SITE INFORMATION AND CORRESPONDENCE

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s � ' "wool PUBLIC HEALTH SERVICES SAN JOAQUIN COUNTY r z fOGI KHANNA M.D..AP.H. Health Officer P.O. Box 2009 • (1601 Fist l=lton Avenue) 0 Stockton, California 95201 (209) 468-3400 r ROD NELSON LAIDLAW CORPORATION 1444 TILLIE LEWIS ^- 2 2 � 9 STOCKTON CA 95206 RE: 1444 Tillie Lewis SITE CODE: 2454 Stockton, Ca San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed the review of the Quarterly Report for the third quarter of 1993 and has the following comments. The 1991 over-excavation of the former tank cavity has removed the bulk of the contaminated unsaturated soils at this site. However, the contaminated saturated soils and groundwater remaining at the site still need to be addressed. As the full extent of the groundwater contaminant plume has been determined and pursuant to Title 23, Chapter 16, Article 11, Section 2725(c) of the Corrective Action Regulations (enclosed for your information), a Corrective Action Pian (CAP) must be submitted to PHS/EHD for review and concurrence. Section 2725(d)(e)(f)(g) describes various specific elements and objectives that should be included in the CAP. Section 2725(1) requires the responsible party to identify and evaluate at least two alternatives for restoring or protecting the groundwater to background levels or to levels that do not negatively impact the beneficial uses designated by the State for the groundwater. The State Water Resources Control Board (SWRCB) and the Central Valley Regional Water Quality Control Board (CVRWQCB) have determined standards for water quality for the State and for the Central Valley Region. The CVRWQCB has established a Basin Plan for groundwater in this area which lists the beneficial uses as municipal and domestic supply, agricultural supply, and industrial supply. In 1968, the SWRCB passed Resolution 68-16, seeking to maintain a high quality of water in 'the State. This resolution requires dischargers, if technically feasible, to restore impacted waters of the State to original background levels. Should this goal be technologically infeasible or economically unrealistic, the discharger may propose to restore the impacted waters of the State to standards established to protect the beneficial uses designated for the water. Enclosed for your information is a CVRWQCB Staff Report discussing water quality goals for this specific area. This document may be helpful in establishing appropriate cleanup levels for this site as required in the Corrective Action Regulations. in addition to the evaluation of the two cleanup alternatives required for the CAP, you may also evaluate passive groundwater monitoring as an alternative. However, this alternative must also be evaluated for effectiveness in restoring the groundwater to background levels and for total cost. This A DMmon of San Joaquin County Hdlth!7-3re services