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V,) <br />Technical Services <br />Group, Inc <br />HE:41_11i <br />00 JU 23 MI1:37 <br />06/21/2000 05: 27 530-271-1040 <br />7-H TECHNICAL SVCS PAGE 02 <br />June 23, 2000 Project #1017 <br />Mr. Al Olson <br />San Joaquin County Department of Lnvironmental Health <br />304 East Weber <br />Stockton, Ca, 95202 <br />RE: Castello Estates Proposed Wastewater Treatment System <br />Dear Mr. Olson: <br />As a fallow up to our telephone conversation relative to the above referenced project, please <br />be advised of the following; <br />As we have outlined in our "Report of Waste Discharge and Project Report' submitted to the <br />Regional Water Quality Control Board and your office, the treatment plant that is being <br />installed is a tertiary plant Prior to discharge, the treated effluent is being disinfected by the <br />use of ozone for colifogrn destruction. Upon disinfection, the effluent is then filtered through <br />the use of two (2) multi-media pressure filters. With the use of these filters, the effluent <br />quality from a suspended solids stand point will always be less than 10 mg/i. Likewise, the <br />bio-chemical oxygen demand (BOD) will also be less than 10 rrigA. This tertiary addition to <br />the secondary biological system "polishes" the effluent and precludes the dscharge of any <br />occasional came over of solids from the secondary system into the effluent Further, with this <br />design concept, which is standard and common practice for tertiary plants, the installation of <br />a "polishing pond" is not required. <br />In our ciscussions and review of the "Report of Waste Discharge" with the Regional Water <br />Quality Control Board, they agreed with this tertiary concept However, they stated that since <br />the San Joaquin Department of Environmental Health has a proviso in their regulations that <br />requires a "polishing pond" downstream of a Package Treatment Plant, we will have to obtain <br />a letter from the County stating that they will accept the tertiary filters in lieu of a polishing <br />pond_ Hence, we are therefore respectfully requesting that your department provide us with <br />such a letter. <br />Thank you Al for your assistance in this matter and I appreciated your positere comments <br />during our phone conversation. We are under a tight deadline for re-submittal to the <br />Regional Board and would greatly appreciate your response in a few days_ <br />Please cal me at 530-271-1600 if you have any questions I will FAX this letter per our <br />discussion with the original in the mail, <br />31 Crukrin Pint Circle, Suite C • Grass Valley, California 9545 • Phone 5313-271-1600 • Fax 530-271 -1 840