SITE INFORMATION AND CORRESPONDENCE

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Ms. Frances Schmiedt, et. al. 2 3 October 2002 Section 4 of the Work Plan lists the analytical methods for samples. The last bullet labeled "Semi-Volatile Organic Compounds by EPA Method 8260 B" should be changed to read "Semi- Volatile Organic Compounds by EPA Method 8270 C." Under Section 7 of the Work Plan, soil cuttings and purged groundwater will be placed in 55-gallon drums and left on site. A label should be placed on the drums that states the location(s) from which the material was derived from and the date collected. Proper sampling and disposal of cuttings should be conducted in accordance with appropriate regulations regarding solid and hazardous waste. Appendix A Section 4.2 titled "Groundwater Sampling" identifies that samples for metals analyses are usually filtered in the field at the time of collection. Given the use of drinking water wells in the area to supply potable water for the residents of Manteca, metals analyses should include total metals analyses on unfiltered samples to be representative samples for evaluation in the risk assessment that will be prepared for the site. The responsible parties still have not submitted a letter stating their intent to implement the proposed investigative activities. If we do not receive such a letter from a responsible party by 18 October 2002, Regional Board staff will recommend a Cleanup and Abatement Order be issued to all potentially responsible parties. We concur with the Work Plan and Addendum provided that the above comments are incorporated into the field work and a schedule of the proposed investigation activities and investigation report is provided by 18 October 2002. The investigation report must detail field activities, sampling results, historical review, and recommendations for additional investigative activities. DTSC will evaluate site conditions to determine the potential to affect public health and the environment and decide on future actions. Therefore, please submit copies of all reports and correspondence to Mr. Tim Miles at DTSC to assist in this evaluation. If you have any questions regarding the DTSC's involvement, you may contact Mr. Miles at (916) 255-3710 or by email at tmiles@dtsc.ca.gov or Ms. Devra Lewis at (916) 255-3119 or lewisd@rb5s.swrcb.ca.gov. L (At, WENDY L. COHEN, P.E. Chief, Private Sites Cleanup Unit cc: Ms. Megan Cambridge, Department of Toxic Substances Control, Sacramento Mr. Tim Miles, Department of Toxic Substances Control, Sacramento San Joaquin County Environmental Health Department, Stockton Mr. Joe Wells, City of Manteca Public Works, Manteca Mr. Mike Atherton, Atherton Homes, Manteca Mr. Robert Martin, Kleinfelder, Stockton Ms. Malma M. Nicholson, Stockton