The Regional Gang Unit on Wednesday announced the arrest of a suspect in 210 graffiti cases that caused an estimated $25,634.70 in damage and clean up costs.  38-year-old Tyler Miner Mathers was booked on a felony graffiti charge on June 18.  Most of the graffiti was in the area of Wells Avenue and Ryland Street but reached as far as Stead, the gang unit said.  Police said Mathers frequently targeted delivery vehicles. The Graffiti Enforcement Team cleaned or painted over graffiti on property.  The gang unit asked people to report graffiti through Secret Witness at 322-4900.