100000 4/30/1997 SVE on 10000 t MW-1 TPHg MW-1 Benzene CL .L 1000 N 0 •` 1/zsrzooz c GWE on 8/9 0 7 GWE on m c 100 U 10 5/10/2005 6/29/1999 SVE off GWE off 1 ■ Sampling Event Dates Monitoring events just prior to each significant remediation action, starting or stopping, are indicated by enlarged point symbols, date and the specific remedial action taken. The graph exhibits significant contaminant concentration declines in response to active remediation and significant concentration rebound during periods of non- operation of the remediation systems. The EHD believes in view of fairly recent rebound testing, the effect of a suspension of active remediation is predicable and premature, and therefore can not approve of the proposed suspension, which you have already implemented as noted above. By letter dated 17 February 2009, you filed another appeal with the State Water Resources Control Board (SWRCB) for closure consideration for your site. The SWRCB informed you by letter dated 13 April 2009 that your case will be reviewed by the SWRCB. As you have an appeal pending with the SWRCB, the EHD will not direct reinitiation of active groundwater extraction. The Request also notes financial hardship for you to comply with the current corrective actions; the EHD does not have the resources to evaluate a financial justification, such as the Central Valley Regional Water Quality Control Board (CVRWQCB) does. As noted above, this is the second time in recent months that you have gone out of compliance with EHD directives to operate your Suspension and Reduction response Letter 0409.doc