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<br />32. <br /> <br />ATTACHMENT A <br /> <br />AUTHORIZATION OF CHANGE IN SERVICES <br />CITY OF SAN MARCOS, TEXAS <br /> <br />PROJECT: <br />ENGINEER: <br />AUTHORIZATION NO.: <br />DATE: <br /> <br />Wastewater Treatment Plant Expansion Project <br />Black & Veatch <br />2 <br />9/9/99 <br /> <br />WORK TO BE ADDED TO OR DELETED FROM SCOPE OF SERVICES <br /> <br />BACKGROUND <br /> <br />Task 1 deals with the plant's influent wastewater characteristics. The plant expansion was based <br />on maximum month total suspended solids (TSS) of 13,590 pounds per day (ppd). Recent records <br />indicate that the plant is receiving an average TSS loading of approximately 7,473 ppd. Others have <br />expressed concerns that these loadings are significantly higher than projected for this same period <br />ohime. Our objective is to evaluate the existing plant influent and determine if the characteristics <br />have changed since the design period. <br /> <br />Task 2 deals with the apparent impact the "iron salt" being fed at the plant has on the performance <br />and capacity of the solids handling facility. This effort will evaluate the use of aluminum sulfate in <br />lieu of "iron salt" in removing phosphorus. This evaluation will also address the effects of the other <br />chemicals with respect to flocculation and sludge production. <br /> <br />WORK TO BE PERFORMED <br /> <br />Task 1 - Sampling and Analysis Program <br />Task 1.1 Raw Wastewater Analysis <br />In order to develop additional data concerning wastewater characteristics, 24-hour composite <br />samples will be collected at the headworks facility for a period of 7 days. The samples will be <br />collected by plant staff and analyzed by a private laboratory. Specific parameters will include: <br /> <br />1. pH <br />2. Total Solids <br />3. Total Volatile Solids <br />4. Total Suspended Solids <br />