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Technical Services Group, Inc. 00 JUN 2 P1112: 08 June 23, 2000 Project #1017 Mr. Al Olson San Joaquin County Department of Environmental Health 304 East Weber Stockton, Ca., 95202 RE: Casieilo Estates F, oposecr Wastewater ireatment System Dear Mr. Olson: As a follow up to our telephone conversation relative to the above referenced project, please be advised of the following; As we have outlined in our "Report of Waste Discharge and Project Report" submitted to the Regional Water Quality Control Board and your office, the treatment plant that is being installed is a tertiary plant. Prior to discharge, the treated effluent is being disinfected by the use of ozone for coliform destruction. Upon disinfection, the effluent is then filtered through the use of two (2) multi-media pressure filters. With the use of these filters, the effluent quality from a suspended solids stand point will always be less than 10 mg/I. Likewise, the bio-chemical oxygen demand (BOD) will also be less than 10 mg/I. This tertiary addition to the secondary biological system "polishes" the effluent and precludes the discharge of any occasional carry over of solids from the secondary system into the effluent. Further, with this design concept, which is standard and common practice for tertiary plants, the installation of a "polishing pond" is not required. In our discussions and review of the "Report of Waste Discharge" with the Regional Water Quality Control Board, they agreed with this tertiary concept. However, they stated that since the San Joaquin Department of Environmental Health has a proviso in their regulations that requires a "polishing pond" downstream of a Package Treatment Plant, we will have to obtain a letter from the County stating that they will accept the tertiary filters in lieu of a polishing pond. Hence, we are therefore respectfully requesting that your department provide us with such a letter. Thank you Al for your assistance in this matter and I appreciated your positive comments during our phone conversation. We are under a tight deadline for re-submittal to the Regional Board and would greatly appreciate your response in a few days. Please call me at 530-271-1600 if you have any questions. I will FAX this letter per our discussion with the original in the mail. Si o rs it e , ;;--- • - n an , Sr. 31 Crown Point Circle, Suite C • Grass Valley, California 95945 • Phone 530-271-1600 • Fax 530-271-1840 g 72 -411,7